Ball Screw Nuts

Pro 5 replacement Ball Screw Nuts. I am not confident in the longjevity of the ball screw nuts. I have noticed some shaking on the x axis with rapid chage of direction, possiby due to the rod not actually being fixed by a bushing or bearring in the non drive sde. Yes I understand the screw and nut is held in place by the rails at the gatary. Same with the y axis.

I have about 100 hours on the machine and expect to triple that in the next 12 months.

The ball nut reads SFAXR1620-1a which is impossible to find except in china and then only the nut not the wiper. What I find is SFU1620 In several lenghts I measure 59mm body end to end. I think I coud

I have sent an email to sales for spars waiting for reply.

This is a non standard off the shelf ball screw, nut and wipper. 16mm 20 pitch.

If anyone has thoughts about replacements let me know, or maybe you found something.

The ball screw only needs to be retained at one end, that’s where the angular contact bearings live and provides the reference position for the ball screw. In some cases a second bearing is installed at the undriven end, but typically this is just a simple radial bearing which stops the end of the ballscrew whipping about. It’s not easy or cheap to effectively design a machine with both ends of the ballscrew held radially and axially (along the length) without creating more problems than you solve.

Support will be the best place for parts, I wouldn’t expect the screw to be worn after 100 hours, without some environmental factors.

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waiting for a reply about replacements. Its not time tyyo replace thhe nuts but when necessary will ai have to rebuild them or go through hoops to find them.

Yes all of these screws hve whip and unnecessary vibration. a small bronze bushing would have been nice rather than an open hole.

Then measure the existing retainer on the non drive side. And either make a replacement for a bearing or a bushing if you’re worried about it.

You have a machine that is more than capable of making them out of aluminum.

If you would like information on replacement parts cost wait for the email response.

The undriven end is free floating in the retainer on my SP5.

there is no bushing just a hole that is a ?. You dont even need the bracket to operate the machine. I could mae a oil busing on my lathe.

Anyway its not bushing or the whiping on all axis that I worry about but replacement parts. As I said this ball screw is not a find it locally ball screw nut.

options are order an $80 nut from china with no wipers. Rebuild the nuts with larger bearring when it gets loose. Hope Carbide 3d has replacements as spares. Move up to 20mm screws and modify.

So far no firm reply from service. I guess I am the first to ask.

As for the great bushing debate you cant put a bushing in plastic. I took a look today.

Which is exactly why comment to make an aluminum bracket for it.

according to support they do not stock replacement parts?

I guess if you wear out a part you are on your own. Dumb way to run a business.

I ordered a ball screw from china. I guess i have to give them my money directly. certianly makes my decision to buy this machine seem less satisfying now.