Re: [Emc-users] ot: voltage and steppers
It might be too obvious to point out but I would feel the need to ask about the current output capability of the 24 and 36 volt supplies or batteries. A 36 volt supply that can't output the motor's rated current is not going to turn the motor as well as a 12 volt supply with ample current capacity. That question should be answered before the supply was even considered. Cecil -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 2.6.4 to 2.6.7 update without a network connection?
On 03/28/2015 04:43 PM, andy pugh wrote: On 28 March 2015 at 21:44, Gregg Eshelman g_ala...@yahoo.com wrote: Where do I download the update from 2.6.4 to 2.6.7 to sneakernet to a PC with the Debian Wheezy LCNC install? http://buildbot.linuxcnc.org/dists/wheezy/2.6-rt/binary-i386/ That link has the interim builds of the 2.6 stable branch. Actual releases are here: http://linuxcnc.org/dists/wheezy/2.6/binary-i386/ -- Sebastian Kuzminsky -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On Sunday 29 March 2015 15:50:39 Cecil Thomas wrote: It might be too obvious to point out but I would feel the need to ask about the current output capability of the 24 and 36 volt supplies or batteries. A 36 volt supply that can't output the motor's rated current is not going to turn the motor as well as a 12 volt supply with ample current capacity. This is true, but if the supply was loaded that far beyond its capabilities, I'd also expect it to release its magic smoke well before the times the OP said he had tested it. Even if he was using a triplet of 916 batteries, to get his 36 volts they would have to be pretty well used to fail as bad as he claimed without failing with smoke sound effects. Fresh ones loaded that heavy would probably have smoked in a minute or less. This is a case of having lots of info presented, 90% of which is not being backed up by a clarifying reply. At this point, I am wondering if English is not the OP's first language. That question should be answered before the supply was even considered. Cecil -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Not ACME, ballscrews! Re: Anyone have leftovers from a 9x20 CNC conversion?
I have a left over ball screw but do not know the price for these, It is around 2.5 metres long and I bought it used for below $100 On Sat, 28 Mar 2015 23:52:59 -0600 Gregg Eshelman g_ala...@yahoo.com wrote: On 3/28/2015 8:46 AM, Gene Heskett wrote: I need to be finding some good ACME rod for the 9x20 CNC, motors etc. Scratch the ACME. Today I snagged a homebuilt XY table to cannibalize for parts. http://boise.craigslist.org/art/4894831991.html Across the gantry it has a 0.37-ish rolled ballscrew with a nut threaded on one end, with a max OD of .247 I have the saddle channel plowed out to nearly that, can easily go the extra few thou to have it just clearing. Will run a big ballnose down the center if it needs to be lower down. Of course that screw will need shortened a bunch. I plan to give it as much cross slide travel as I can. The other axis is a vintage Star ballscrew linear actuator made in 1997, inside a 2x2 aluminum extrusion with a block on one side. I'll mount that to the side of the bed with the block down (keep the chips out of the open side) and make a dead simple bracket to mount from the side of the block to the original apron mounting holes on the saddle. And it has motors, bleeping expensive Superior Electric Slo-Syn 200 step steppers. A NEMA 34 connected to the Star actuator direct drive with a Lovejoy and a NEMA 23 with a belt drive to the other axis. The builder for some reason put the large pulley on the motor. The table is HEAVY, made of nicely put together wood. It shall become the new seat upon which my PLM2000 mill will set, after removal of everything screwed down to its top. It looks deceptively weedy in the photos but it's around 4 feet tall. Took three people to get it into the truck and we had to tilt it up on one edge then down onto the tailgate to lift and slide it in. Cost? $300 cash money. :) Some of the other parts may migrate their way into a 3D printer I'm wanting to build. Need to do something with the 30 feet of 40x40mm aluminum t-slot extrusion and various corner plates and angle brackets I've been given. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Smart little device for zeroing
On Saturday 28 March 2015 23:53:53 Scott Salrin wrote: Thanks again for the words of encouragement the other day, guys. I've been thinking, which has always been dangerous for me. I need to bounce my thoughts off of some smart people, to set me straight. First let be beg forgiveness if this is inappropriate, or if I pull this thread off topic... It seemed dead anyway. As I mentioned, I have not received the machine yet, so all of this is theory at this point. The router is a Probotix Nebula, and will come ready to make chips out of the crate, but I have a lot to learn in preparation and trying to figure it out on my own is starting to hurt. I am having a tool length switch installed and it will come configured with a tool changing routine. The routine is called by a o100 command. I am also having a 4th axis rotary installed. This is where I am confusing myself. I haven't purchased the cam yet, but do believe it will be vectric aspire. This means the the rotary work will have to be wrapped around I believe the x axis, in this case, at the post processor. I also want to use the makers guide featured in the attached video, foe most of my work, and will need to pull off all the custom buttons and code to make that happen. Am I correct in thinking that all the coding I'll need to do will be in absolute co-ordinates, and not affected by the gcode that is wrapped around the x axis. Like if I set the rotary to be say a G55 work co-ordinate, and run a wrapped gcode file that has tool changes in it, when a tool change routine is called the machine will go to the tool change position, wait for me, do the routine and go back to G55 and start running the wrapped code again? Or, is it going to sit there after the new tool length offset and spin the A axis instead of travelling back the the work offset origin? Here is a link to the code Probotix uses: http://www.probotix.com/wiki/index.php/Automatic_Tool_Length_Sensor That page, after I hit ctl+ enough times to make it readable, contains one statement right at the top that with linuxcnc, is not true, and represents that each tools operations have to be in a separate file. With the use of different co-ordinate systems, the splitting of