Re: [Emc-users] change of subject, brass or copper?

Most of the 140gr 6.5CM data I've seen the bullet slows down past 24" bbl length. Not sure why you'd want/need a barrel burner either (isn't thats what people pick 6mm/243 win for?) The stock Hornady 140 ELD-M load is already comparable ballistics to 300 win mag. I've shot 6.5CM out to 1200yds.

Re: [Emc-users] Rough motion with servos

May I opine that noise on one of the encoder lines may cause a zero speed estimation. If you get two of the same channel edges in a row the encoder logically must have reversed direction. It must go through zero speed to change direction. Since a third edge (one on the other channel) is not yet

Re: [Emc-users] Milling setup question

Why not swap 2&3? Machine base flat and machine keyway for the table. Then mount to the table and indicate off the table slot to bore the hole exactly on center? By default they will be parallel. On Thu, Mar 30, 2017 at 7:02 AM, andy pugh wrote: > If you have a part with a

Re: [Emc-users] damn radio shack

Just a couple days ago RS was preparing to file for bankruptcy *AGAIN*. They need to give up. On Tue, Mar 7, 2017 at 8:18 AM, Ron Ginger wrote: > On 3/7/2017 4:55 AM, emc-users-requ...@lists.sourceforge.net wrote: > > BTW I thought all of the Radio Shack stored were

Re: [Emc-users] OT - Arduino development - Atmel ICE useful ?

en running a commercial RTOS its very necessary. On Fri, Feb 24, 2017 at 2:22 PM, Chris Albertson <albertson.ch...@gmail.com> wrote: > On Fri, Feb 24, 2017 at 6:54 AM, Stephen Dubovsky <smdubov...@gmail.com> > wrote: > > > > > Indeed support is VERY useful. There are

Re: [Emc-users] OT - Arduino development - Atmel ICE useful ?

On Thu, Feb 23, 2017 at 9:47 PM, Erik Christiansen wrote: ... > Conversely, why is the ATtiny15 > "best" for the job at hand? Answer: Because it has a few ADC channels, I > have a few of them in my goodies box, AND I'm set up to develop with > them. That last one is

Re: [Emc-users] Voltage/Motor RPM Relationship with Brushless Drives

esigners that it can happen. No idea what the coercivity of a modern neodymium magnet is at typical motor operating temp. On Thu, Jan 26, 2017 at 7:09 AM, Eric Keller <eekel...@psu.edu> wrote: > On Wed, Jan 25, 2017 at 11:22 PM, Stephen Dubovsky <smdubov...@gmail.com> > wrote

Re: [Emc-users] Voltage/Motor RPM Relationship with Brushless Drives

On Wed, Jan 25, 2017 at 10:25 PM, Jon Elson wrote: > Field weakening is not possible on permanent magnet > brushless motors. > > It actually is. Apply current in the D axis will oppose and reduce the net flux in the gap. Move a coil in between two N poles permanent

Re: [Emc-users] To BJT & PCW

I have those same PA-09 crimpers. They will crimp the insanely tiny JST-SH (1.0mm pitch) connector. They work very well. Stephen On Sat, Dec 3, 2016 at 8:33 PM, Danny Miller wrote: > For those micro-pins, I had NO success with any crimper but this one, > which worked

Re: [Emc-users] An observation on digital calipers

> > I also tried a cheap chinesse one but it's was a disaster. Then I found > these Mitutoyo that are extremely cheap and come from China but I don't > know what to think. > > http://www.ebay.com/itm/Mitutoyo-500-196-20-30-300mm- > 12-Absolute-Digital-Digimatic-Vernier-Caliper-/331999662209? >

Re: [Emc-users] following along in my what if musings about ther new oramge pi 2e

sow...@gmail.com> wrote: > On Mon, Oct 24, 2016 at 10:42 PM, Stephen Dubovsky <smdubov...@gmail.com> > wrote: > > Why would UDP need resends on a shared ethernet port? There are no > > collisions on a full-duplex port & switch (which is pretty much ALL of > them > &

Re: [Emc-users] following along in my what if musings about ther new oramge pi 2e

Im fully aware UDP doesn't resend. But there are no collisions on modern ethernet LANs. No more reason a UDP packet would be corrupted going through a (shared) switch as a direct connection. On Tue, Oct 25, 2016 at 8:23 AM, Mark <wendt.m...@gmail.com> wrote: > On 10/24/2016 10:42 PM

