Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
--- On Thu, 4/4/13, John Stewart alex.stew...@crc.ca wrote: I'm looking for ideas here. A Unimat SL1000, MK1 landed on my desk last Saturday. It's mine if I want it. Have been thinking of taking some of my CNC parts kicking around home and using them, but I don't think using a 5i25 + 7i76 + Nema 34 steppers is great. So, with a little lathe like this, if I go with NEMA 17 3D Printer steppers (think Reprap or one of the Thingverse machines), what would be the best, least expensive way of driving these steppers from a LinuxCNC setup? Even 17's would dwarf that Unimat. I'd try some motors from printers or old 5.25 full height floppy drives. I just happen to have a pair of Tandon single sided 5.25 drives I've been trying to give away for a while. ;) Had them on a TI-99/4A years ago before upgrading to double sided drives. The drive motors for spinning the disks might also be useful for micro CNC with encoders added. I think they have tachometers built in. Even cooler would be using the motor control boards from the drives. They do step and direction for the head steppers and on/off for the drive motors. 'Course they have rather poor resolution with only 40 normally accessible steps, though that's not a hard limit, there was software for increasing the number of tracks on disks for some computers. I wonder if it'd be possible to hack the control board (which is separate from and much smaller than the data read/write board) to work as a more general purpose one? Microstepping might be a bit much to add. There was a site that showed using the boards and motors from a pair of floppy drives to build a robot, but it vanished. -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
You could use a Gecko G510 for a tidy little package. You could use a NEMA17 to drive the spindle as well as X and Z, then you could have a C axis and amaze people with tricks like machining offset lobes on a cam, or use a flex-shaft Dremel-type tool for live tooling. -- Ralph From: John Stewart [alex.stew...@crc.ca] Sent: Thursday, April 04, 2013 4:55 AM To: Enhanced Machine Controller (EMC) Subject: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe Cecil Thomas mentioned in another thread that he'd cnc'd a watchmakers lathe. I'm looking for ideas here. A Unimat SL1000, MK1 landed on my desk last Saturday. It's mine if I want it. Have been thinking of taking some of my CNC parts kicking around home and using them, but I don't think using a 5i25 + 7i76 + Nema 34 steppers is great. So, with a little lathe like this, if I go with NEMA 17 3D Printer steppers (think Reprap or one of the Thingverse machines), what would be the best, least expensive way of driving these steppers from a LinuxCNC setup? Do the C10 boards, as shown in www.automationtechnologies.com's stepper motor kits work with LinuxCNC? I expect this little lathe to be a toy or demo lathe; take it along to shows, etc, and have it run making little brass swarf piles. I do have a computer put together with 5I25 and an Intel D525MW motherboard waiting to sit beside my larger CNC lathe build, so I could use that for computer horsepower. Thoughts? Thank you; -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
On 4/4/2013 9:02 AM, Gregg Eshelman wrote: There was a site that showed using the boards and motors from a pair of floppy drives to build a robot, but it vanished. Google returns plenty of hits on the search phrase floppy stepper robot. If you remember the URL of the vanished site (and you don't see something substantially similar in the Google list), you could look for it on the Wayback Machine at archive.org. Over the years this site has become indispensable to me as technical folks abandon their websites for whatever reason. Not everything gets archived but the Wayback Machine is always my first stop after looking for cached pages on Google. Regards, Kent -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
least expensive is a Ebay driver with built in BOB like http://www.ebay.com/itm/3-Axis-TB6560-CNC-Stepper-Motor-Driver-Controller-Board-/130532311197?pt=LH_DefaultDomain_0hash=item1e6455009d that was just a quick grab, shop around ebay and find the best fit for price location and shipping cost. if you need a power supply you can also get if from ebay, some times even from the guy your getting the driver from. look at the what else the supplier of the drive has for sale, most times you can save on shipping that way. On 4/4/2013 4:55 AM, John Stewart wrote: Cecil Thomas mentioned in another thread that he'd cnc'd a watchmakers lathe. I'm looking for ideas here. A Unimat SL1000, MK1 landed on my desk last Saturday. It's mine if I want it. Have been thinking of taking some of my CNC parts kicking around home and using them, but I don't think using a 5i25 + 7i76 + Nema 34 steppers is great. So, with a little lathe like this, if I go with NEMA 17 3D Printer steppers (think Reprap or one of the Thingverse machines), what would be the best, least expensive way of driving these steppers from a LinuxCNC setup? Do the C10 boards, as shown in www.automationtechnologies.com's stepper motor kits work with LinuxCNC? I expect this little lathe to be a toy or demo lathe; take it along to shows, etc, and have it run making little brass swarf piles. I do have a computer put together with 5I25 and an Intel D525MW motherboard waiting to sit beside my larger CNC lathe build, so I could use that for computer horsepower. Thoughts? Thank you; -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
