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]

> -----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
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
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> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>

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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