Re: [Emc-users] following along in my what if musings about ther new oramge pi 2e

Why would UDP need resends on a shared ethernet port? There are no collisions on a full-duplex port & switch (which is pretty much ALL of them now-a-days.) Passive hubs went the way of the dodo. On Mon, Oct 24, 2016 at 10:22 PM, Gene Heskett wrote: > On Monday 24

Re: [Emc-users] Hacking a sim runtime mode

I think the error of this approach (using N times higher accel/vel) is coming from the piecewise linear approximations of the curves going bad. If you try to follow a curve N times faster, then there are N times fewer samples along that curve for a fixed time sampling period. That introduces

Re: [Emc-users] Hacking a sim runtime mode

In a sim config, can you increase the base thread rate 100x+ w/o it knowing its been sped up? Disable the RTOS scheduling entirely? It would run all the same calcs, same HAL, same gains/accel, just no RTOS pauses between calls. Basically count the # of base thread cycles, multiply what you told

Re: [Emc-users] brass and warpage during machining.

On Tue, Aug 2, 2016 at 10:46 AM, Mark wrote: > You can't "heat treat" brass/bronze/copper etc (non-ferrous) to harden. > You can only anneal those metals. They do, however, work harden, which > annealing takes away. > > Mark > FWIW, There are copper alloys that can be

Re: [Emc-users] O.T.: Machining paper stack

If you are hollowing out a book, why not glue the pages together first? Should be able to come up w/ some sort of super thinned out glue to dip the pages into (while holding the bookends back.) Then clamp in a press to let dry. Would have to do this w/ the covers closed to get the spine and

Re: [Emc-users] 5C adapter question

My L00 MT4.5 Clausing 5C adapter sticks out of the spindle a similar amount. It's for the thread protector (which also serves to eject the adapter when you unscrew it.) On Jul 1, 2016 11:02 PM, "Gene Heskett" wrote: > Greetings everybody; > > This Sheldon lathe came with

Re: [Emc-users] Major lags when zeroing axes

You can not just shift the extents by +2" on a non-cartesian machine - you have to recheck every point. We tend to forget how complex the general case can be when we're used to running cartesian mills/routers. Stephen On Mon, Jun 27, 2016 at 1:18 PM, andy pugh wrote: > On

Re: [Emc-users] FPGA firmware for SoC's - please watch https://github.com/machinekit/mksocfpga

Depends on how you define suitable. For straight up hard-switched boost/buck I would agree. Try implementing something like phase-shift modulation to get 'free' ZVS soft-switching (lower EMI and higher efficiency) and I will disagree. The microcontroller horsepower typically isn't lacking but

Re: [Emc-users] Modbus wiring

You can not include the termination or pull up/down resistors on a RS422/485 network in the drivers (unless they can by disabled.) You don't know where (or how many) are located on the bus. They are multi-drop networks after all. Only terminate the two far ends. On Fri, Apr 1, 2016 at 1:37

Re: [Emc-users] Copying G code files from PC to PC

Rick, would one of those USB flash drives w/ built in wifi work? (Sandisk makes one, Im sure there are others.) The machine would see the USB flash drive and you could drop files on it from another machine via the wifi? SMD On Thu, Mar 24, 2016 at 2:22 PM, Rick Lair

Re: [Emc-users] Linuxcnc on arm

And there are some that do both 1 *AND* 2. Look at the Xilinx Zynq for example. Dual gigahertz A9 cores w/ a FPGA core (Spartan/Virtex) that IIRC is larger than the one used for the Mesa 5i25. Could run a zillion channels of PWM or even hostmot2. We were porting some code to it for a work

Re: [Emc-users] LinuxCNC 2.7.4 is released

+100 to that! :D *THANK YOU* for the hm2 sserial fix. Endured the 5C garage temps for a while to update and then further troubleshooting my X axis (must have flipped a bit or swapped the wiring polarity while I was monkeying w/ the servos to quiet them down.) The Supermax mill is back up and

Re: [Emc-users] LinuxCNC for retrofit of Cincinnati Milacron CNC?