On Thursday 04 April 2013 09:23:01 Gregg Eshelman did opine: --- On Thu, 4/4/13, John Stewart alex.stew...@crc.ca wrote: I'm looking for ideas here. A Unimat SL1000, MK1 landed on my desk last Saturday. It's mine if I want it. Have been thinking of taking some of my CNC parts kicking around home and using them, but I don't think using a 5i25 + 7i76 + Nema 34 steppers is great. So, with a little lathe like this, if I go with NEMA 17 3D Printer steppers (think Reprap or one of the Thingverse machines), what would be the best, least expensive way of driving these steppers from a LinuxCNC setup? Even 17's would dwarf that Unimat. I'd try some motors from printers or old 5.25 full height floppy drives. I just happen to have a pair of Tandon single sided 5.25 drives I've been trying to give away for a while. ;) Had them on a TI-99/4A years ago before upgrading to double sided drives. The drive motors for spinning the disks might also be useful for micro CNC with encoders added. I think they have tachometers built in. They would probably be pretty puny for x-z drives even on that small a lathe. They were normally belted to the spindle, and belt slippage on the lathe would destroy any accuracy unless you also put scales on it. The 17 class steppers might be overkill. but at least you can microstep them. Even cooler would be using the motor control boards from the drives. They do step and direction for the head steppers and on/off for the drive motors. 'Course they have rather poor resolution with only 40 normally accessible steps, though that's not a hard limit, there was software for increasing the number of tracks on disks for some computers. Steps available are virtually unlimited. The driver SW in the computer usually steps them outward, either until it hits a mechanical limit sits there hammering the stop till enough steps have been issued that the computer knows it has to be at track zero ( racket you hear at bios bootup from any pc with a floppy in it, or if fancy driver, the track zero switch closes to indicate its at track zero. Stepping the other way is limited in the drive by the head carriage hitting the spindle mechanics but if that limit is removed, there is not any other limit. The biggest problem will be the low voltage it runs on. The disk drives board will fail at the voltages we commonly use for steppers, even the toy stuff we generally use is 24 volts, and that is enough to cook the floppy board because they do not chop for current control, they power up, do the step and shut the current off 40 milliseconds or so later if no more steps come in since there is not any torque pushing on them, the normal steppers cogging is sufficient holding power. The next problem is the speed they can step. At the voltages they do run at, and at no more mass than they have to move, the maximum step rate is nominally 6 ms per step. Mechanically geared down for accuracy, that is not going to be very fast at all. Synopsis: Look for a small chinese stepper board that can microstep with chopper controlled current, and hit the surplus places looking for 4 wire, not more than 12 volt, probably $12 or so, steppers. I have a few, rated at 24 volts, which means they'd be pretty slow on 24 volts, but I didn't buy them for motors, but as generators, turned by hand they output a nice pulse for a jog pendent. But my round tuit came up missing. :) Those head steppers out of the old tandon's that drive the head carriage via the thin steel tape, can be made to put out considerably more torque, and faster by 5x or so, if driven by a xylotex board and a 24 volt supply. But the xylotex board doesn't do idle current reduction, just on off via the enable pins, so the motor temps need to be watched. Getting that alu tape drum off the shaft so you can fit something else is a problem, they are pressed on, interference fitted. Interesting what if problem. :) I wonder if it'd be possible to hack the control board (which is separate from and much smaller than the data read/write board) to work as a more general purpose one? Microstepping might be a bit much to add. Not practical at all. There was a site that showed using the boards and motors from a pair of floppy drives to build a robot, but it vanished. No wheels there that we can't reinvent if needed. :) Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) My web page: http://coyoteden.dyndns-free.com:85/gene is up! My views http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml ... My pants just went on a wild rampage through a Long Island Bowling Alley!! A pen in the hand of this president is far more dangerous than a gun in the hands of 200 million law-abiding citizens. --
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
Hmm - lots of very good thoughts and suggestions so far, obviously lots of out of the box thinkers here as expected. I do have two colleagues who are unabashed hoarders of stuff, so maybe I'll ask them about stepper motors. Ralph: You could use a Gecko G510 for a tidy little package. You could use a NEMA17 to drive the spindle as well as X and Z, then you could have a C axis and amaze people with tricks like machining offset lobes on a cam, or use a flex-shaft Dremel-type tool for live tooling. If you mean the G540 - I use one on my Sieg KX1-NU mill, and it works really well with the Mesa 5i25. Hmmm - replace the motor with a stepper - there is the stepper head build going on in Model Engineers Workshop, so this is an interesting idea. The little Unimats are not very solid, IIRC (I had one as a teenager in the '70s), but this one is a shorter bed, so maybe might be stronger? (less flex in the bed rods, I'd assume) I can see this little weekend warrior project turning into something rather larger! ;-) JohnS. -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
