Re: Room for everybody (still)

Chris,
A 1/4-20 rod with a 1/2" thick Piece of Delrin has
almost no backlash. The orignal post asked if threaded rod
would be good for a machine that cuts wood. Try talking to
a woodworker in thousands. Someone doing inlays now that's
different. Making a wooden panel that is off by .02 is
incredible. The threaded rod when correctly used is even
more accurate. The orignal poster was talking wood, not
steel not a printing machine, wood!

Bob

--- In CAD_CAM_EDM_DRO@y..., Chris L <datac@l...> wrote:
> Hey,
> I read this whole post too.
>
> I just know that .006 turns to .012 on direction changes. When you
try to
> cut some really nice text into a nice sign blank and you end up with
> "stepping" along all your edges in Z, you end up wishing you had
something
> more accurate.
>
> The "thrill" of CNC does not seem to last as long when you profile
around the
> outside of a signblank and now find you need to sand for an hour
just because
> the vertical edges are not straight.
>
> So, that's why I suggested spending a little more money up front on
a better
> screw and nut setup, rather than the hours you will spend either
making a
> nut, OR , sanding and filing your new sign into shape.
>
> But, There are no laws ! You can use threaded rod if you'd Like !
>
> Chris L
>
> ballendo wrote:
>
> > Bob,
> >
> > Thank you for this post. I think we're in agreement here? The post
> > you are replying to(mine) is mostly about lo-res machines for
other
> > than metal. I DID read the entire thread, and saw the opening to
> > welcome some lurkers into the light...
> >
> > Hope this helps.
> >
> > Ballendo
> >
> > --- In CAD_CAM_EDM_DRO@y..., "cncdxf" <cncdxf@a...> wrote:
> > > Ballendo,
> > > The original post was asking if threaded rod would
> > > be ok for wood working. Then all kinds of answers came. It
> > > is obvious to me only a few people read the posts. Making
> > > a wooden sign using a machine that has threaded rod would
> > > turn out the same product as a more expensive machine. The
> > > proof is in the internet. There are two large sites devoted
> > > to homemade machines. How many people have taken an anti-
backlash
> > > nut put it on standard threaded rod and measured the error. What
> > > is it? There are alot of craft people out there that are jumping
> > > into CNC. Their suff looks great even with a .006 error. Anybody
> > who
> > > is anybody in CNC started off building their own machine. John
told
> > > me he is getting swamped with orders. He has opened up the CNC
door
> > > for me and others. I was milling boards for a local company
using
> > one
> > > of John's designs. The company just had a big layoff. So much
for
> > my
> > > egg money. Go back and read the posts on threaded rod, then
read the
> > > orignal.
> > >
> > > Bob
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "ballendo" <ballendo@y...> wrote:
> > > > Bob,
> > > >
> > > > I applaud John K's minimalist approach... But,
> > > >
> > > > On this list people are "doing" cnc for many different
reasons,
> > and
> > > > with VERY different needs and expectations.
> > > >
> > > > Some will be very happy just to have a machine that moves
> > somewhat
> > > > repeatably. Period. Others are wanting/needing to work to
better
> > > > than .001 accuracies.
> > > >
> > > > And this distinction IS NOT drawn between "amateur"
> > > and "commercial"
> > > > users! It depends on the parts needed. AND the material!
> > > >
> > > > One of the things that I find a little frustrating is that the
> > > > majority of posts on this list seem to refer to CNC as used
for
> > > METAL
> > > > working. And "tight" tolerances. CNC is applicable FAR
> > > beyond "just"
> > > > metal. Where are the woodworkwers? Where are the plastic
workers?
> > > The
> > > > engravers? The pc bd makers?
> > > >
> > > > I think Chris Strattons recent post about cyclic
> > > variations "ruining"
> > > > his tubing mandrel? to be one of the more useful bits of info
> > > shared
> > > > recently. Something many wouldn't otherwise "think of"...
> > > >
> > > > We have seen the list recently become "re-aimed" at the home
shop
> > > > user. Okay. I hope that we will ALSO see some of those who
work
> > in
> > > > that "home shop" with OTHER than metal, at all levels of
accuracy
> > > > needs, feeling free to speak up...
> > > >
> > > > Hope this helps.
> > > >
> > > > Ballendo
> > > >
> > > > P.S. What I'm saying is that there may be many who just don't
> > speak
> > > > up because they may feel that their 100 step/inch machine will
> > > > not "measure up"... Or that a question about depositing
glazes on
> > > > tiles to be fired (with cnc) will find no answers...
> > > >
> > > >
> > > > --- In CAD_CAM_EDM_DRO@y..., "cncdxf" <cncdxf@a...> wrote:
> > > > > Hi Ballendo,
> > > > > I suspect the people who had trouble with
threaded
> > > > > rod used a regular nut also. Tapping a piece of 1/2" Delrin
to
> > > > > run on the nut works great. I also suspect they used coarse
> > > > > threaded rod. John K got me to use <snip>
> >
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