No mixup. I used to work for GE (and Hughes) designing AC induction drives for mostly traction applications. You can servo **ANY** induction motor. The only limit to frequency response is the inductance and that can be solved with high enough bus voltage (DC motors and steppers have the exact

Re: [Emc-users] LinuxCNC for retrofit of Cincinnati Milacron CNC?

The positioning ability of an induction motor is no different to that of a DC servo motor. When no torque is needed both go to zero voltage/current to stop moving (though technically an induction motor can maintain a DC current if it chooses to to provide braking - similar to shorting out the DC

Re: [Emc-users] VFD Tweaking

They do typ top out around 3HP 1ph. So just don't use them;) What John pointed out is entirely correct. The inverter runs from a rectified DC bus. There are 2 things limiting you running a 3ph vfd on a 1ph line. 1) Phase loss detection. Some big inverters will fault if they detect one of the

Re: [Emc-users] VFD Tweaking

The lack of torque multiplication by removing a variator/gearbox can be partially solved by just using a bigger motor. Its my understanding that Monarch use a 10hp motor+VFD for 10EE retrofits instead of using a gearbox. Simple. The original MG set versions used a 3hp?? Though I have no idea

Re: [Emc-users] Grounding Issues

I run my pc and monitor off the 240. Almost all are universal input nowadays (some pcs require a switch) and have isolated supplies. On Dec 25, 2015 12:18 PM, "Ed" wrote: > On my CHNC I have a 500VA control transformer to drop 240V to 120V for > the computer and the monitor. That

Re: [Emc-users] Grounding Issues

Peter, this is the root cause in the change of behavior between <=2.6 and 2.7 w/ the 5i25+7i77 that a couple of us have been having (was discussed here about a week ago)? I have noticed an occasional warning in the prior version I was running (just at startup iirc.) I need to put some more noise

Re: [Emc-users] Optoisolater timings (was: Z axis stepper gradually losing position)

FWIW, the iCoupler type things from ADI and Silicon Devices are faster, cheaper, better isolation, and lower powered than high speed optos. win, win, win, win;) On Mon, Dec 14, 2015 at 7:11 PM, Jerry Scharf wrote: > Hi, > > Just did a super quick google search and came up

Re: [Emc-users] Lathe spindle encoder drive

Opps. Yes I meant an involute hob is a simple trapezoid. No curves;) Cycloidal hob is indeed a funnier shaped thing and far more difficult to make. On Tue, Dec 8, 2015 at 5:14 PM, Dave Caroline wrote: > Hobs can be ground to generate cycloidal teeth as well as

Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

How to set dec? And what was it in prior versions? On Tue, Dec 8, 2015 at 7:49 PM, andy pugh wrote: > On 8 December 2015 at 23:25, Peter C. Wallace wrote: > > Possible software fixes are having the driver ignore this error (as > apparently > > 2.6 does) >

Re: [Emc-users] Lathe spindle encoder drive

If you use a divider head its not hobbing. Hobs do not have epicycloidal teeth. They are trapezoidal iirc. The curved tooth comes from rotating both the hob AND the blank together to get multiple angles of attack on the cut. On Tue, Dec 8, 2015 at 2:52 PM, Peter Blodow

Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

I can generate mine tonight but it looks exactly the same. On Tue, Dec 8, 2015 at 3:26 PM, Todd Zuercher wrote: > Here it is. > > - Original Message - > From: "Peter C. Wallace" > To: "Enhanced Machine Controller (EMC)"

Re: [Emc-users] Lathe spindle encoder drive

I *THINK* if you incline your resolver gear you can use a straight cut gear. IIRC, the sum of helix angles must add up to the shaft angles. In your picture the shaft angles are 90deg so one helix is something like 80deg (the large gear) and the other is 10deg (the small gear). You can do the

Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

uot;error = (13) Communication error" Looks like something is still mismatched? FWIW, it looks like the 5i25 is ver 1.43. Newer than it was, though not sure if that is the latest. Thank you, Stephen On Mon, Dec 7, 2015 at 12:06 AM, Stephen Dubovsky <smdubov...@gmail.com> wrote: > Th

Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

unzip it, and follow > the README file in sserial/utils/linuxcnc. > > So, you will need ssinstall script and a special script, called update7i77 > > 12/07/2015 06:03 AM, Stephen Dubovsky rašė: > > Hello all, > > Upgraded the Ubuntu mill (2.5?) to 2.7.3. Using a 5i25 &

[Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

Hello all, Upgraded the Ubuntu mill (2.5?) to 2.7.3. Using a 5i25 & 7i77. It complained that the 7i77 needed updating. I found some docs on the forum and updated the 5i25. But it still complains "hm2/hm2_5i25.0: Warning: sserial remote device 7i77 channel 0 has old firmware that should be

Re: [Emc-users] debris collection

There is a limit to db suppression for rifles. I can double up muffs over plugs when shooting a 50bmg but its really isn't THAT much quieter. Bone conduction limits the max suppression possible. I have a set of 3M(?) muffs that are super quiet but would be useless firing a rifle as they

Re: [Emc-users] For SamS - Emco Compact 5 PC user(s) needs help on Model Engineer website

I have a couple Compact5s and its definitely a brushed dc spindle motor. Using a KBC DC speed controller on one of them but I can't reverse it w/o adding some sort of DPDT relay and some time delays. It uses AC input so pretty easy to use. I've thought about adding spindle reversing for rigid

Re: [Emc-users] Tool changer finally working on our mill project

You may need to have it retracted to clear another tool in an adjacent pocket in the turret. What if you put a large diameter tool, like a face mill, beside another? On Tue, Nov 10, 2015 at 4:54 PM, Dave Cole wrote: > If you rotate it with it extended it will have a

Re: [Emc-users] Spindle Voltage?

Trickier than that. Depending on the corner point it may be able to develop the same hp at half speed w/ twice the torque. One would think that an induction motor that needed variable speed would be designed to top out somewhere on the const hp part of the curve than right on the corner point.

Re: [Emc-users] Knurling with a threading tool using spindle coordinated motion (G33) on EMCOTurn 120P CNC lathe

The GS2 is a simple V/Hz control which is open loop. 208V @ 60Hz = 1800rpm simply scales 1/18 to 11.5V @ 3.3Hz = 100rpm. Nonlinearities will often cause problems at very low speeds in an open loop system. (Note: the GS2 might have some functions to boost the voltage at low speeds and such to

Re: [Emc-users] Inverted Tooth Chain Drives

You can't run a belt fast *IN* a fluid. You can run it in an oily environment like the outside of a car engine. But to run one submerged it will 'hydroplane'. The fluid that fills the gear tooth void must be pumped out when the belt tooth enters it. The fluid in a belt has nowhere to go but

Re: [Emc-users] looking for inexpensive modular encoder

On Thu, Jul 16, 2015 at 6:39 AM, Erik Christiansen dva...@internode.on.net wrote: Yebbut, what on earth do we use when flashplayer won't cut it any more? HTML5 replaces Flash for the most part. -- Don't Limit Your

Re: [Emc-users] Small cnc-controlled chuck

There are air operated collet drawbars for grinders. My KOLee came w/ a pair of them. SMD On Fri, Jul 10, 2015 at 2:58 PM, Dave Cole linuxcncro...@gmail.com wrote: I think that most CNC power 3 jaw chucks are hydraulic. You might be able to find one used and setup an air over hydraulic

Re: [Emc-users] Engraving direction question

If you look at something like Vectric's V-carve Pro it does the faster no-lift case. I suspect the high-end Aspire tool does the same since they are based on the same code base. For something like an A they don't even lift to go back a little to get to the cross bar. And its geared towards wood

Re: [Emc-users] Serial FPGA buses/interconnections [Was: Sandy box]

As has been stated, Ethernet has lots of advantages. We use it for a real time control network (loop control 1kHz.) We just use an unused ethertype. All other stuff on the network will thus ignore the data and we don't need to have an IP stack (we do since we also run web traffic, but our

Re: [Emc-users] ot: motor speed control

, May 15, 2015 at 11:33 AM, Jon Elson el...@pico-systems.com wrote: On 05/15/2015 09:34 AM, Stephen Dubovsky wrote: A brushed AC motor in a drill/router/saw is almost assuredly a 'universal' motor. Its a DC parallel field wound motor. I really think you mean SERIES, here. Jon

Re: [Emc-users] ot: motor speed control

A brushed AC motor in a drill/router/saw is almost assuredly a 'universal' motor. Its a DC parallel field wound motor. Thus both the rotor and stator are connected to the same terminals. When the AC polarity reverses BOTH magnetic fields reverse and the motor still turns the same direction

Re: [Emc-users] Ethernet!

