Re: ball screw preferences

Hello Mark,

You might get more damage with them too loose as opposed to too
tight. Too loose and a big machine will "bang them around" in the
slop...

It's a pretty safe bet IMO that a machine using the parts you've
described is designed for the end mounts to be tight and take the
loads imposed.

Keep in mind that some high load linear bearings will seem VERY
stiff when they are NOT loaded. (Mentioned as a "parallel" thought)

IOW, what seems too tight to YOU (feeling by hand) might be exactly
what's needed to prevent damage when a heavy axis changes direction
at speed.

static vs. dynamic loads and effects...

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mark Vaughan" <mark@...>
wrote:

>
> Thanks Ballendo
>
>
>
> Never thought about the market that way, seems silly now. I see

loads of

> catalogues full of motion stuff, and brain had taken the thought,

strange

> don't seem to see many CNC people, must be because I live in a

remote area

> of the country, rather than other just use them to move things.

I've got to

> get some more grey matter.
>
>
>
> All my end thrust races are adjustable with ground thrust washers

and radial

> bearings. I normally tighten these by hand so they move without

feeling the

> rollers, but there is a little play here. My experience on the

ball screw is

> that you can feel the ball movement, when the nuts are set

together. Perhaps

> I need to tighten the end races a little more. Then again I don't

need any

> more accuracy, and I'd rather not damage the races so probably

best leave

> where it is.
>
>
>
> Thanks Again
>
>
>
> Regs Mark
>
>
>
> PS I'll trim this one, I forget as well, get into the message,

then someone

> is pestering for attention, kids customer etc, and you hit send.
>
>
>
> Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
>
> Managing Director
>
> Vaughan Industries Ltd, reg in UK no 2561068
>
> Water Care Technology Ltd, reg in UK no 4129351
>
> Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
> Phone/Fax 44 1872 561288
>
> _____
>
>
>
> [Non-text portions of this message have been removed]
>