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need motor for CNC (sherline)
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walt smith
This is something I might try, but I still need a motor (right now I have to
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switch the motor back to the lathe when I want to use it and put it on the mill when I need it What I actuly have been doing is choping up my cuts into a bunch of subs and putting a pause in the control program so I can manuely feed/lift the milling head. The problem is I have paint twice for motors and bouth don't work. If it weren't that the motor from the lathe does work, I'd think there was a different problem. But if the lathe motor works, I should be able to find a new motor that will work--Ijust don't know a damn thing about stepper motors so I have no idea what to buy or from who (I don't want to go back to backtrack as they don't seem inclined to work with me on this) -----Original Message-----
From: Darrell [mailto:dgehlsen@...] Sent: Tuesday, July 11, 2000 5:00 PM To: CAD_CAM_EDM_DRO@... Subject: Re: [CAD_CAM_EDM_DRO] need motor for CNC (sherline) Also, if you have any backlash on Z, by counterbalancing a little heavy (so the Z motor has to push Z down) you could eliminate the backlash. Darrell Addresses: Post message: CAD_CAM_EDM_DRO@... Subscribe: CAD_CAM_EDM_DRO-subscribe@... Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@... List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@... Moderator: jmelson@... [Moderator] URL to this page: FAQ: bill, List Manager |
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Walt & Craig Smith
I have a sherline CNC set up from Backtrack. The Z axis motor is
shot (works with no load but just sits there "buzzing" when hocked up to the mill). I have pulled the motor off the lathe and it works in its place--so I think its a good bet that there is something wrong with the motor. This is the second motor I have had and Backtrack charged me over $160 for it. Now I see a LOT of fokes talking about a LOT of different motors-- and I don't understand much of it. So while I'm sure every thing I ever needed to kow is barried in other posts, can someone suggest what I need and where to get it? The motors I have have a mount that has holes spaced about 1 13/16 apart and a 1/4" shaft on both ends. the markings on the motor are- Mycom ps468-21B 5,4V 1,5A #9845 1.8 deg step and it has a 5 pin DIN male conector. I would like to possibly get something a little stronger as I have constanly screwed up parts when deep into the program the the G00 command dosen't lift the head (just sits and buzzes) and then the move command ends up feeding the tool into the part for a cut I don't want. Thanks! Craig |
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Jon Elson
Walt & Craig Smith wrote:
I would like to possibly get something a little stronger as I haveYup, here's the problem with an open-loop approach. Wasted materials and tools, and maybe even injury, not to mention wasted time! You might try just turning down the speed of the rapid feed a little. Jon |
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In a message dated 7/11/00 5:20:01 PM Mountain Daylight Time,
fom@... writes: << -Ijust don't know a damn thing about stepper motors so I have no idea what to buy or from who (I don't want to go back to backtrack as they don't seem inclined to work with me on this) >> Contact Dan at Camtronics, he will be able to help you I am sure, and also has steppers for sale if needed. bill |
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Darrell
> I would like to possibly get something a little stronger as I have constanly screwed up parts when deep into the program the the G00A counter balance (weight, cable and pulleys or a spring from the ceiling) so the Z motor is not lifting a big weight going up and then going free fall on the way down would not only fix your problem, it might even improve your speeds. Darrell |
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Paul Devey
Sounds like your stepper motor is too small. Check out Dan Mauch site. He
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should be able to get you a beefy double shafted motor. Paul -----Original Message-----
From: Walt & Craig Smith <fom@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Tuesday, July 11, 2000 9:21 AM Subject: [CAD_CAM_EDM_DRO] need motor for CNC (sherline) I have a sherline CNC set up from Backtrack. The Z axis motor isdiscussion of shop built systems, for CAD, CAM, EDM, and DRO.
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Darrell
Also, if you have any backlash on Z, by counterbalancing a little heavy (so
the Z motor has to push Z down) you could eliminate the backlash. Darrell fall> I would like to possibly get something a little stronger as I have on the way down would not only fix your problem, it might even improveyour speeds.discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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Alan Marconett KM6VV
Hi Walt,
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You might want to check your PC's date. Y2K might have got you (msg date 98?). And could you just order another "lathe" motor, if that works? good luck! Alan walt smith wrote:
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I will join the fray that says to get a new motor from Dan at Camtronics
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Here is his NEMA 23 listing from on his products page. Part Number Leads Holding Torque Amperage Price 23-019 8 75 oz in .7 $55 23-020 8 73 1.5 $55 23-032 8 126 1.36 $85 I would personally go with the 126 in/oz unit, but then again I am know for always wanting more power! While I was looking at Dan's site for the motors I noticed the following: NEW! SINK- ELECTRICAL DISCHARGE MACHINING. Plans for this beatifully done Computer Controlled SEDM machine are now available. The plans are the best I have seen to date. Camtronics is delighted to be the distributor of these plans. The manual contains 80 pages of drawings, pictures, theory, and instructions on building an S-EDM. Check out the pictures in the image section of this web page. Look for the prcing and additional information about the CNC S-EDM in our products section. OK Dan, tell us more about it. Tim [Denver, CO] -----Original Message----- |
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