On Sunday 23 May 2010, Steve Blackmore wrote:
>On Sun, 23 May 2010 07:11:46 -0400, you wrote:
>>The pump I ended up buying claims it pulls 5 CFM . I sucks the
>>reservoirs dry pretty durned fast. I made up one of these systems:
>>
>><http://www.joewoodworker.com/veneering/EVS/concept.htm>. Seems to
>>be pretty efficient.
>>
>>I've got a similar issue on my hold down bed. I ran a bead of silly
>>cone around the joint yesterday afternoon before I called knock it
>>off. Hopefully, the goop found the leak and sealed it off.
>
>Hi Mark - not too pee on your bonfire, but, pretty much any sort of
>pump can suck the air out of a bag. Holding something in place is always
>more difficult. Place stoppers against your parts to stop sliding.
>
>Steve Blackmore
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.
--
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)
Pedaeration, n.:
The perfect body heat achieved by having one leg under the
sheet and one hanging off the edge of the bed.
-- Rich Hall, "Sniglets"
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