http://www.circuitspecialists.com/stepper-motor they have small steppers, down to NEMA 11, if you look around you can find NEMA 8 as well, remember that torque drops fast the smaller you go so you may want to watch that your motor is not under powered, you may have to gear it down. sound like a fun project On 4/4/2013 7:40 AM, John Stewart wrote: Hmm - lots of very good thoughts and suggestions so far, obviously lots of out of the box thinkers here as expected. I do have two colleagues who are unabashed hoarders of stuff, so maybe I'll ask them about stepper motors. Ralph: -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
Getting that alu tape drum off the shaft so you can fit something else is a problem, they are pressed on, interference fitted. I think I'd try a nutcracker. Sent from my Kyocera Rise Gene Heskett ghesk...@wdtv.com wrote: On Thursday 04 April 2013 09:23:01 Gregg Eshelman did opine: --- On Thu, 4/4/13, John Stewart alex.stew...@crc.ca wrote: I'm looking for ideas here. A Unimat SL1000, MK1 landed on my desk last Saturday. It's mine if I want it. Have been thinking of taking some of my CNC parts kicking around home and using them, but I don't think using a 5i25 + 7i76 + Nema 34 steppers is great. So, with a little lathe like this, if I go with NEMA 17 3D Printer steppers (think Reprap or one of the Thingverse machines), what would be the best, least expensive way of driving these steppers from a LinuxCNC setup? Even 17's would dwarf that Unimat. I'd try some motors from printers or old 5.25 full height floppy drives. I just happen to have a pair of Tandon single sided 5.25 drives I've been trying to give away for a while. ;) Had them on a TI-99/4A years ago before upgrading to double sided drives. The drive motors for spinning the disks might also be useful for micro CNC with encoders added. I think they have tachometers built in. They would probably be pretty puny for x-z drives even on that small a lathe. They were normally belted to the spindle, and belt slippage on the lathe would destroy any accuracy unless you also put scales on it. The 17 class steppers might be overkill. but at least you can microstep them. Even cooler would be using the motor control boards from the drives. They do step and direction for the head steppers and on/off for the drive motors. 'Course they have rather poor resolution with only 40 normally accessible steps, though that's not a hard limit, there was software for increasing the number of tracks on disks for some computers. Steps available are virtually unlimited. The driver SW in the computer usually steps them outward, either until it hits a mechanical limit sits there hammering the stop till enough steps have been issued that the computer knows it has to be at track zero ( racket you hear at bios bootup from any pc with a floppy in it, or if fancy driver, the track zero switch closes to indicate its at track zero. Stepping the other way is limited in the drive by the head carriage hitting the spindle mechanics but if that limit is removed, there is not any other limit. The biggest problem will be the low voltage it runs on. The disk drives board will fail at the voltages we commonly use for steppers, even the toy stuff we generally use is 24 volts, and that is enough to cook the floppy board because they do not chop for current control, they power up, do the step and shut the current off 40 milliseconds or so later if no more steps come in since there is not any torque pushing on them, the normal steppers cogging is sufficient holding power. The next problem is the speed they can step. At the voltages they do run at, and at no more mass than they have to move, the maximum step rate is nominally 6 ms per step. Mechanically geared down for accuracy, that is not going to be very fast at all. Synopsis: Look for a small chinese stepper board that can microstep with chopper controlled current, and hit the surplus places looking for 4 wire, not more than 12 volt, probably $12 or so, steppers. I have a few, rated at 24 volts, which means they'd be pretty slow on 24 volts, but I didn't buy them for motors, but as generators, turned by hand they output a nice pulse for a jog pendent. But my round tuit came up missing. :) Those head steppers out of the old tandon's that drive the head carriage via the thin steel tape, can be made to put out considerably more torque, and faster by 5x or so, if driven by a xylotex board and a 24 volt supply. But the xylotex board doesn't do idle current reduction, just on off via the enable pins, so the motor temps need to be watched. Getting that alu tape drum off the shaft so you can fit something else is a problem, they are pressed on, interference fitted. Interesting what if problem. :) I wonder if it'd be possible to hack the control board (which is separate from and much smaller than the data read/write board) to work as a more general purpose one? Microstepping might be a bit much to add. Not practical at all. There was a site that showed using the boards and motors from a pair of floppy drives to build a robot, but it vanished. No wheels there that we can't reinvent if needed. :) Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) My web page: http://coyoteden.dyndns-free.com:85/gene is up! My views http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml ... My pants just went on a wild rampage through a Long Island