files, such as an eagle drill file where many different drill sizes are used, the auto tool length subroutine is inserted as a wrapper around the M6 T# issued eac h time its found in the generated file, doing the tool length measurements and correcting the co-ordinate system used for the next drilling operations. To use eagle as the gcode source via pcb-gcode, I have written tedautoz.ngc for top of board operations, and bedautoz.ngc for bottom of the board operations. I am changing tool/drills manually on my toy mill but these routines handle the rest of it. Once the pallet co-ordinates are known, and tholefinder.ngc has located a small brass pipe inserted into one corner of the pallet and connected to the G38.2 probing pin of the parport, has located the center of that pipe, then the rest of the code consists of inserting the xy offsets into a g55 system for top operations, and a G56 system for bottom operations. Net result is that while the jig shown in a recent video link is purty, I didn't have to make one since its placement looks like an error source to me. So I measure a pipe glued into the pallet for x/y zeroing and measure the pcb itself for the z zeroing. I can drill to -0.033 thru the FR-4 with a .0315 drill, turn the board over and run the bottom drills to that same depth, getting one hole with virtually no offset errors where the two drill operations meet in the middle of the pcb's thickness. You can get those 3 routines from my web page in the sig, in: Genes-os9-stf/LCNC and use them as templates to write your own, or just edit them to suit your tools. My tholefinder.ngc expects a different tool in the form of a sewing needle threader wire soldered into the end of a 1/8 brass pipe from the hobby shop, and reformed a bit into a sharp pointed profile, bent to center it as well as you can, and is used by running the spindle slowly, about 300 rpms. Then it descends until first contact is detected, backs up to clear that initial contact, then begins the xy search, recording each contact, does the math to find the exact center of each direction, records it in the coordinate system to be used, then backs up to a good height allowing it to be extracted and the first tool mounted. Repeatable accuracy in my toy mill is generally less than a thousandth with this method. One thing I had to do because that contact is fleeting, was to add a ten uf tantalum capacitor to the G38.2 probe detector line, effectively prolonging the contact long enough for LCNC to reliably detect it. The probe in the form of that wire, becomes a perfect cone of wire because its rotating. And it can, if you forget to connect the probe cable to it, be bent and
Re: [Emc-users] Smart little device for zeroing
On 29 March 2015 at 04:53, Scott Salrin scott.sal...@gmail.com wrote: Here is a link to the code Probotix uses: http://www.probotix.com/wiki/index.php/Automatic_Tool_Length_Sensor Their approach to tool-length sensing is to replace the M6 tool change command with a call to a subroutine which probes the tool length and then issues the tool-change command. Basically it adds moves and a probe before and after the M6 command. In the newer versions of LinuxCNC you can re-define the behaviour of M6, so you can in fact leave your G-code using M6 for tool-change and the effect will actually be to call the 100.ngc subroutine. (The M6 in the re-mapped subroutine is interpreted as a normal M6, the subroutine doesn't keep recursively calling itself) This would be the minimal remap described in section 5.6 here: http://www.linuxcnc.org/docs/html/remap/structure.html#_making_minimal_changes_to_the_built_in_codes_including_tt_m6_tt However, the Probotix post-processor for Vectric is set up to use the O100 CALL rather than M6, so if you are using that postprocessor things should work without the remap process. As for whether the tool-change macro will lead to frantic spinning of the A axis rather than X movement, that rather depends on how the 4th-axis work is configured. If it is an alternative machine config which has the A-axis stepper driven by the G-code X-word then I rather suspect that it would. But there are other ways that it might be done. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Teleop and soft limits
How to properly setup machine, that soft limits wouldn't be ignored when jog in teleop (world mode)? -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cleaning machinery
If the machine is covered with water soluble coolant residue then soap and water will clean it easier than petroleum products. I usually try hot/warm soap and water first. Purple Power is amazing also. On Sat, Mar 28, 2015 at 9:22 PM, Dave Cole linuxcncro...@gmail.com wrote: Scrape off all you can of the heavy stuff. http://www.ehow.com/way_5434198_homemade-engine-degreaser.html The kerosene mix works very well on heavy grease. Spray it on, let it sit, brush and wipe it off, repeat. Dawn dishwashing soap works well with kerosense. Buy big bottles of it from Sam's/Costco etc. It works best when things are warm of course. Aim a space heater at the machine for a while and get it up to 80-90 degrees then spray it on and things will go much faster. I've used that solution for years to clean up dirty engines.A cheap pump up tank sprayer such as used for weeds etc works fine. Dave On 3/28/2015 7:42 PM, richsh...@comcast.net wrote: I just bought a 1975 vintage Anayak FV2 mill, imported to the US by DoAll. It has so much grease, muck, and yuck on it, I need to clean it. So far I've tried citrus based solvent, paint thinner, automotive, parts cleaner.. Applying it via green and brown scotch brite pads. Any suggestions on a degrease process? - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Saturday, March 28, 2015 2:44:22 PM Subject: Emc-users Digest, Vol 107, Issue 78 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Possible New Lathe (richsh...@comcast.net) 2. ot: voltage and steppers (kqt4a...@gmail.com) 3. Re: ot: voltage and steppers (Dave Cole) 4. Re: ot: voltage and steppers (kqt4a...@gmail.com) 5. 2.6.4 to 2.6.7 update without a network connection? (Gregg Eshelman) -- Message: 1 Date: Sat, 28 Mar 2015 15:24:42 + (UTC) From: richsh...@comcast.net Subject: Re: [Emc-users] Possible New Lathe To: emc-users@lists.sourceforge.net Message-ID: 1991675046.16595850.1427556282912.javamail.zim...