No collisions on full duplex ethernet (which is practically ALL 100bT and faster networks.) You can sit behind another packet from a switch going to the same destination. VLAN/priority tagging can be used to bump real time up to highest priority (jump to the head of the queue put simply.) Takes

Re: [Emc-users] OT: Allen Bradley PowerFlex 40 question

It *IS* AC. 10-30kHz AC. And 40A isn't going to cut it. I think Leonardo is mentioning 97A/phase MAINS input. Compute the input power draw. Is typ goes through a high freq stepdown transformer so its only a couple volts AC and hundreds (thousands?) of amps. Takes many many kJ of energy to

Re: [Emc-users] VFD causing limits to trip. Huh?

EMI. VFDs generate lots of it. You're likely getting lots of noise coupled into your limit switch cabling. Shield the vfd wires if possible. Running in a shielded single cable is probably best. Separate the motor and switch cables as much as possible too. On March 6, 2015 6:56:08 AM EST,

Re: [Emc-users] A project for someone in or near Indiana

Gregg, You in the continental US? I could probably ship you one of mine for about that;) I bought three in one lot from a school auction. Converted one to LCNC for myself, sold another to a friend who is also doing the same, and still have the third. Mine are yellow though. On Thu, Jan 29,

Re: [Emc-users] Way OT: PCB Rubber Buttons

Slice the buttons off some donors. We have elastomeric keypads made for us (offshore) and AFAIK, they drop the carbon buttons in the molds and inject the elastomer. They can be cut off w/ an exacto knife. I don't have any raw buttons but I could send you some keypads that have 4 per. Though is

Re: [Emc-users] Making ebony buttons in wholesale numbers

Yes, IME they will cut a V-ish shaped groove where none existed before. Common in sign carving. Mine are woodworking bits so they wont plunge/centercut well and would have to be ramped in like if using a face mill to pocket. Dont know if the little ones for metalworking are center cutting or

Re: [Emc-users] Lathe conversion with Mesa 5i25 / 7i76

Eh? Google has owned YouTube for what has to be a decade by now. On Thu, Oct 30, 2014 at 10:39 AM, Pete Matos petefro...@gmail.com wrote: Yeah I am pretty well against anything Google plus. tried it and it wanted to turn my YouTube account against me and a host of other annoyances. I

Re: [Emc-users] The Warm Glow of Mach 3

Yes, the old russian rockets are BETTER than anything the US produced, even today. They are closed cycle. There was a very good documentary on them not too long ago I watched but can't find it now. On Wed, Oct 29, 2014 at 8:07 PM, Home hjjohn...@sasktel.net wrote: As I understand it, those

Re: [Emc-users] The Warm Glow of Mach 3

Found it: the engines that came in from the cold https://www.youtube.com/playlist?list=PLv7-kDhSnm7P1dAiJvvjeiLgwfv8_58TO On Wed, Oct 29, 2014 at 8:15 PM, Stephen Dubovsky smdubov...@gmail.com wrote: Yes, the old russian rockets are BETTER than anything the US produced, even today

Re: [Emc-users] gvcpDRO

Looks really nice Kirk. I have a manual lathe that I have scales for but haven't bought a display device yet. On Wed, Oct 22, 2014 at 2:54 PM, John Alexander Stewart ivatt...@gmail.com wrote: Kirk; Interesting - I did just sell my drill press, and am finishing up a G0704 mill conversion,

Re: [Emc-users] OT: Pogo Pins

Could you use a tag cable? (there are other sources of the same thing.) We use them for programming. http://www.tag-connect.com/ Samtec makes header sockets that can come up through the bottom of the board. We use those too. SMD On Wed, Oct 15, 2014 at 3:50 PM, Kirk Wallace

Re: [Emc-users] How to machine....

