> > Group, I plan to mount my plasma cutter in a fixture in such a  way
 > > that I can feed 4130 tubing under it to cut saddles. The tubing
 > > would rest on a receiver which would allow me to move it in  and out
 > > and also rotate it. I don't plan to follow templates, just silver
 > > pencil marks the same as I do now when grinding the saddles. The
 > > advantage would be that the cut would be perpendicular to the  wall
 > > (grinding and all rotating tools make feathered edges), it  would be
 > > very fast and much cleaner than grinding. Does anybody see any
 > > reason why this would not work? Jerry
 > >
 > > Sounds like a great idea Jerry. You could make paper templates
 > > using 3D and
 > > transfer the curves to the tubing with silver pencil.
 > > --
 > > Paul Lamar ...No rotor no motor.
 >
 > Paul, considering a complete engine mount with numerous clusters,
 > how difficult would it be for you to provide me with such  templates.
 > It sounds like a major undertaking. The problem is I seldom (so far
 > "never") build the same mount twice. Would the files be graphics
 > or CAD? Could you send me one as a test. Thanks Jerry
 >
 > It would be a lot of work. I am not volunteering :)
 > Now if you want to buy Rhino and a PC I can send you the mm files
 > and you can do the templates. The scale templates can be printed  from
 > jpg files using the screen capture trick or printed directly
 > from Rhino. It takes about two or three minutes for each template.
 > A six tube motor mount would have 12 templates. It is kind of
repetitive and
 > tedious work.
 > --
 > Paul Lamar ...No rotor no motor.

Might the plasma cutter cut all  the way thru the tubing?
There are numerous tubing notchers...try Aircraft Spruce, Mittler  Bros,
Low Buck Tools - ask any fab shop.
Yogi

Hi Yogi,  all the tubing notchers that revolve (grinders, mills, hole
saws)  are a waste of time. I have tried all of them.  The best was a
milling table set up on the lathe very accurate, but slow to set up.
Mainly I am trying to get away from feathered edges which often will
burn back in welding.   A commercial tubing nibbler which would do
the job would run nearly $3000.00.  I am trying to do the same with
what I have on hand.   Jerry


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