@comcast.net Content-Type: text/plain; charset=utf-8 Boris? Obviously, an oversize Van Norman vertical mill, I'd say 7,000 lbs or so. - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Friday, March 27, 2015 11:45:16 PM Subject: Emc-users Digest, Vol 107, Issue 76 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Converting straight lines to arcs? (andy pugh) 2. Re: Tsudakoma TRNC-201S on a bridgeport Interact Series II? Crazy? (Gregg Eshelman) 3. Re: Possible New Lathe (Gregg Eshelman) 4. Anyone have leftovers from a 9x20 CNC conversion? (Gregg Eshelman) 5. Re: Possible New Lathe (Gregg Eshelman) 6. Re: Velocity closed loop + Position losed loop on an axis (Jon Elson) 7. Re: Velocity closed loop + Position losed loop on an axis (Karlsson Wang) -- Message: 1 Date: Sat, 28 Mar 2015 00:36:39 + From: andy pugh bodge...@gmail.com Subject: Re: [Emc-users] Converting straight lines to arcs? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: CAN1+YZVdhS=mnazvq02zh_qyjpfjslncriremqhknmhhrdx...@mail.gmail.com Content-Type: text/plain; charset=UTF-8 On 28 March 2015 at 00:13, Gregg Eshelman g_ala...@yahoo.com wrote: Will it allow saving/exporting the modified G-code file? It looks like that is _all_ it allows. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought
Re: [Emc-users] ot: voltage and steppers
On Sunday 29 March 2015 07:13:54 kqt4a...@gmail.com wrote: [...] Locally, Lowes sells them for about $35. No IR thermometer I ran the motor on 12 volts for about 1 hour and the chip was only barely warm to touch Then I ran the motor on 36 volts for about 1 hour and the chip was only barely warm to touch The 36 volt power supply is close in the same container so I disconnected it and ran the motor on batteries Same results the motor is very weak I wasn't referring to the chip temps, I was more interested in the motors temp, which being a relatively massive item to heat, taking a boring amount of time to reach a stable operating temp, a temp thats quite likely to be too hot to touch comfortably. But either you didn't notice because it wasn't getting too hot., or didn't feel it for heat. They will run hot, uncomfortably hot in normal operation. And contrary to what somneone else said, the driver components will actually run cooler at the higher voltages because most of them are hexfets with on resistances measured in milliohms and at the high voltages spend less time in the on state to reach the regulated current point at the higher voltages, they will actually run cooler as the voltage rises, up to the rated voltage. Because of the higher on time at lower voltages, the 2M542 driver is not recommended to be run on less than 24 volts. This is a 50 volt rated, max of 4.2 amps driver available on fleabay, for less than $50 a copy. When I fried the 3rd xylotex, I bought 7 of them, 3+ years ago, 2 for my lathe and 4 for the mill since it can also have a rotary table. The 7nth one has now been used as a test mule, set for a /8 stepping, driving a 425 oz/in triple stack nema 23 motor at speeds up to 3000 rpms on a 47 volt supply, long enough to prove it can do it. The motor gets hot, but the driver is running maybe 5 degrees above ambient, at 1/2 its max amps rated output as the test motor is an 8 wire, wired in series. You haven't said, other than you built them yourself, what your driver is, so we are all in the dark trying to read between the lines. Perhaps you can supply a link to where you obtained the schematic for it? I am a CET, and perhaps might be able to see why its not working as advertised. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On 29 March 2015 at 16:41, Gene Heskett ghesk...@wdtv.com wrote: You haven't said, other than you built them yourself, what your driver is, so we are all in the dark trying to read between the lines. He said that they were these: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cleaning machinery
Try to remove what can be removed mechanically with a scraper etc. Then I use strong anionic detergents like in household baking oven cleaner or motorcycle spray, letting them soak in for an hour or so, reapplying wehre drops have run down or drying shows. Only the very last traces are left for organic solvents. I used to know a shop where used machinery was cleaned up and made ready for re-selling. They had an ordinary hand held high pressure gun, but instead of hot water supplied with hot heating oil (or kerosene, if you like), the machines being supported on gratings above a car washing pit. There is no dirt that can withstand that. Afterwards, to remove the oil, washing with detergents and hot air drying followed. After all this the machines were ready to be sprayed with new paint. Peter Am 29.03.2015 01:42, schrieb richsh...@comcast.net: I just bought a 1975 vintage Anayak FV2 mill, imported to the US by DoAll. It has so much grease, muck, and yuck on it, I need to clean it. So far I've tried citrus based solvent, paint thinner, automotive, parts cleaner.. Applying it via green and brown scotch brite pads. Any suggestions on a degrease process? - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Saturday, March 28, 2015 2:44:22 PM Subject: Emc-users Digest, Vol 107, Issue 78 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Possible New Lathe (richsh...@comcast.net) 2. ot: voltage and steppers (kqt4a...@gmail.com) 3. Re: ot: voltage and steppers (Dave Cole) 4. Re: ot: voltage and steppers (kqt4a...@gmail.com) 5. 2.6.4 to 2.6.7 update without a network connection? (Gregg Eshelman) -- Message: 1 Date: Sat, 28 Mar 2015 15:24:42 + (UTC) From: richsh...@comcast.net Subject: Re: [Emc-users] Possible New Lathe To: emc-users@lists.sourceforge.net Message-ID: 1991675046.16595850.1427556282912.javamail.zim...@comcast.net Content-Type: text/plain; charset=utf-8 Boris? Obviously, an oversize Van Norman vertical mill, I'd say 7,000 lbs or so. - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Friday, March 27, 2015 11:45:16 PM Subject: Emc-users Digest, Vol 107, Issue 76 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Converting straight lines to arcs? (andy pugh) 2. Re: Tsudakoma TRNC-201S on a bridgeport Interact Series II? Crazy? (Gregg Eshelman) 3. Re: Possible New Lathe (Gregg Eshelman) 4. Anyone have leftovers from a 9x20 CNC conversion? (Gregg Eshelman) 5. Re: Possible New Lathe (Gregg Eshelman) 6. Re: Velocity closed loop + Position losed loop on an axis (Jon Elson) 7. Re: Velocity closed loop + Position losed loop on an axis (Karlsson Wang) -- Message: 1 Date: Sat, 28 Mar 2015 00:36:39 + From: andy pugh bodge...@gmail.com Subject: Re: [Emc-users] Converting straight lines to arcs? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: CAN1+YZVdhS=mnazvq02zh_qyjpfjslncriremqhknmhhrdx...@mail.gmail.com Content-Type: text/plain; charset=UTF-8 On 28 March 2015 at 00:13, Gregg Eshelman g_ala...@yahoo.com wrote: Will it allow saving/exporting the modified G-code file? It looks like that is _all_ it allows. --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users
