On 05/23/2010 09:48 PM, Gene Heskett wrote:
> Steve, thanks for the reminder. I was at some point if I didn't get
> distracted, which I do easily in my dotage, going to mention that.
>
> The area of the opening has to be less than the width of the strip of bamboo
> Mark starts with, and the maximum pressure that can be obtained corresponds
> to the normal atmospheric pressure, supposedly 14.7 psi at sea level. If
> Mark is in Denver its going to be less of course. So the hold-down pressure,
> assuming the vacuum is presented to a strip 1/8" wide, will then equal
> nominally 2 pounds per running inch or a hair less. 3/16" wide would be
> nice, but near the tip of the strip, its not even going to have that eighth
> inch. That will generally hold it I would think, till the saws get dull, at
> which point its going to spit it out. I believe I might consider adding a
> roller, maybe two, one in front of the saw blade, and one behind, with
> another 4 or 5 pounds of pressure on the bamboo from the rollers. It might
> improve the yield enough to buy the rollers in a days time.
Gene,
The good news is, the strip is a constant 3/8" wide the entire length.
The tapered strip gets cut out of that rectangular strip with the wide
part of the triangle on the top. Picture the saws in a 60 degree
included angle "V", with the apex of the triangle at the bottom, and the
flat "bottom" of the triangle at the top. The saws enter from one end,
make a single pass cut, and the triangular strip is ready to be knocked
out of the rectangular strip - there's a .005" thick web caused by the
necessary gap between the saw blades which works in it's favor while the
strip is being cut. It holds the cut part of the strip in place so it
doesn't get caught in the saws by flopping around.
Mark
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