Homebrew PCBs

> ST >Another question, stainless
> ST> allthreads, are they really better for continous use?
> ST> i had to fasten some stainless nuts on stainless bolts a few 
days ago, 
> ST> there was more friction
> ST> than with rusting bolts/nuts. 


> DO  NOT  use the combination stainless/stainless! On one (not CNC) 
machine I
> had to cut the bound nuts. Better combination is stainless/brass.


A little more information on this is wanted.  I use SS nuts and bolts 
all the time.  some project requrie that.


As for the the question of a stainless leadscrew.  Here are some 
problems.

an oxidizing screw such as steel will need lubracation so as not to 
rust.  Rust will wear out the nut and the machine will loose accuracy.

lubricating such a shaft will create the problem of the lubricating 
oils picking up dust.  and the dust will become a problem.

a soft metal like brass will wear out from use.

Stainless is preferred because it eleminates many of these problems.

the note about not using a stainless leadscrew on a stainless nut is 
correct.  I preferr a nylon or some plastic type nut.  I find they 
are much better for a number of reasons.  and making your own is much 
easier.

Dave