On Wednesday 26 May 2010, Mark Wendt wrote:
>On 05/25/2010 09:21 PM, Gene Heskett wrote:
>>> 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.
>>
>> Aha! Practical engineering, love it. And its also just sufficient to
>> prevent the cut strip from being sucked deeper into the groove. Not to
>> mention maintaining the seal rather than let it bleed away at the bottom
>> of the saw kerfs. Yes, love it. A lot. This would make the inspection
>> of the bamboo's bottom for flaws pretty mandatory, but for something like
>> that, its a given.
>
>Gene,
>
>The design of the machine more or less precluded spring loaded mounted
>hold downs because they had to be fairly close to the saw blades, and
>with the cutting head moving up and down, it would have been a nightmare
>to design a hold-down that could maintain a constant pressure against
>the bamboo when the head could move up and down almost 3 inches.
The answer to that then would have been air cylinders, teeny little ones with
a bearing mounted in the clevis and of the piston rod. No idea where to
source them though.
>The
>tests I've run so far show that had I used a "thicker, foamier" gasket,
>I could probably seal the leaks completely, but the gasketing material
>works well enough so that the pump keeps up with it and I only lose an
>inch or two of vacuum with the leak(s) from the bamboo to gasket.
Thats not shabby at all!
>Plus,
>the gasket material I'm using compresses not very much bt just enough,
>so it makes it quite easy to get accurate touch offs without the bamboo
>moving, and it's easy to clean the bamboo dust off of after a cutting
>pass. This was the gasket recommended to me when I called All Star
>Adhesives and talked one of their tech guys and told him what I was
>doing. They make good schtuff, they're willing to work with small shop
>guys like me, and their prices are very reasonable. They sent me a 50
>yard roll of the gasket, 3/4" wide for around $20, and tossed in a sheet
>of another type of gasket material to try if I wanted to that's about 2'
>wide by 6' long for free. Good folks to do biz with.
>
>Mark
Sounds like, thanks for the endorsement. Now I'll know where to go get
similar stuff when I need it.
But right now, the grass needs cut, and its warming up nicely. :(
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Dentist, n.:
A Prestidigitator who, putting metal in one's mouth, pulls
coins out of one's pockets.
-- Ambrose Bierce, "The Devil's Dictionary"
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