Some time ago there was some discussion on producing slide
throttle
parts or complete units, I don't remember which, maybe both. Is
that
going forward?
If not, there is a machine shop owner who is also a member of our
EAA
chapter who might be persuaded to make the parts. He has a NC mill
and
lathe. Looking at the parts, could they be more economically
produced by
a NC punch press? Would punch press made parts be acceptable? I
asked
him about transferring the design info to his NC machines. He said
he
could use a dfx file. IGES would also be acceptable, but he
prefers
dfx.
Since Rhino could produce both, it looks like a match to me.
I don't want to step on anybodies toes, and at the same time I
don't
want this effort to just languish. I have hopes that the slide
throttle
would be more acceptable to builders if they could buy parts, or
the
whole assembly. So, I might be willing to up-front the materials
cost
and initial production run if it doesn't prove too expensive.
Provided
nobody else wants to do it.
Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage
Feel free Doc. Do us all a favor and put it into production.
Yes our first ones were NC punch press. Front and back plates
were 3/16th 6061T6 about the limits of the punch press.
Very cheap to make. On the order of $15 each.
Here are some pictures.
3/16th thick square flanges could also be punch pressed.
The 3/8th inch thick Teflon slide needs to be milled, laser cut
or water jet. Whatever works best with Teflon.
The 3/8th thick aluminum spacer between the plates also needs
to be milled or water jet cut. Too thick for the punch.
Paul Lamar ...No rotor no motor.
I will talk to him. It would be helpful to have the Rhino drawings
for
him to look at and to produce a fixed file from.
I can make prints of the version 12 pix you sent to start things
off
with, but I know he is going to want the dfx file.
Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage
No problem Doc. I can give him Solid Works files which
usually work better when doing NC stuff. Or Iges or dxf
his choice.
We now have two styles. Long travel 3 inches or short
travel two inches. The long travel is an inch longer.
Paul Lamar ...No rotor no motor.
Do you have NC files for the egg shaped hole version? What are the
advantages and disadvantages of the 2" vs. the 3"?
Lets try them all. Let him choose. How do we get them to Westclife?
Earlier I sent a request for expressions of interest. When
responding
please indicate either the 2" or 3" or don't care.
Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage
I can generate files for any of them.
There is no real drawback to the 3 inch travel version other
than the length is an inch longer on the (car) rear housing
end for a tractor version and the Teflon holes are a bit more
expensive to cut by hand. No problem for an NC mill of course
and no different or more expensive than a round hole on an
NC mill.
I can send you a CD with the Rhino files and you can load
them in Rhino and export any of a whole long list of file
formats. There is still one unknown and that is the dimensions
of the throttle cable anchor used. The anchor for the cable is
now part of the front and back plate.
Suggested AC Spruce part numbers are:
A-770 button lock
A-1860 T handle button lock
A-750 Vernier
A-800 Friction lock
All have 3 3/8" travel with a 10-32 threaded end.
I need a dwg on the 10-32 threaded end from AC Spruce
and what clamps, if any, they have available to anchor
that end of the cable. Here is how Mark has set his
up. He uses a cable with a threaded end and two nuts.
The sheet metal bracket shown will not be required
as Rev 12 incorporates that into the front and back plates.
Mark, what cable part number did you use?
Paul Lamar ...No rotor no motor.
A CD is OK. And I could ftp download if the files weren't too large.
I will try modeling the throttle cable attachment. Probably a good
learning exercise. I finished level 1 and am about 25% of the way thru
Level 2.
I am getting excited about this!
Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage
I'll send a CD doc with a bunch of stuff.
Paul Lamar
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