RE: [CAD_CAM_EDM_DRO] Speaking of VFDs

> -----Original Message-----
> Tim, very nifty stuff. But is this perhaps better done on a table
> saw? Or maybe a modified deli slicer? Or a band saw with an
> extremely tight, wide blade. I would think you will get the best
> results with a spindle that is supported on both sides of the saw.

Been there and tried most of it. Problem with a table saw is you have no
automatic feed and no way to advance the wood to get a sheet the thickness
you want. You cut the wood with the sheet coming off the free side of the
blade. If you run the wood so it is between a blade and the fence you end up
damaging the surface as it is drawn back to the blade on the way out. With
the wood on the free side you actually lift the wood off the blade as it is
cutting so as to not allow it to rub on the blade. Part of what I did not
mention is that the sheets of wood are about 1-1/2" wide, 12 or 18" long and
thickness runs from .006" to about .040" depending upon the use. Surface
finish on the wood has to be almost like it was polished with even the
slightest nick being unacceptable (take a .008" piece and put a .002" knick
in it and you have a very week spot). To further complicate matters balsa
this light will very rapidly increase in density if the blade is cutting
like a knife (counts out slicers) or vibrates against the surface (counts
out band saws). A block of 4 lbs/cu ft balsa is a rare item. In a full
tractor trailer load there may be 5 board feet so you go to great lengths to
keep it at 4 lb/cu ft density. Just cutting it on a slotting blade that has
more than say .010" run out will cause the density to rise by 25% from the
wood surface being compressed.

To give you an idea the plane you see in the opening picture is 22" wing
span and weighs 1.2 gm. It's best flight time is 27 minutes (yup, wind the
rubber motor once and it flies in a circle for almost 1/2 hour) in a 180'
ceiling (Flew in what was the Goodyear Airdock dirigible hanger in Akron, OH
over the Labor day weekend). World record for the current rules is 34:59 in
the same venue.

To bring this back to the topics we cover, my whole reason in buying an 18"
surface grinder was to be able to grind indoor balsa sheets that are thicker
than what I want at the time. Gave me another project to CNC. Anyone ever
convert a hydraulic feed surface grinder to a lead screw?

Tim
[Denver CO]

> You might be able to get upgrade bearings for the bport (ceramic
> balls/races) which could handle high speed running.
>
> Chris Stratton
>
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