ABS is easier to cut the spacer but you still need a way of doing it.
It could be done on a jig saw with a removable blade. You drill
a hole in the spacer material. Put the blade through it and proceed
to cut the straight lines.
Hang on to the air pump Doug. Makes a great and long lasting vacuum
pump to power your gyros. A bit heavy but well worth it.
BTW Tom this 3D shows the rectangular flanges.
Ignore the slots in the plates people as Tom idea was to go to
a thicker spacer and attach the slide throttle push pull
rod to the Teflon another way.
Paul Lamar
Yeah, I understood from your explanation.  I didn't include the holes in the middle
of the inside plate for the flange attachment.  I'll add those to the program.  T.W.
On the ABS solution.  We may be able to use a router and template to cut the spacer.
If the ABS is appropreate for this use.  Match drill the spacer to the front and back
plates.  I can cut the 3/16" 6061 T6 plates and the flange. Maybe thats all we need
to cut... T.W.
No need to do add the holes to the program. That way one program for both
plates.  The outer plates does not have the holes as tubes should
be welded on. People can match drill those side flang holes. The side
flange holes in the  back plate  also need to be countersunk from the
inside so the Teflon can slide by the flat head screws.
Paul Lamar

Why not use Teflon for the spacer? You already have for the slide.
Just cut the slide out of the center of it.
If the kerf size is small enough.......
Blake

-- 
Blake C. Lewis
RV8                                     N698RV reserved
Finishing the empennage and have the wing kit


That's a pretty good idea Blake. I think we could cut it
with a thin (.020) slitting saw in a mill or drill press.
Mount the Teflon on a right angle plate and use an
XY table to move it past the saw. The corners could
be finish cut with an exacto knife. Or four holes
drilled in the four corners. One problem is Teflon comes in
12" by 12" sheets so the spacer is 4.5 inches high
while the slide is 3.5 inches high. Normally we get
3 slides out of one sheet.

BTW Does hot wire work on Teflon? Chlorine gas is no
fun however.

BTW I called the PCI parallel port guys Wed and they said they
would ship Yesterday. We shall see.

Paul Lamar

The slider may have performance advantages over the conventional
throttle body,  then again maybe not. Remains to be proven.  However, a
conventional butterfly throttle body cut out of solid aluminum  is one
hell of a lot easier to build.  It is a simple lathe operation except
for a few holes drilled in the mill. No need for computer programs at
all.  Just lay it out and let the chips fly Even an extremely
amateurish machinist such as myself can make one in less than a day.
In fact no one can make a slider on his own in his own shop.  Lasers,
NC mills, a bunch of different plastics without proven track
records.......I think buying one chunk of 2.5" x 6" aluminum rod is a
better way to go, unless of course the slider is worth 20 hp.
Jerry

I don't think so Jerry. We will go with all aluminum except
for the Teflon slide. I'll have the spacer water jet cut
when I get back from OSH.

What about the slotted shaft, shaft bearings, seals, tiny screws holding
the plate to the slotted shaft that could fall out and go into the engine  with disastrous results? Not to mention lever arms, links and ball joints? It
is not as easy as it looks.

Paul Lamar

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