Re: [CAD_CAM_EDM_DRO] Re: abrasive wood? was: Lead screws for ever...(plastic)

Hi Chris,

Balsa wood doesn't have a problem with being abrasive but, if you go to
using some harder woods you will find that ordinary steel tools blunt very
quickly. This is because several types of wood have the nasty habit of
sucking up silica and storing it in their cells. Since silica is a powerful
abrasive it soon takes the edge off tools. Worst for this are some of the
tropical hardwoods.

Ian
--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: "Chris Hellyar" <chris@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: 29 October 2000 07:58
Subject: [CAD_CAM_EDM_DRO] Re: abrasive wood? was: Lead screws for
ever...(plastic)


> Wood dust abrasive?
>
> Ummmm.
>
> I'm not going to leap in here and put my foot in mouth, I don't have a
> problem with some plastics being abrasive, but I would have thought that
> wood dust would be fairly mild compared to harder materials... Although I
> suppose normally metal swarf is too big to get into the bearings, whereas
> the dust I'll be making out of balsa is very fine. I had a play with the
> dremmel and a .8mm endmill and the dust was talc like. Talc now, there's
an
> abrasive....
>
> I might put this one in the "I'll think about it" basket for the mo...
>
> Cheers, Chris.
>
> * Design engineer, Assembly worker, Cleaner.
> * Ohmark Electronics. PO Box 5302, Christchurch, New Zealand.
> * http://www.ohmark.co.nz
>
> ----- Original Message -----
> From: Anne Ogborn <anniepoo@...>
> To: <CAD_CAM_EDM_DRO@egroups.com>
> Sent: Sunday, October 29, 2000 8:45 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Re: re:Re: Lead screws for
> ever...(plastic)
>
>
> > > > Something not often mentioned in the choice of ballscrews vs. ??? is
> > > > that ballscrews are EXTREMELY intolerant of dust/dirt/swarf/etc.!
> > >
> > > I've already got the bellows sorted out... at the end of the day this
> > > machine is going to cut balsa and plastic for models, probably not a
big
> > > deal.. I also intend to have a "chip vac" or at least a buggered old
> vacuum
> > > cleaner...
> >
> > Uh, actually, wood is viciously abrasive. Plastic only slightly less so.
> > Either is far worse as swarf than metal.
> >
> > If you're cutting these materials the chip vac is a great idea. These
> > nonconductive materials (esp. the plastics) cling by static electricity
> > to everything around them 8cP
> > They're a real mess.
> >
> > Annie
> >
>
>
>
>
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