On Monday 24 May 2010, Mark Wendt wrote: >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. > 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.
>Mark > >--------------------------------------------------------------------------- >--- > >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users > -- 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) Your mode of life will be changed for the better because of new developments. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
