Thompson Siginaw screw, opinions?

[Bluesman]

Originally Posted by phantomcow2 maybe I will try it for my Z axis. Ive got some nice duplex bearings i need to use up, its a good excuse to machine some bearing blocks. The website says it has .004"/ft accuracy. Considering my Z is probably half of that, I can live with that figure.

But Remember the .004 is the lead accuracy, You still have a bout the same amount in backlash. But for a gravity axis that may not matter. As long as you know the spec,s then if it is all you require, Then I would say you are all set.
I am acually looking at the same assembly for a project that I am working on. But all I got to do is lift

Bluesman

[phantomcow2]

Yea i see they say .001-.004 for backlash. As long as backlash is consistent i don't care. Thats what is making me want to look at ballscrews. My current setup allows for no adjustement in the Z axis for backlash, and it wears and backlash increases, its definantly at more than .004 now. My hopes are that a ballscrew will be consistent, i dont expect it to retard wear, but i do expect if it has .003 or whatever, it stays that way for much longer than a 60 deg thread.
The rest is all software comp

[H500]

I haven't measured it, but the assembly I got from mcmaster seem to have about .01 backlash. Its very loose. I intend to use 2 ballnuts to get rid of it.