Re: [Emc-users] Cleaning machinery
Some times it just needs to be a complete strip so you can remove bad paint and rectify faults. My hobbing machine probably from the 1940s had revolting paint and grime on the outside and a layer 1/2 to 1 thick in the coolant tank which is integral but under the main unit, plus the slide had rusted and I planned on cnc so needed to get inside to see what gearing ratios etc were in it. Cleaning was a white spirit to remove outer grime then wire brush on cast finishes, for joint faces I use a HSS lathe tool but ground as a scraper, not too sharp, great for getting the jointing compound or surface rust off cast iron without the damage a sharp wire brush can inflict. Some surfaces need a fine wet and dry paper(880-1200 grit) to make them pretty again. an example http://www.collection.archivist.info/searchv13.php?searchstr=barber+colman Dave Caroline On 29/03/2015, Peter Blodow p.blo...@dreki.de wrote: Try to remove what can be removed mechanically with a scraper etc. Then I use strong anionic detergents like in household baking oven cleaner or motorcycle spray, letting them soak in for an hour or so, reapplying wehre drops have run down or drying shows. Only the very last traces are left for organic solvents. I used to know a shop where used machinery was cleaned up and made ready for re-selling. They had an ordinary hand held high pressure gun, but instead of hot water supplied with hot heating oil (or kerosene, if you like), the machines being supported on gratings above a car washing pit. There is no dirt that can withstand that. Afterwards, to remove the oil, washing with detergents and hot air drying followed. After all this the machines were ready to be sprayed with new paint. Peter Am 29.03.2015 01:42, schrieb richsh...@comcast.net: I just bought a 1975 vintage Anayak FV2 mill, imported to the US by DoAll. It has so much grease, muck, and yuck on it, I need to clean it. So far I've tried citrus based solvent, paint thinner, automotive, parts cleaner.. Applying it via green and brown scotch brite pads. Any suggestions on a degrease process? - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Saturday, March 28, 2015 2:44:22 PM Subject: Emc-users Digest, Vol 107, Issue 78 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Possible New Lathe (richsh...@comcast.net) 2. ot: voltage and steppers (kqt4a...@gmail.com) 3. Re: ot: voltage and steppers (Dave Cole) 4. Re: ot: voltage and steppers (kqt4a...@gmail.com) 5. 2.6.4 to 2.6.7 update without a network connection? (Gregg Eshelman) -- Message: 1 Date: Sat, 28 Mar 2015 15:24:42 + (UTC) From: richsh...@comcast.net Subject: Re: [Emc-users] Possible New Lathe To: emc-users@lists.sourceforge.net Message-ID: 1991675046.16595850.1427556282912.javamail.zim...@comcast.net Content-Type: text/plain; charset=utf-8 Boris? Obviously, an oversize Van Norman vertical mill, I'd say 7,000 lbs or so. - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Friday, March 27, 2015 11:45:16 PM Subject: Emc-users Digest, Vol 107, Issue 76 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Converting straight lines to arcs? (andy pugh) 2. Re: Tsudakoma TRNC-201S on a bridgeport Interact Series II? Crazy? (Gregg Eshelman) 3. Re: Possible New Lathe (Gregg Eshelman) 4. Anyone have leftovers from a 9x20 CNC conversion? (Gregg Eshelman) 5. Re: Possible New Lathe (Gregg Eshelman) 6. Re: Velocity closed loop + Position losed loop on an axis (Jon Elson) 7. Re: Velocity closed loop + Position losed loop on an axis (Karlsson Wang) -- Message: 1 Date: Sat, 28 Mar 2015 00:36:39 + From: andy pugh bodge...@gmail.com Subject: Re: [Emc-users] Converting straight lines to arcs? To: Enhanced Machine Controller (EMC)
Re: [Emc-users] ot: voltage and steppers
On Sat, 28 Mar 2015, Gene Heskett wrote: On Saturday 28 March 2015 19:36:09 kqt4a...@gmail.com wrote: On Sat, 28 Mar 2015, Bertho Stultiens wrote: On 03/28/2015 08:37 PM, kqt4a...@gmail.com wrote: I have a question about the voltage to drive a stepper motor 12 volts works but higher voltages make the motor weaker I am building a simple stepper driver A nema 23 2.7 amp stepper motor and 36 volt power supply The controls are hand held, forward ,reverse, stop, and speed I built the controls and driver using a 12 volt battery to test Now I completed the project and am using the 36 volt supply The motor runs at the same speed but it is so weak I can hold the shaft and stall the motor This is also the same with 36 and 24 volt batteries With a 12 volt battery I can not stall the motor I am using http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm and an Arduino I would be happy if someone would point out my stupidity The chip uses a constant current setup using PWM. When you raise the supply voltage then the trip-current is reached sooner and recovery may take too long for the next PWM cycle. The datasheet says that the off-time is between 7 and 12 microseconds. Your high voltage level may cause a feed-through on the current-limiter because of the increased rising flank of the current. This decreases the on-time vs off-time and the effective current to the motor is reduced which results in a lower torque. The problem may be in the physical setup, where too much noise is propagated. You should check the wiring and use an oscilloscope to check the signals for spikes etc.. I do not have an oscilloscope You may have to cultivate a friend who does have one. As a scope user myself since 1951, there is no other way to measure things where time vs voltage or amperage needs to be measured. and I don't think noise is the problem I am single and it is usually pretty quiet around here :) The noise being refered to is electrical, not acoustical and steppers, with their built in PWM modulation in a decent driver that does regulate current to maintain the average, is one noisy puppy electrically, which is the sort of noise being referred to. One more question though. After half an hour powered up on 12 volts, how does the motors temp (its gonna be hot, use an IR thermometer) compare with 1/2 hour powered up on 36 volts? If its smell it hot in 10 minutes, pull the plug, your drivers are not regulating the current adequately and the motor is saturated, possibly damaging the rotors magnetism forever If