LOL. Just noticed the scale of the thing. Only 1/8 tall ramps? File it by hand. Only you know what it mates to and its exact function. How precise does it need to be? SMD On Mon, Oct 13, 2014 at 11:33 AM, andy pugh bodge...@gmail.com wrote: On 13 October 2014 16:18, Dave Caroline

Re: [Emc-users] Conditional code- GOTO

That usage does NOT require a goto, a conventional if statement works: He was simply pointing out the syntax. Of course a two line statement didn't need a goto. There are plenty of ways to use goto that are clean and structured. And every one of those ways is better done using

Re: [Emc-users] OT: Mill Vise Advise

All Kurt vises are keyed on the bottom. They even sell the keys in different stepped widths IIRC. My import vises are also keyed the same (but included the keys and have to be ground down if you have something other than a bridgeport sized slot.) So maybe the guy wasn't so clever;) They do

Re: [Emc-users] Slip ring - experiences

Rotary transformers may be a better idea than slip rings. AC couple everything. Resolvers, being AC in nature, work very well through them. On Fri, Jul 18, 2014 at 12:46 PM, andy pugh bodge...@gmail.com wrote: On 18 July 2014 17:39, jeremy youngs jcyoung...@gmail.com wrote: how about a

Re: [Emc-users] Ball Screw Drive?

On Thu, Jun 12, 2014 at 5:09 PM, rayj raymo...@frontiernet.net wrote: ... Assuming identical motors and driver boards, is it possible to wire both driver boards to the same output from the breakout board. Example: run the wires from the BOB X-axis step pin to the step input for 2 drivers

Re: [Emc-users] Some tentative progress on stiffening up the countershaft mounting

Cut down an allen wrench. I have a whole collection of them w/ ~1/4 stubs on the end. Or I cut off a short pc w/ a cutoff wheel and tack weld it to a flat bar. Or cut off a short pc, drop it in the screw w/ pliers/tweezers and use an open end wrench on the visible stub. You can make REALLY low

Re: [Emc-users] Announcing the LinuxCNC 2.6 branch

Andy, You talking about doing it this way? http://buildbot.linuxcnc.org/ (BTW, I found that by googling how to get linuxcnc master branch) Agreed. Doing git and compiling falls under linux guru. But even I can follow the above instructions. On Thu, Apr 3, 2014 at 4:01 PM, andy pugh

Re: [Emc-users] Tool changer

What spindle is that? On Thu, Apr 3, 2014 at 10:44 PM, Rod Fitzsimmons Frey rodf...@gmail.comwrote: Thanks for all the help everyone gave me getting my rack toolchanger going. It's working well. https://www.youtube.com/watch?v=0mwmas6hFRQ

Re: [Emc-users] Fun with trajectory planners and Halscope

Video clearly shows 2 different computers. On Tue, Feb 25, 2014 at 11:00 AM, John Kasunich jmkasun...@fastmail.fmwrote: I think (and Sam can probably confirm) that he was using two separate computers in both cases. On Tue, Feb 25, 2014, at 10:45 AM, Steve Stallings wrote: Also wonder if

Re: [Emc-users] Little OT, but...

It would be pretty awesome to read the DRO data from LinuxCNC... :) That would be pretty trivial w/ mesa boards (or any other hardware w/ encoder inputs.) SMD -- Flow-based real-time traffic analytics software. Cisco

Re: [Emc-users] Fun with trajectory planners and Halscope

Thats brilliant! Very interesting info Sam! Stephen On Mon, Feb 24, 2014 at 2:19 PM, sam sokolik sa...@empirescreen.com wrote: I have been testing a few things - 7i80, Robs new TP. I thought I would combine the two. After finding out that the mesa encoder counters will count step/dir

Re: [Emc-users] Crackling motors using Beaglebone

Are steps also being generated (back and forth) or is just the direction line toggling (w/ no steps)? On Sat, Feb 22, 2014 at 10:56 AM, Mark Tucker m...@rmtucker.f2s.com wrote: I seem to remember there being a fix for this around v2.3 or something to stop the stepper motors hunting.which i

Re: [Emc-users] Fwd: Re: Gantry Best Practices

3) I am really surprised that this works at all without blowing the drivers. You cannot guarantee that both motors are identical. You can feed two same identical step/dir inputs to multiple drivers. That is how my commercial accucut (48 sq) gantry did it. In theory, you could run an infinite

[Emc-users] PNCConf truncating metric screw pitch

We're using Mesa 5i25+7i76s in a couple Emco stepper based machines w/ 2.5mm pitch leadscrews. PNCConf seems to be truncating that 2.5 back to 2.0 every time we revisit the step calculator page (the pop-up where you check off/enter the pulley info, step multiplier, etc.) that calculates the main

