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Some pictures of a retrofit
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Rich
Group,
I was talking to a manufacture of a CNC controller and they invited me to come to their shop and look at a HF mill that had been retrofit. This weekend I was trying to figure out how the free web storage space, from my provider, worked . Here are some pictures I took with my Sony Camera: . Their setup looks fairly simple. So much so I think will try to retrofit rather than buy one of the small CNC mills. Perhaps, someone else on the list will find the pictures helpful. Rich |
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I notice that those stepper motors were 150 ox in motors. I would suggest
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300 oz inches would be better. I put those (300) on my retrofit and they worked very well. One other thing you may want to do is the replace the X-Y leadscrews with ballscrews. On my mill drill I found the original acme lead screws had a pitch error of .001 per in and .02 back lash. With ballscrews I have <.002 and the pitch is right on. I also solved the mill drill quill backlash problem (.02) by modifying the pinion shaft and making some simple eccentric bushing for the pinion shaft. I have a write up on it somewhere. It was easier than adding ballscrews to drive the quill. Dan -----Original Message-----
From: Rich <ibrich2000@...> To: CAD_CAM_EDM_DRO <CAD_CAM_EDM_DRO@...> Date: Sunday, May 07, 2000 4:12 PM Subject: [CAD_CAM_EDM_DRO] Some pictures of a retrofit discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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I checked out the pictures at Rich's link. I am still confused on
the Z axis conversion of these mini mills. How do you deal with that much backlash? Are they just drilling holes and are not that concerned with Z lash? The Z on my mill gets a double dose of error. Once through the worm, then once trough the rack and pinion to the quill. Plus alot of the import worm gears are really not "true" inch (according to HSM article) which can cause error to propogate. Don't get me wrong, I thought the pics were great, I just want to get more accuracy out of Z. Peace Joe V. |
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Peter Smith
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----- Original Message -----
From: Rich <ibrich2000@...> To: CAD_CAM_EDM_DRO <CAD_CAM_EDM_DRO@...> Sent: 08 May 2000 00:15 Subject: [CAD_CAM_EDM_DRO] Some pictures of a retrofit Rich I have retrofitted a similar machine, did you ask them what they had done about backlash in the Quill drive, or if they had fitted Ballscrews or at least adjustable feednuts on the X and Y axis. I had to make adjustable nuts and recut the feedscrews down to 3/4" dia, I have text/ drawings of this if you require them. Let me know offlist if you want pics. Best Wishes Peter Smith discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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