Re: Acme, ball screw or rack for wood router?

Dave,


Sure screw (or way) chamber pressurization works well, but its just a
further complication to machine design when dust tolerant drive
mechanisms are easy and simple. As far as woodworkering goes .001" or
.002" is generally much finer than we ever need to go. In fact timber
movement due to humidity changes in the timber itself negate most if
not all of the need for ultra precision timber machining. e.g. A
precisely machined tenon can swell up a thou or so virtually
immediately glue is applied to it.




Regards


Bob Thomas






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

> The word that gets my attention is dust extraction. What about

screw

> chamber pressurization ? Seems that if you really needed to use

ball

> screws, installing them in a simple chamber with some sort of

plastic

> guard.


>


> Thinking a thin piece of plastic that moved as the carrage did.


>


> Dave


>


>


>


>


>


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "echnidna" <echnidna@y...>


> wrote:


> > There will always be some superfine dust around no matter how good


> > your dust extraction system is.


> >


> >


> > So forget ballscrews and leadscrews (and linear bearings on ways).


> >


> >


> > Ultra fine dust will eventually work into the mechanisms and cause


> > problems.


> >


> >


> > The most dust tolerant drives are timing belts or roller chain


> drives,


> > though a rack can work if you mount it teeth down with the drive


> gear


> > below it so the dust is less likely to settle in the rack. If you


> > decide on belt drive, mount the belt with the teeth facing down.


> >


> >


> >


> >


> > I expect some expert CNC experts may disagree with these comments


> as


> > their setups have worked ok to date. But I speak from a lifetimes


> > experience as a professional woodworker and know that as machines


> > loosen up a bit the dust will start to work its way inside the

most

> > delicate places.


> >


> >


> >


> >


> > Regards


> >


> >


> > Bob Thomas.


> >


> >


> >


> >


> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ddgman2001"

<sheldon@d...>

> > wrote:


> >


> >


> > > What is the best drive system for a wood router considering the


> > dusty


> >


> >


> > > environment?