its many degrees cooler, then the driver may be turning itself down to protect the driver. If its smart enough, most of the lower cost drivers aren't. I have let the magic smoke out and broke the mirrors on quite a few allegro A-3977 based drivers. I switched to 2M542's off fleabay about 5 or 6 years back, buying enough to switch them all out with one spare for the parts drawer. Its still there, has not been needed. No IR thermometer I ran the motor on 12 volts for about 1 hour and the chip was only barely warm to touch Then I ran the motor on 36 volts for about 1 hour and the chip was only barely warm to touch The 36 volt power supply is close in the same container so I disconnected it and ran the motor on batteries Same results the motor is very weak On Sun, 29 Mar 2015, Kyle Kerr wrote: You missed the part where Gene suggested you check motor temp not chip temp. :) At both volages the motor was not so hot I could not hold it in my hand for several seconds There has been no smell of anything hot I only added resistors to driver to give 2.3 amps -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On 29 March 2015 at 17:29, Gene Heskett ghesk...@wdtv.com wrote: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm That link opens with a pay alms or go away script, so I can't see it. Strange. It just opens as a web page here. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On Sunday 29 March 2015 12:01:26 andy pugh wrote: On 29 March 2015 at 16:41, Gene Heskett ghesk...@wdtv.com wrote: You haven't said, other than you built them yourself, what your driver is, so we are all in the dark trying to read between the lines. He said that they were these: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm That link opens with a pay alms or go away script, so I can't see it. When will folks learn that if they intend to share, put it on pastebin.ca, it Just Works(TM). Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On 03/28/2015 12:37 PM, kqt4a...@gmail.com wrote: I have a question about the voltage to drive a stepper motor 12 volts works but higher voltages make the motor weaker I am building a simple stepper driver A nema 23 2.7 amp stepper motor and 36 volt power supply The controls are hand held, forward ,reverse, stop, and speed I built the controls and driver using a 12 volt battery to test Now I completed the project and am using the 36 volt supply The motor runs at the same speed but it is so weak I can hold the shaft and stall the motor This is also the same with 36 and 24 volt batteries With a 12 volt battery I can not stall the motor I am using http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm and an Arduino I would be happy if someone would point out my stupidity Richard These come to mind, and may have been mentioned by other replies. The schematic shows a 5 Volt logic power supply. I would check to make sure a full 5 Volts is provided at all times and that the 5 Volt supply and your signal source share the same ground. Do you have a BOB (break out board) on a parallel port or some other signal source. Are the signals buffered or isolated? The driver schematic shows 3.3k pull up resistors which will source 1.5 mA, which would allow using parallel port pins directly (usually have a limit of 3 mA, often more), but might not be especially fast. If the BOB has isolation with opto-isolators, common optos can be quite slow. Insure that the reference voltage (.29V) is at the proper level. The reference is used for half power and shutdown features which could keep the motor from using full power if there is a fault somewhere. I didn't see a callout for current limit resistors for 3 amps, I assume the callout would be .1 Ohms. Oops, the text does talk about setting which resistors to use. You can try to verify your setup by measuring the resistance between the senseA pin and Ground, and senseB pin and Ground. This should be .1 Ohm, but most meters will have a hard time measuring this. Test by touching the meter leads together first and note the reading. Then test the pin and ground and the difference between the two values should be .1 Ohm. If you are using software stepping signals from the parallel port, your PC will need good latency. Even with good latency, the signals will not be very fast. I usually limit stepping modes to 1/4 or 1/8 stepping. The motor impedance is important too. Generally, more current produces more torque, more voltage provides higher speed. If one turns the motor shaft, the motor will produce a voltage and act like a generator. The voltage produced is dependent on the motor speed. Conversely, if one wants to drive the motor electrically, the corresponding voltage needs to be supplied for the desired speed. Of course the stepper motor speed is set by the stepping rate, but the voltage needs to be high enough to support the desired speed. Motors have different voltage per RPM specifications. The motor coil resistance or impedance is also related to V/RPM. Some less common motors will have a high V/RPM and not be suitable with this driver and application. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On 03/29/2015 09:29 AM, Gene Heskett wrote: On Sunday 29 March 2015 12:01:26 andy pugh wrote: On 29 March 2015 at 16:41, Gene Heskett ghesk...@wdtv.com wrote: You haven't said, other than you built them yourself, what your driver is, so we are all in the dark trying to read between the lines. He said that they were these: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm That link opens with a pay alms or go away script, so I can't see it. When will folks learn that if they intend to share, put it on pastebin.ca, it Just Works(TM). Cheers, Gene Heskett The above link worked fine for me. It went right to the driver page without any pop-up or login: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm Digikey has this link to the chip: http://media.digikey.com/pdf/Data%20Sheets/Sanken/SLA7060-62,65-67M.pdf Alegro: http://www.allegromicro.com/Products/Sanken-Products/Sanken-ICs/Sanken-Motor-Driver-ICs/Sanken-Stepper-Motor-Unipolar-Driver-ICs/SLA7060-1-2M.aspx The driver schematic should be attached. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Smart little device for zeroing
