Re: [CAD_CAM_EDM_DRO] Re: How Would You Design question

Hello Tim,
I didn't follow the hole tread. But I am pretty sure you will run into a
hell of a problem. 2,5 thousands! Wood is wood and is never that
uniform. Before you build any machine make tries by hand or similar
machines you think that might work.
I suspect you might get a reasonable result with a very sharp planer.
Shave of the skin you want.
Sven Peter

Tim Goldstein wrote:

>
> 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]
>
> > -----Original Message-----
> >
> >
> > Hi Tim,
> >
> > not to belabor the point, but can you slice soft wood with a knife
> > edge band saw blade ?
> >
> > I do understand that a toothed blade would tear while
> > cutting. seems like the best of both worlds.
> >
> > Also, I recently went through a similar plight. I need to cut lots
> > of aluminum parts with some curves and stuff. Laser and Water cut
> > cleanly, Plasma is rougher and has a poorer finish, but costs way
> > less. All of those are more expensive than the amount of material I
> > will use in the next year, so a greater loss of material and using a
> > router will be the most cost effective method for me, at this time.
> >
> > I plan on increaseing my total units so will move up to a high end
> > plasma before too long.
> >
> > If your waste is greather in cost than a planer, you may find a poor
> > surface and a planer may be more economical in the long run.
> > Of course the second operation adds time and money so may not be as
> > viable in your situation.
> >
> > Dave
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote:
> > > Causes too much crush and tear damage to the wood structure on the
> > > surface. More of a concern with thinner sheets than is intended for
> > this
> > > contraption but it would be one of the unique things about this
> > specific
> > > wood. So the answer is for marketing purposes it has to be sawn
> > with not
> > > additional finish steps.
> > >
> > > Tim
> > > [Denver, CO]
> > >
> > >
> > > > -----Original Message-----
> > > > Tim:
> > > >
> > > > What about sanding?
> > > >
> > > > -- Jerry
> >
> >
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> OFF Topic POSTS: General Machining
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> http://groups.yahoo.com/group/jobshophomeshop I consider this as a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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