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One last attempt before i go ballscrew

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One last attempt before i go ballscrew

Old 09-14-05, 07:10 PM
la vache fantôme
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One last attempt before i go ballscrew

I am trying to get the backlash under control for my milling machine.
CUrrent it has 3-8 thou of backlash depending on which axis you speak about. The problem is that the backlash is not always consistent, so the backlash compensation for my cnc controller is not always going to cut it.
I can get ballscrews at a very good price which will greatly reduce backlash, I dont need a heck of alot of screw since this is not a large mill so its affordable witht he price i will get.
But before i do that I really want to take one last stab at keeping these leadscrews so i drew up an anti-backlash nut i could make. Tell me what you think

The red is the area that would normally cause the backlash. The black represents a nut.
THe red spiral connecting the two is a semi powerful spring pushing them apart, so that the nut is always contacting the screw. Most of these backlash adjusting systems use a similar system but you have to keep manually adjusting the follower nut to compensate for the screw wearing. The spring would hopefully take care of that.
I dont see why this would not work, am i overlooking something?
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Old 09-14-05, 09:53 PM
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Can you sketch something better on where it would be used? Like an overhead view but further "zoomed out" than your current sketch?
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Old 09-15-05, 06:27 AM
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It should work fine, many anti-backlash lead screw setups use this scheme.

The trick its to get the spring just the right strength so it is strong enough that it will not compress while the mill is cutting, but not be so strong it causes too much drag between the nut and screw.

Take a peek:

http://www.cbmind.com/backlash.htm (actually a split nylon nut that compresses against the polished metal lead screw. I have a sample of one of these in a five-start lead screw in my desk!)

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