@Andy, In the newer versions of LinuxCNC you can re-define the behaviour of M6 So that's what all the talk about re-mapping is in the gmoccapy forum... Geesh more complications :) As for the frantic spinning of A, XYZA will all be live all of the time, I would think in one machine configuration. At least that's what I've paid for, I'm not into swapping wires to share a driver. My concern is that to do rotary work I'll have to use a different processor, wrapping X about the A axis. That's when I'm wondering if all the X moves required for tool changes will be performed as expected, and then go back to A0 and start running the wrapped gcode. The tool changes are manual by the way, only the tool lengths will be automated. Now Im reading there are issues with feed based on the diameter of the stock, that folks have trouble with the linear feeds not being properly transferred to degrees per whatever. My rabbit hole is getting deeper, Alice. :) Again, thanks Gene, and Andy for the support! On Sun, Mar 29, 2015 at 5:00 AM, andy pugh bodge...@gmail.com wrote: On 29 March 2015 at 04:53, Scott Salrin scott.sal...@gmail.com wrote: Here is a link to the code Probotix uses: http://www.probotix.com/wiki/index.php/Automatic_Tool_Length_Sensor Their approach to tool-length sensing is to replace the M6 tool change command with a call to a subroutine which probes the tool length and then issues the tool-change command. Basically it adds moves and a probe before and after the M6 command. In the newer versions of LinuxCNC you can re-define the behaviour of M6, so you can in fact leave your G-code using M6 for tool-change and the effect will actually be to call the 100.ngc subroutine. (The M6 in the re-mapped subroutine is interpreted as a normal M6, the subroutine doesn't keep recursively calling itself) This would be the minimal remap described in section 5.6 here: http://www.linuxcnc.org/docs/html/remap/structure.html#_making_minimal_changes_to_the_built_in_codes_including_tt_m6_tt However, the Probotix post-processor for Vectric is set up to use the O100 CALL rather than M6, so if you are using that postprocessor things should work without the remap process. As for whether the tool-change macro will lead to frantic spinning of the A axis rather than X movement, that rather depends on how the 4th-axis work is configured. If it is an alternative machine config which has the A-axis stepper driven by the G-code X-word then I rather suspect that it would. But there are other ways that it might be done. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Smart little device for zeroing
On 29 March 2015 at 19:27, Scott Salrin scott.sal...@gmail.com wrote: As for the frantic spinning of A, XYZA will all be live all of the time, I would think in one machine configuration. At least that's what I've paid for, I'm not into swapping wires to share a driver. Which stepper is driven by which G-code Axis name is something that it easily configured in the HAL config. For example the Z-axis motor on my lathe becomes the X-axis motor when I put the (dual-purpose) machine into milling machine mode. It _sounds_ like you are talking about a limitation in the CAM software, though, so it is possible that the A/X confusion is all invisible after the CAM stage. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
You missed the part where Gene suggested you check motor temp not chip temp. :) On Sun, Mar 29, 2015 at 7:13 AM, kqt4a...@gmail.com wrote: On Sat, 28 Mar 2015, Gene Heskett wrote: On Saturday 28 March 2015 19:36:09 kqt4a...@gmail.com wrote: On Sat, 28 Mar 2015, Bertho Stultiens wrote: On 03/28/2015 08:37 PM, kqt4a...@gmail.com wrote: I have a question about the voltage to drive a stepper motor 12 volts works but higher voltages make the motor weaker I am building a simple stepper driver A nema 23 2.7 amp stepper motor and 36 volt power supply The controls are hand held, forward ,reverse, stop, and speed I built the controls and driver using a 12 volt battery to test Now I completed the project and am using the 36 volt supply The motor runs at the same speed but it is so weak I can hold the shaft and stall the motor This is also the same with 36 and 24 volt batteries With a 12 volt battery I can not stall the motor I am using http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm and an Arduino I would be happy if someone would point out my stupidity The chip uses a constant current setup using PWM. When you raise the supply voltage then the trip-current is reached sooner and recovery may take too long for the next PWM cycle. The datasheet says that the off-time is between 7 and 12 microseconds. Your high voltage level may cause a feed-through on the current-limiter because of the increased rising flank of the current. This decreases the on-time vs off-time and the effective current to the motor is reduced which results in a lower torque. The problem may be in the physical setup, where too much noise is propagated. You should check the wiring and use an oscilloscope to check the signals for spikes etc.. I do not have an oscilloscope You may have to cultivate a friend who does have one. As a scope user myself since 1951, there is no other way to measure things where time vs voltage or amperage needs to be measured. and I don't think noise is the problem I am single and it is usually pretty quiet around here :) The noise being refered to is electrical, not acoustical and steppers, with their built in PWM modulation in a decent driver that does regulate current to maintain the average, is one noisy puppy electrically, which is the sort of noise being referred to. One more question though. After half an hour powered up on 12 volts, how does the motors temp (its gonna be hot, use an IR thermometer) compare with 1/2 hour powered up on 36 volts? If its smell it hot in 10 minutes, pull the plug, your drivers are not regulating the current adequately and the motor is saturated, possibly damaging the rotors magnetism forever If its many degrees cooler, then the driver may be turning itself down to protect the driver. If its smart enough, most of the lower cost drivers aren't. I have let the magic smoke out and broke the mirrors on quite a few allegro A-3977 based drivers. I switched to 2M542's off fleabay about 5 or 6 years back, buying enough to switch them all out with one spare for the parts drawer. Its still there, has not been needed. No IR thermometer I ran the motor on 12 volts for about 1 hour and the chip was only barely warm to touch Then I ran the motor on 36 volts for about 1 hour and the chip was only barely warm to touch The 36 volt power supply is close in the same container so I disconnected it and ran the motor on batteries Same results the motor is very weak -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Not ACME, ballscrews! Re: Anyone have leftovers from a 9x20 CNC conversion?
