Re: Ideas needed: techniques to reduce Z axis slop:

Hi Tim,
Yep, I think you are right( always the voice of reason :-)), but I
will switch over to that big DC servo and the G340 I've been sitting
on. That should give me back the speed too.

Plus I'm fighting junk measurement tools too for backlash. My DRO that
I defended prevoiusly, Escala II, ends up being way off in adjustment
from the factory and my not be that accurate overall. The scale
mounting is really flimsy and the rod inside can move. I think that
may be adding to my backlash measurement and someone awhile back
mentioned the same with this DRO brand.
Humbled,
-Lee




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tim Goldstein" <timg@k...>
wrote:

> Lee,
>
> Just reduce the pressure on the air assist on the knee and let some

of

> the table weight keep the bevel loaded on the same side of the

teeth. It

> will totally eliminate the backlash on the Z axis. The downside is

your

> Z axis speed will be reduced a little. The upside is it is free,

can be

> implemented immediately, and requires no modification to the

machine.

>
> Tim
> [Denver, CO]
> Sherline products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
> Now selling Visual Mill 4.0
>
>
> > -----Original Message-----
> > Hi Jon,
> > I like the idea to modify my quill for a ballscrew at some point.

I

> > also like the belt idea, but it will be hard to do, there's a

casting

> > around the knee ballscrew bevel gear, so it would be a major

machine

> > mod. I'm going to scope it out today to see how I might do that.

Also

> > I came up with a thrust bearing idea to push the bevels together

with

> > an adjustable spring tension that will be easy to implement, but

as

> > the bevels wear it may not last? I bet it will be ok for many

years

> > of my usage...
> >
> > -Lee