On Sat, 12 Jul 2008 01:53:50 -0400, Cliff <Clhuprich@[EMAIL PROTECTED]
> wrote:
>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.
Is that like a woodchuck? We have some you could have if you pay for
trapping, ****ping & CA im****tation.
PLUS it more of your typical idiocy.
The fixed jaw is FIXED.
The other jaw needs to be well-held for machining or chatter
will get you. FIRMLY clamping a 123 block or a good scrap of CRS
will do this. "approximately the same pressure as I will use to hold the
chuck of plastic" will not.
In addition, HAD YOU EVER ACTUALLY DONE THIS you would
have noticed the thin plastic stock pulling out of the vise if drilling
thru it (as drill grabs the exit "burr") and bending down into the gap
in the vise for most other machining operations.
>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.
And you have no idea where the edge is located in that "V".
>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
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