On Sunday 29 March 2015 02:32:48 Karlsson Wang wrote: I have a left over ball screw but do not know the price for these, It is around 2.5 metres long and I bought it used for below $100 Got a pix of that? I may have a home for it, as z drive on a 100+ yo Porter lathe that I have looked at its rusty hulk sitting out in the weather a couple times right here in town. This might make me at least make an offer for it. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] ot: voltage and steppers
On Sat, 28 Mar 2015, Gene Heskett wrote: On Saturday 28 March 2015 19:36:09 kqt4a...@gmail.com wrote: On Sat, 28 Mar 2015, Bertho Stultiens wrote: On 03/28/2015 08:37 PM, kqt4a...@gmail.com wrote: I have a question about the voltage to drive a stepper motor 12 volts works but higher voltages make the motor weaker I am building a simple stepper driver A nema 23 2.7 amp stepper motor and 36 volt power supply The controls are hand held, forward ,reverse, stop, and speed I built the controls and driver using a 12 volt battery to test Now I completed the project and am using the 36 volt supply The motor runs at the same speed but it is so weak I can hold the shaft and stall the motor This is also the same with 36 and 24 volt batteries With a 12 volt battery I can not stall the motor I am using http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm and an Arduino I would be happy if someone would point out my stupidity The chip uses a constant current setup using PWM. When you raise the supply voltage then the trip-current is reached sooner and recovery may take too long for the next PWM cycle. The datasheet says that the off-time is between 7 and 12 microseconds. Your high voltage level may cause a feed-through on the current-limiter because of the increased rising flank of the current. This decreases the on-time vs off-time and the effective current to the motor is reduced which results in a lower torque. The problem may be in the physical setup, where too much noise is propagated. You should check the wiring and use an oscilloscope to check the signals for spikes etc.. I do not have an oscilloscope You may have to cultivate a friend who does have one. As a scope user myself since 1951, there is no other way to measure things where time vs voltage or amperage needs to be measured. and I don't think noise is the problem I am single and it is usually pretty quiet around here :) The noise being refered to is electrical, not acoustical and steppers, with their built in PWM modulation in a decent driver that does regulate current to maintain the average, is one noisy puppy electrically, which is the sort of noise being referred to. One more question though. After half an hour powered up on 12 volts, how does the motors temp (its gonna be hot, use an IR thermometer) compare with 1/2 hour powered up on 36 volts? If its smell it hot in 10 minutes, pull the plug, your drivers are not regulating the current adequately and the motor is saturated, possibly damaging the rotors magnetism forever If its many degrees cooler, then the driver may be turning itself down to protect the driver. If its smart enough, most of the lower cost drivers aren't. I have let the magic smoke out and broke the mirrors on quite a few allegro A-3977 based drivers. I switched to 2M542's off fleabay about 5 or 6 years back, buying enough to switch them all out with one spare for the parts drawer. Its still there, has not been needed. No IR thermometer I ran the motor on 12 volts for about 1 hour and the chip was only barely warm to touch Then I ran the motor on 36 volts for about 1 hour and the chip was only barely warm to touch The 36 volt power supply is close in the same container so I disconnected it and ran the motor on batteries Same results the motor is very weak -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Smart little device for zeroing
On 29 Mar 2015, at 04:53, Scott Salrin wrote: Thanks again for the words of encouragement the other day, guys. I've been thinking, which has always been dangerous for me. I need to bounce my thoughts off of some smart people, to set me straight. First let be beg forgiveness if this is inappropriate, or if I pull this thread off topic... It seemed dead anyway. As I mentioned, I have not received the machine yet, so all of this is theory at this point. The router is a Probotix Nebula, and will come ready to make chips out of the crate, but I have a lot to learn in preparation and trying to figure it out on my own is starting to hurt. I am having a tool length switch installed and it will come configured with a tool changing routine. The routine is called by a o100 command. I am also having a 4th axis rotary installed. This is where I am confusing myself. I haven't purchased the cam yet, but do believe it will be vectric aspire. This means the the rotary work will have to be wrapped around I believe the x axis, in this case, at the post processor. I use Vectric VCarve Pro, which is of the same family as the more capable Aspire. I have done some wrapped rotary axis engraving, and I'm not entirely sure you have the right story here. I think (but am not 100% certain) that Aspire expects a 4th axis to be the rotary axis (i.e. not cable-swapping to temporarily substitute one of the other axes). Vectric have a very active and well-managed Forum for support. Questions are usually answered quickly and helpfully, so I suggest you ask this question directly, on the Forum. If my own impression is wrong, it is not difficult to output G code fro Aspire, then edit it using a simple diameter/length conversion factor to cause the G code commends for one axis (say X) to act s wrapped A axis code to control your 4th rotary axis. I've done that quite successfully in the past. I also suggest you specifically ask for a LinuxCNC post-processor whcih can cope with a wrapped 4th axis. Vectric originally didn't have a LinuxCNC post-processor at all, but wrote one for me when I requested it. I did have a conversation with them about a LinuxCNC post-processor which would output the correct A axis code when using their wrapped-axis gadget. They said they were willing, but, for simple logistical reasons (coder was away in the USA at the time) they didn't get around to it in time, and I did my own thing with a conversion factor. It would be worth returning to that, if they haven't already done it. Marcus I also want to use the makers guide featured in the attached video, foe most of my work, and will need to pull off all the custom buttons and code to make that happen. Am I correct in thinking that all the coding I'll need to do will be in absolute co-ordinates, and not affected by the gcode that is wrapped around the x axis. Like if I set the rotary to be say a G55 work co-ordinate, and run a wrapped gcode file that has tool changes in it, when a tool change routine is called the machine will go to the tool change position, wait for me, do the routine and go back to G55 and start running the wrapped code again? Or, is it going to sit there after the new tool length offset and spin the A axis instead of travelling back the the work offset origin? Here is a link to the code Probotix uses: http://www.probotix.com/wiki/index.php/Automatic_Tool_Length_Sensor I apologize for all the background, but don't know enough to know how much info you might need, or if you get these newbie questions all the time. I do appreciate any time taken to help, Scott On Fri, Mar 27, 2015 at 4:55 PM, Gene Heskett ghesk...