Re: [Emc-users] Gcode to a keystroke

On Thu, Jan 30, 2014 at 2:24 PM, Jim Wilkin james.a.wil...@gmail.comwrote: Thank you Sebastion, This is for my new to me EMCO compact 5 cnc lathe retrofit. Hey! Im currently doing three of these! I have one machine up and running w/ Mesa boards, new steppers+drivers, D525MW, and an ELO

Re: [Emc-users] MPG ilowpass vs limit2/3

mode setting. As long as the filter rate is reasonable I guess the output isn't still settling for a good time after the wheel has stopped. Thanks again, Stephen On Tue, Jan 28, 2014 at 6:01 AM, andy pugh bodge...@gmail.com wrote: On 28 January 2014 02:09, Stephen Dubovsky smdubov...@gmail.com

[Emc-users] MPG ilowpass vs limit2/3

We have MPG 'banging' on two machines that are tuned fast and I just found the 'ilowpass' example fix online: http://linuxcnc.org/docs/html/examples/mpg.html Looks to be a FIR filter. I had actually found the 'limit2' and 'limit3' functions first to use as rate limiters when searching. There is

Re: [Emc-users] Conversion Suggesions?

Tex Steve (PMDX) have done a couple ball screw micromills. I go to the monthly meetings and have seen them;) I think Tex has to machine the nut a little to fit but they appear to work great. Might want to drop Steve a line again and see what they're doing if he doesn't pipe in here first. On

Re: [Emc-users] Acra CNC refit progress.

Im not sure I'd go that far (and Im an owner of both). NMTB/QC30 has positive drive but a R8 power drawbar absolutely whoops QC30 in tool change speed ease. Push button vs having to yank on a wrench both in and out. Its not really an improvement. SMD On Tue, Dec 10, 2013 at 12:10 PM, Dave

Re: [Emc-users] Acra CNC refit progress.

On Tue, Dec 10, 2013 at 1:50 PM, Dave Cole linuxcncro...@gmail.com wrote: I've got an Erickson QC30 on my Bridgeport CNC mill. R8 does not maintain any accurate Z reference after a tool change. Why? R8 uses a taper angle of 16.85deg. NMTB/QC30 uses 16.5943deg [both from wikipedia]. Both of

Re: [Emc-users] beaglebone black capeless CNC configuration

On Thu, Nov 14, 2013 at 3:10 PM, Maximiliano Fermín Córdoba m.f.cordoba...@gmail.com wrote: If the jitter is like the one Im facing now its useless. Why? Both the mechanical inertia of the motor and the pwm frequency might be well below your step rate. Odds are REALLY high the stepper

Re: [Emc-users] G33.1 probem

Just got an email from Zoro tools. 30% off *3 HOURS ONLY* today @ 11-2pm CST. Coupon 30NOW On Tue, Nov 5, 2013 at 11:07 AM, Dave Cole linuxcncro...@gmail.com wrote: I ordered some stuff from them yesterday late afternoon and I got a note that it was shipped at 7am this morning. So not

Re: [Emc-users] G33.1 probem

Hmm. I didn't know Zoro was owned by Grainger. Good to know! FWIW, they run a 25% off sale a couple times a year (up to $2000 IIRC.) I have bought a PILE of stuff from them on several occasions when they run those sales. IIRC, 5gal pails of Vactra/Velocite delivered for about 1/2 the price of

Re: [Emc-users] Scale ring engraving

W/ problem like these it seems simpler to me to create a custom configuration for the machine than to generate 'proper' g-code. Just generate the text/engraving in the XY plane (which is typ easy to do w/ lots of programs) and create a custom HAL file that drives the A axis motor from Y's

Re: [Emc-users] gcmc - G-Code Meta Compiler

a mil dot on a gun sight is one milliradian. It works out to 1m offset at 1000m (or 1yd @ 1000yd if so inclined but metric is easier.) On Thu, Oct 31, 2013 at 1:52 PM, andy pugh bodge...@gmail.com wrote: On 31 October 2013 17:18, Marius Liebenberg mar...@mastercut.co.za wrote: I always

