Re: Machining Tips!

On Fri, 11 Jul 2008 17:19:59 -0700 (PDT), jon_banquer
<jon_banquer@[EMAIL PROTECTED]
>
wrote:

>First Machining Tip Added To The Jon Banquer Blog.

[
Tip 1:

I frequently machine plastic parts and don’t wish to waste time machining
two
sides parallel so I can hold the material so the part won’t move while
it’s
being cut. 
]

  Gee .... where's the locating datum?
  Cutting that off too?

[
Also, I usually don’t have much material to waste / hold on. To accomplish
this
task I put a set of aluminum soft jaws in a vise and tighten the jaws
against a
small parallel with approximately the same pressure as I will use to hold
the
chuck of plastic. I then mill a .030 deep step with a 1/2? 3 flute carbide
end
mill on both jaws. Next I insert a dovetail cutter and mill a dovetail in
both
the fixed and moveable jaw. I then come back and cut off the burr that the
dovetail cutter leaves making sure to push the burr away from the edge of
the
dovetail. Finally I use the end mill to create “teeth” in the dovetail so
that
the plastic part can’t slide. The whole process can be done in less than
ten
minutes and results in a cheap way to hold and mill plastic parts. It’s so
fast
I don’t even bother to save the aluminum soft jaws and instead just make
them
whenever I need them.
]

  Can anybody suggest a better way to waste time, material, jaws, &
etc. while still making scrap (claimed) parts in an unsafe manner?

  <Sheesh ..> "1/2? 3 flute carbide" .... LOL ... as if anything else
could 
not cut a little bit of soft Alumiinum .....  even when used by an idiot 
doing (or claiming to) something stupid to begin with ...

  I think he made this up today based on a post in AMC by
a real machinist ... and got it all wrong again, as usual.

  A total hoot !!!
  (Don't let this guy touch a power tool!!)
-- 
Cliff