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
I used Gecko 320's with no breakout board to drive the X, Z and spindle. I had converted my millrite to CNC after I found some large (4 diameter x 6) 30 volt motors that had an encoder shaft but no encoder. With the big motors on hand and the encoders given to me by a friend the step and direction servo setup was the most economical at the time. The watchmakers lathe X and Z are some tiny little servos that a friend gave me (originally so I could cannibalize the encoders but that's another story) The spindle is driven with a timing belt and a larger servo. I run all my threading programs on the little lathe as if the spindle were an A axis. I used this setup because I had the servo, I had written X,Y,Z,A programs to thread on my Millrite, and the g33, g76 threading with an indexed spindle was not that clear in my mind and I didn't have an index on the spindle motor. The only real problem in using x,z,a with a axis spindle is the need to unwind the spindle after every pass. That's not a large problem when you are cutting a 00-90 thread .1 inches long. I'd be happy to upload some pictures of my little lathe but I am not familiar with the uploading sites. Could someone recommend a good no hassle site? Cecil -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
On 4 April 2013 23:06, Cecil Thomas wctho...@chartertn.net wrote: The spindle is driven with a timing belt and a larger servo. I run all my threading programs on the little lathe as if the spindle were an A axis. I used this setup because I had the servo, I had written X,Y,Z,A programs to thread on my Millrite, and the g33, g76 threading with an indexed spindle was not that clear in my mind and I didn't have an index on the spindle motor. You can probably add an index to the spindle and set up for G76 etc. The motor encoder and belt ratio will give an unusual number of counts per rev, but it's just a number and computers don't care. However, you do need one index per _spindle_ rev to do G76 threading. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
I have recently converted a jet 9x20 to CNC using gearhead servos on the x and z and a treadmill motor on the spindle. I made my spindle encoder out of a CD with 20 notches with one deeper than the rest. I read the counts with active electronic optical interrupters so the output is clean and full voltage. I have A, B and Z encoders so I get 80 counts per rev which I think is plenty good enough and doesn't cause crazy high count rates at high spindle speeds. I control the spindle speed with PWM through another optical interrupter for isolation. I actually do my threading with g33 because it was so easy to rewrite my threading programs from servo spindle to indexed spindle. I am very comfortable with my threading program because it works referenced to the outer diameter of the stock or the inner diameter of an internal thread which is the way I think. Also since it's my code I can modify it any time for any reason. For the little lathe... it works just fine so I'll leave it alone and start working on adding x and Z motors on my newly acquired Monarch 10ee. Before I start getting rotten tomatoes thrown at me for doing such a travesty I must note that this machine is what is called a base model. it left the factory with no lead screw, no change gears and no way to add them back even in the unlikely event that I could find them. There is also no taper attachment. So why would I ever buy such a machine??? I didn't. It was a gift. I've sunk about $200 into a rotary converter with idler(no need for variable speed) and I think I can add a ball screw and servo to the Z and a servo to the x for less than $400. Must look into Mesa servo drives. Cecil You can probably add an index to the spindle and set up for G76 etc. The motor encoder and belt ratio will give an unusual number of counts per rev, but it's just a number and computers don't care. However, you do need one index per _spindle_ rev to do G76 threading. -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
For the little lathe... it works just fine so I'll leave it alone and start working on adding x and Z motors on my newly acquired Monarch 10ee. Before I start getting rotten tomatoes thrown at me for doing such a travesty I must note that this machine is what is called a base model. it left the factory with no lead screw, no change gears and no way to add them back even in the unlikely event that I could find them. There is also no taper attachment. So why would I ever buy such a machine??? I didn't. It was a gift. I've sunk about $200 into a rotary converter with idler(no need for variable speed) and I think I can add a ball screw and servo to the Z and a servo to the x for less than $400. Must look into Mesa servo drives. Cecil no the tomatoes are for scoring this retrofitable king of machines :) On Thu, Apr 4, 2013 at 10:52 PM, Cecil Thomas wctho...