Re: [Emc-users] Crowbars

Just wire the relay to the AC line. Connect the resistor to the COM NC contacts. Relay connects bleeder resistors when AC line is removed. No need to get fancy. Stephen On Wed, Oct 2, 2013 at 2:43 PM, Dave Cole linuxcncro...@gmail.com wrote: That could work as well. I thought this was

Re: [Emc-users] Motorman Robot with absolute Yaskawa encoders

Run physical signal to two pins? Encoder gpio. Encoder wont care about extra twiddling at start (and you're going to reset its counter anyway). Gpio (uart) doesn't care if you ignore its output later. SMD On Tue, Sep 10, 2013 at 1:50 PM, Rudy du Preez r...@asmsa.co.za wrote: I now realize

Re: [Emc-users] Planning phase for new machine, need decision support

Something to remember w/ steppers is that they produce no torque at rest. The maximum pullout torque is at 1/4 full step of error. W/ a typ 200 step motor thats 1/800th of a revolution. W/ a 0.2(5tpi) leadscrew like on a bridgeport that is 0.2/800= +-.00025 error depending on moving/cutting

Re: [Emc-users] Planning phase for new machine, need decision support

On Tue, Aug 6, 2013 at 9:41 AM, dave dengv...@charter.net wrote: Too early in the morning and still on first cup of coffee but: if you are within the 1/4 step (null) then increased feedback of some kind won't fix it. It does fix it. The feedback will cause the control loop to shift the

Re: [Emc-users] Monarch 10EE CNC conversion complete

Cecil, Very nice! Can you provide details pics of your nut catcher? I've thought of doing something along those lines to one of my lathes and would love to see how someone else implemented it! Thank you, Stephen On Mon, Aug 5, 2013 at 1:56 PM, Cecil Thomas wctho...@chartertn.net wrote: I

Re: [Emc-users] NSK vt150RAS1

Might have brought out both leads of each winding so it can be wired wye or delta. On Mon, Jul 29, 2013 at 6:12 PM, Curtis Dutton curtd...@gmail.com wrote: OOps I forgot to name all of the wires. A+ - Motor winding phase A+ A- B+ B- C+ C- REA - Resolver phase A excitation signal REB

Re: [Emc-users] emco compact 5pc lathe and linuxcnc

Sam, I also have three of these from a school (compact 5 cnc versions). One has the tool turret. I couldn't do the web documented stepper mod because my boards were of a different revision. So I bought some chinese stepper drivers and just converted one (longs_motor 4.2A DM542A). The orig

Re: [Emc-users] Automatic Homing Procedure with LinuxCNC

On Sun, Jul 7, 2013 at 4:08 PM, Charles Steinkuehler char...@steinkuehler.net wrote: Did I miss the manual section on setting up probing? G38 is probing. http://linuxcnc.org/docs/html/gcode/gcode.html#sec:G38-probe

Re: [Emc-users] PID Best Practices

The scaling is in the units of the input and output. You don't need to scale the output 100x as you could just use 100x smaller PID values. Integral gain should be in the form of output per second given one unit of input (though I don't know if LCNC normalizes the summing rate or you have to

Re: [Emc-users] PID Best Practices

On Thu, Jun 27, 2013 at 11:13 AM, Dave e...@dc9.tzo.com wrote: Your PID loop is likely running a lot faster than what is required. Agreed. The PID loop should run 10x to 50x the time constant of the control system. Any faster and you will end up with very small changes in tuning values

Re: [Emc-users] PID Best Practices

On Thu, Jun 27, 2013 at 3:33 PM, Dave e...@dc9.tzo.com wrote: Analog PID works at a (near) infinite rate. Yeah... when was the last time anyone worked on one of those. All the time. The VAST majority of switching power supplies out there are analog loops. Wall warts, all your computer

Re: [Emc-users] Image Burnt But CD Won't Boot

*NOT* ok:) You do NOT want to burn the image to a CD so that its still one file. It sounds like thats what you did since the checksum is the same. If you burn it to the CD correctly, the checksum ISN'T the same as there is no one file to even take a checksum on. It extracts into thousands of

Re: [Emc-users] Pendant recommendations

FYI, I did something similar to Jon and used only 2 wires for the 3 feed rates. Though, I left the smallest (X1) increment as the unconnected one to use as the default if one of the other two weren't active. So if the switch is between positions, flaky contact, broken wire, etc it defaults to

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