Screw end bearings

[justCNCit]

What setup do most of you wood router people usually use as bearings for the ends of your ACME screws?

Am I right by guessing you use just a regular rotary bearing with shaft collar locks?

[justCNCit]

This is the only remaining piece of the puzzle for this m/c.

Somebody please give me a hand and point me in the right direction, I think I know which ones to use but am not sure. Have to design it before putting it together.

[Zumba]

Angular contact.

[Armstrong]

I use angular contact. I hope that helps. Good luck to your project.

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[SORCHEROR]

what i did was simple.my lead screws where 1/2-10,so i got 1/2 diameter I.D. angular contact bearings to slit over the outer dia. of the lead screw,than used some 1/2-10 acme nuts on each side of the bearings to lock them on the screw,the nuts need one side faced down smaller so not to rub on the outer race,works great,you dont have to turn down and rethread the end of the lead screw, you could use collars,but nuts are way better,i used locktight and drilled one set screw in the nuts also,you only need to do this on one end,the other end of the screw just needs one bearing to support it from whipping,the motor end i used two bearing,put a washer between them,(with a O.D. smaller than the bearings outer race),this way the bearing are spaced,than you can tight the two nuts fully and lock them,than you sandwich the outer races between two peices and tighten them until there no play in the bearings,i used one plate and screwed it agaisnt the router frame,so the frame was my other plate,works great,and its simple
steve

[SORCHEROR]

enco and MSC have them on sale very cheap,check it out

[ger21]

Here's what I did.
http://www.cnczone.com/forums/showpo...5&postcount=83

[sdantonio]

I did pretty much the same thing as Gerry. I'm thinking of replacing the bolts with locking shaft collars and possible seeing if I can replace the while thing with flange bearings, though these may be a little to stiff.

[bclark6716]

The guy at dumpsterCNC makes a threaded locking collar. I think this gives the best of both worlds.

Brian

[sdantonio]

Thanks Brian. Joe of the Joe machines just told me the same thing. I tried Dumpsters new site, but no pictures yet (all broken links).

[justCNCit]

I don't like those setups. The way I understand it is that you are to have a combination axial & radial load bearing, but these angular contact bearings are not thrust they are semi-angular.

I figured that tapered roller bearings would be the proper way to do it. Why did you all use angular instead? Plus, if you do use those, you have the problem of added friction on the thrust/axial part of the bearing, even if it can take the axial load you are adding alot of extra unnecessary turning friction.

That makes no sense to me.

[ger21]

I did it my way because it was less than $5. Nook uses angular contact in their very expensive blocks. Also, I think I read a few weeks ago that tapered rollers have more friction because the ends of the rollers are actually sliding.