@chartertn.netwrote: I have recently converted a jet 9x20 to CNC using gearhead servos on the x and z and a treadmill motor on the spindle. I made my spindle encoder out of a CD with 20 notches with one deeper than the rest. I read the counts with active electronic optical interrupters so the output is clean and full voltage. I have A, B and Z encoders so I get 80 counts per rev which I think is plenty good enough and doesn't cause crazy high count rates at high spindle speeds. I control the spindle speed with PWM through another optical interrupter for isolation. I actually do my threading with g33 because it was so easy to rewrite my threading programs from servo spindle to indexed spindle. I am very comfortable with my threading program because it works referenced to the outer diameter of the stock or the inner diameter of an internal thread which is the way I think. Also since it's my code I can modify it any time for any reason. For the little lathe... it works just fine so I'll leave it alone and start working on adding x and Z motors on my newly acquired Monarch 10ee. Before I start getting rotten tomatoes thrown at me for doing such a travesty I must note that this machine is what is called a base model. it left the factory with no lead screw, no change gears and no way to add them back even in the unlikely event that I could find them. There is also no taper attachment. So why would I ever buy such a machine??? I didn't. It was a gift. I've sunk about $200 into a rotary converter with idler(no need for variable speed) and I think I can add a ball screw and servo to the Z and a servo to the x for less than $400. Must look into Mesa servo drives. Cecil You can probably add an index to the spindle and set up for G76 etc. The motor encoder and belt ratio will give an unusual number of counts per rev, but it's just a number and computers don't care. However, you do need one index per _spindle_ rev to do G76 threading. -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- jeremy youngs -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Cecil Thomas - CNC'd Watchmakers Lathe
That would be a sweet machine man, MONARCH CNC!! A real nice 10EE is a thing of beauty for sure. Once I get this Cincinnati Arrow 500 retrofit completed and hopefully making me some cash I would like to find a nice older Cincinnati slant bed or maybe a CHNC Harding's lathe to retrofit to complement my mill. I have decent 12x36 manual lathe here but would really like to have a nice CNC lathe. Gotta be a nice capacity and still be small enough to run on single phase power like the Arrow. Maybe 7.5-10 On Thursday, April 4, 2013, jeremy youngs jcyoung...@gmail.com wrote: For the little lathe... it works just fine so I'll leave it alone and start working on adding x and Z motors on my newly acquired Monarch 10ee. Before I start getting rotten tomatoes thrown at me for doing such a travesty I must note that this machine is what is called a base model. it left the factory with no lead screw, no change gears and no way to add them back even in the unlikely event that I could find them. There is also no taper attachment. So why would I ever buy such a machine??? I didn't. It was a gift. I've sunk about $200 into a rotary converter with idler(no need for variable speed) and I think I can add a ball screw and servo to the Z and a servo to the x for less than $400. Must look into Mesa servo drives. Cecil no the tomatoes are for scoring this retrofitable king of machines :) On Thu, Apr 4, 2013 at 10:52 PM, Cecil Thomas wctho...@chartertn.net wrote: I have recently converted a jet 9x20 to CNC using gearhead servos on the x and z and a treadmill motor on the spindle. I made my spindle encoder out of a CD with 20 notches with one deeper than the rest. I read the counts with active electronic optical interrupters so the output is clean and full voltage. I have A, B and Z encoders so I get 80 counts per rev which I think is plenty good enough and doesn't cause crazy high count rates at high spindle speeds. I control the spindle speed with PWM through another optical interrupter for isolation. I actually do my threading with g33 because it was so easy to rewrite my threading programs from servo spindle to indexed spindle. I am very comfortable with my threading program because it works referenced to the outer diameter of the stock or the inner diameter of an internal thread which is the way I think. Also since it's my code I can modify it any time for any reason. For the little lathe... it works just fine so I'll leave it alone and start working on adding x and Z motors on my newly acquired Monarch 10ee. Before I start getting rotten tomatoes thrown at me for doing such a travesty I must note that this machine is what is called a base model. it left the factory with no lead screw, no change gears and no way to add them back even in the unlikely event that I could find them. There is also no taper attachment. So why would I ever buy such a machine??? I didn't. It was a gift. I've sunk about $200 into a rotary converter with idler(no need for variable speed) and I think I can add a ball screw and servo to the Z and a servo to the x for less than $400. Must look into Mesa servo drives. Cecil You can probably add an index to the spindle and set up for G76 etc. The motor encoder and belt ratio will give an unusual number of counts per rev, but it's just a number and computers don't care. However, you do need one index per _spindle_ rev to do G76 threading. -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- jeremy youngs -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html ___ Emc-users mailing list