@wdtv.com wrote: On Friday 27 March 2015 17:42:14 andy pugh wrote: On 27 March 2015 at 21:35, Scott Salrin scott.sal...@gmail.com wrote: I just need to find a way to make it work in linuxcnc. It isn't magic. And you won't need any C. Yeah, if I can write the code to do that so can he. I do it in pieces, like I think theres a holefinder.ngc on my web page that can be edited to work with that jig. Probably a poor tutorial, but it works well enough for drilling pcb holes halfway thru the board, turning the board over and drilling it half way from the other side with the holes meeting in the middle w/o a visible offset. Applied offsets are TBD by the user though. Here its repeatable to under a thou variation. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to
Re: [Emc-users] ot: voltage and steppers
On Sunday 29 March 2015 13:25:09 andy pugh wrote: On 29 March 2015 at 17:29, Gene Heskett ghesk...@wdtv.com wrote: http://piclist.com/techref/io/stepper/SLAm/SLAm_bld.htm That link opens with a pay alms or go away script, so I can't see it. Strange. It just opens as a web page here. And this time it worked for me too, Andy. I tried it 4 times earlier today, never got thru. Two things I note, first being that its unipolar which I have zero experience with, my stuff is 100% bipolar, and 2: there are no timing specs anyplace on the page, although I expect those can be had from the Allegro site. Someone else opined that the 5 volt supply, which does the pullups, might not be up to snuff. That, the OP can check with a std digital meter. To get much deeper than that will I expect, require a decent scope and a trained eye to read it. Cheers, Gene Heskett -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Genes Web page http://geneslinuxbox.net:6309/gene -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cleaning machinery
- Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Saturday, March 28, 2015 10:53:13 PM Subject: Emc-users Digest, Vol 107, Issue 80 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Cleaning machinery (andy pugh) 2. Re: Cleaning machinery (Dave Cole) 3. Re-purpose or move along? (Andy Evans) 4. Re: Smart little device for zeroing (Scott Salrin) 5. Re: Custom EMC installation? (Peter C. Wallace) 6. Not ACME, ballscrews! Re: Anyone have leftovers from a 9x20 CNC conversion? (Gregg Eshelman) Thank you for the help. I don't want to take a chance on ruining a very nice, accurate, tight, spanish machine tool. - Messa at alllge: 1 Date: Sun, 29 Mar 2015 00:47:35 + From: andy pugh bodge...@gmail.com Subject: Re: [Emc-users] Cleaning machinery To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: can1+yzvnoctbysim7ewb22b7t-o5sxqyjqkttrx4sbr80zf...@mail.gmail.com Content-Type: text/plain; charset=UTF-8 On 29 March 2015 at 00:42, richsh...@comcast.net wrote: Any suggestions on a degrease process? I normally use what we call White Spirit but it sounds like you tried that. http://en.wikipedia.org/wiki/White_spirit -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Message: 2 Date: Sat, 28 Mar 2015 21:22:56 -0500 From: Dave Cole linuxcncro...@gmail.com Subject: Re: [Emc-users] Cleaning machinery To: emc-users@lists.sourceforge.net Message-ID: 55176200.9050...@gmail.com Content-Type: text/plain; charset=windows-1252; format=flowed Scrape off all you can of the heavy stuff. http://www.ehow.com/way_5434198_homemade-engine-degreaser.html The kerosene mix works very well on heavy grease. Spray it on, let it sit, brush and wipe it off, repeat. Dawn dishwashing soap works well with kerosense. Buy big bottles of it from Sam's/Costco etc. It works best when things are warm of course. Aim a space heater at the machine for a while and get it up to 80-90 degrees then spray it on and things will go much faster. I've used that solution for years to clean up dirty engines. A cheap pump up tank sprayer such as used for weeds etc works fine. Dave On 3/28/2015 7:42 PM, richsh...@comcast.net wrote: I just bought a 1975 vintage Anayak FV2 mill, imported to the US by DoAll. It has so much grease, muck, and yuck on it, I need to clean it. So far I've tried citrus based solvent, paint thinner, automotive, parts cleaner.. Applying it via green and brown scotch brite pads. Any suggestions on a degrease process? - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Saturday, March 28, 2015 2:44:22 PM Subject: Emc-users Digest, Vol 107, Issue 78 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or unsubscribe via the World Wide Web, visit https://lists.sourceforge.net/lists/listinfo/emc-users or, via email, send a message with subject or body 'help' to emc-users-requ...@lists.sourceforge.net You can reach the person managing the list at emc-users-ow...@lists.sourceforge.net When replying, please edit your Subject line so it is more specific than Re: Contents of Emc-users digest... Today's Topics: 1. Re: Possible New Lathe (richsh...@comcast.net) 2. ot: voltage and steppers (kqt4a...@gmail.com) 3. Re: ot: voltage and steppers (Dave Cole) 4. Re: ot: voltage and steppers (kqt4a...@gmail.com) 5. 2.6.4 to 2.6.7 update without a network connection? (Gregg Eshelman) -- Message: 1 Date: Sat, 28 Mar 2015 15:24:42 + (UTC) From: richsh...@comcast.net Subject: Re: [Emc-users] Possible New Lathe To: emc-users@lists.sourceforge.net Message-ID: 1991675046.16595850.1427556282912.javamail.zim...@comcast.net Content-Type: text/plain; charset=utf-8 Boris? Obviously, an oversize Van Norman vertical mill, I'd say 7,000 lbs or so. - Original Message - From: emc-users-requ...@lists.sourceforge.net To: emc-users@lists.sourceforge.net Sent: Friday, March 27, 2015 11:45:16 PM Subject: Emc-users Digest, Vol 107, Issue 76 Send Emc-users mailing list submissions to emc-users@lists.sourceforge.net To subscribe or
