Re: endmills pulling out of collets



Cliff wrote:

On Fri, 09 Jun 2006 03:41:37 GMT, BottleBob <bottlbob@xxxxxxxxxxxxx> wrote:


Be that as it may, they weren't *MY* numbers like you claimed
they were. You weren't being factual or honest when saying you were
just using my numbers, you were simply using numbers that you thought
would emphasize your point.

See my prior posts. Use Google as needed. I was quite clear.

Cliff:

Yes, you were clear. You said you were using *MY* numbers, when in
actuality you were not.


Possibilities and the speculation about them could be endless. Your
premise seemed to be that set-screw toolholder had so much runout that
it made them inherently poor choices for machining.

I pointed out a problem of which you seemed oblivious.
Now solve it <G>.

I try to minimize any pullout problems by using the correct tool for
the job. For instance, I've been machining a mold for the core of a
large battery case mold. I was using a 1" dia. 4" long inserted end
mill for roughing, I put it in a set screw holder since the likelyhood
of it pulling out of a collet was significantly greater than zero. Also
I set up a job that we've been running on nights that uses a 3/4"
inserted end mill to rough some 17-4 ph stainless blocks, it's also in a
set screw holder, whereas the rest of the tools for the job are in
collets. You just have to have some common sense in what you can get
away with.


I believe
Alphonso's measurements showed that premise to not be universal.

Just in your shop, right?
(I suspect he's now checked a few himself ... <g>.)

Your runout premise was shown to not be universal.


IOW you CAN'T guarantee "uniformity" of abrasive when inserting an end
mill that may scrape more grits off one side or the other. I personally
think your abrasive in the collet idea was one of the poorest ones
you've ever come up with.

Next time you have a problem ....
Wipe it on & wipe it off. Should leave a very thin
film or bits in the materials to increase the effective sliding
friction.
Or trust it to be forced out, if any excess <g>.

Well, you can abuse your own collets to your little hearts content if
you wish, *I* won't be ruining ours by turning them into laps any time
soon.

You'll just let them slip & slide?

You're assuming facts not in evidence. With the correct speeds/feeds
and doc, small tools seldom develop the extreme forces necessary for
them to pull out of our collets.

I don't see any 1", or even 3/4" cutters in your listing. HSS? I
don't think we've bought a HSS end mill in years.

And that might matter how?


If I were to try a 1 flute router bit, it would have to be 3/4" or 1"
and be carbide.

--
BottleBob
http://home.earthlink.net/~bottlbob
.

Relevant Pages

  • Re: endmills pulling out of collets
    ... And this has what to do with the runout issues? ... mill for roughing, I put it in a set screw holder since the likelyhood ... you can abuse your own collets to your little hearts content if ...
    (alt.machines.cnc)
  • Re: Tool Terms
    ... mills I'll need and how best to "chuck" them.(I'll have to also search ... an end mill holder in the spindle instead. ... Now I know there are no 5 sided 5C collets. ... In the same way, the square ...
    (rec.crafts.metalworking)
  • Re: New to vertical milling
    ... Nick Müller wrote: ... I have ruined quite some pieces when the rough-cutting mill was pulled ... They more and more use shrink collets or hydro collets. ... I also agree that industry is in the process of moving on with regard ...
    (uk.rec.models.engineering)
  • Re: Precision vs. "Regular" collets
    ... Other than you could change end mills in the collets. ... you mean end mill *holders*?) ... I see no advantage to using end mills in MT3 holders in my lathe ... the spindle anyway. ...
    (rec.crafts.metalworking)
  • Re: Tool Terms
    ... mills I'll need and how best to "chuck" them.(I'll have to also search ... use smaller collets in your spindle -- or get a Bison collet chuck head ... an end mill holder in the spindle instead. ... In the same way, the square ...
    (rec.crafts.metalworking)