Re: Off list Re: How Would You Design question

Would love to look at the drawing. Never hurts to get extra ideas.

Tim
[Denver, CO]

----- Original Message -----
From: "rcstickman" <alantrest@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, April 25, 2002 10:37 AM
Subject: [CAD_CAM_EDM_DRO] Re: How Would You Design question


> Hi Tim,
>
> My thoughts go to single axis postitioning of the "Saw" using stepper
> or servo control> This would be for depth or thickness of cut with
> very little movement required.
> Longitutal travel to be handled by air cylinders and solinoids (due
> to surplus availability and resonable cost. In this case the saw
> would be moved and not the board.
>
> Lateral travel into the blade path ( could be stepper or servo
> controled as well.
>
> I have a preminary drawing of this if you are intrested let me know.
>
> Alan Trest
> Pensacola Florida
>
>
> --- In CAD_CAM_EDM_DRO@y..., "dave_ace_me" <davemucha@j...> wrote:
> > On a similar note,
> >
> > I made a saw many years ago that had multiple blades. A 2x4 was
> > passed through it and it sliced and diced to make 1/4 inch wide
> > strips. They were then glued them to make curved laminated beams.
> >
> > I do not know if you have multiple parts of one size, but such a
> set-
> > up would allow you to pass a single piece, cut all your parts and
> > only need a fence.
> >
> > Kind of eleminates the whole CNC thing, but may be effective.
> >
> > Dave
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "Marcus & Eva" <implmex@a...> wrote:
> > > Hi Tim:
> > > You will probably need to stabilize the material on both
> sides
> > of the
> > > cut if you want to hold 0.0025"
> > > Best way I can think of for the free strip is a vacuum fence.
> > > If you just let it hang out in space the saw will recut it every
> > time it
> > > curls or flops around.
> > > You'll never hold tolerance without the vacuum fence.
> > > So long as you can adjust it dead nuts parallel and exactly to
> > width, you
> > > may not even need anything more elaborate than just the fence.
> > > It's worth a try anyway ( cheapest part of the whole rig,
> assuming
> > you've
> > > got a decent saw and a top quality planer blade.)
> > > If you want to get fancy, then you can set up a panel sawing
> frame
> > to run in
> > > the miter fence slots, and top clamp the stock.
> > > You still need the vacuum fence though (but it becomes part of
> the
> > sliding
> > > frame.)
> > > Cheers
> > >
> > > Marcus
> > > ----- Original Message -----
> > > From: "Tim Goldstein" <timg@k...>
> > > To: <CAD_CAM_EDM_DRO@y...>
> > > Sent: Wednesday, April 24, 2002 7:16 PM
> > > Subject: RE: [CAD_CAM_EDM_DRO] Re: How Would You Design question
> > >
> > >
> > > > Lots of considerations in this besides the ease of cutting. A
> > knife edge
> > > > band saw will cause crushing of the wood towards the surface
> and
> > drive
> > > > up the density while reducing the stiffness. There is also the
> > problem
> > > > that a band saw blade wanders and would make the thickness
> > inconsistent.
> > > > Reducing the waste is not a concern. Turning 50% of the raw
> stock
> > to
> > > > dust is OK if the resulting product is very smooth and
> > consistent, not
> > > > sawn, and has the absolute minimum fiber damage on the surface.
> > From all
> > > > the ways of cutting I have tried using a circular saw blade
> > produces the
> > > > proper product. You have to take off your engineering hats on
> > this part
> > > > and accept that marketing says it has to be cut that way. Not
> put
> > the
> > > > engineer hat back on to work on the design for this.
> > > >
> > > > I am leaning to using a timing belt to drive the feed for the
> > cutting
> > > > and a lead screw on the advance feed. I am thinking that the
> best
> > way to
> > > > avoid lash on the advance feed it to spring load it to apply
> > pressure
> > > > against the screw. This avoids the need to use zero backlash
> type
> > > > systems and should work fine as there is no load or pulling in
> > this
> > > > direction. The part I am still hung up on is how to arrange the
> > length
> > > > feed so that the + - .0025" thickness requirement can be met
> > without
> > > > building a monstrosity. Something like the 80/20 stock is
> > appealing, but
> > > > I doubt that it can be consistent down the length. I like the
> > idea that
> > > > someone threw out to have a stop that controls the cut
> thickness
> > as the
> > > > precision part than just becomes the slide against that.
> > > >
> > > > Tim
> > > > [Denver, CO]
>
>
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