Re: Thread milling

Every split collet has a gripping range regardless of type or
manufacturer!
Thats why they are split.
Some have a very narrow range of only a few tousands others for
example ER collets are specificly ranged to hold every diameter.
To be safe check the manufaturers enginering specs.


--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> I'm not confusing anything with anything. The original poster

indicated that "standard" collets have a range of acceptability in
regards to diameter. This is simply not true. No gray area. Its one
of the very basic fundamental rules regarding "standard" one piece
collets. R-8 or 5C. Its a big no-no. Any machinist knows this. Its
part of the first day in the shop orientation for new recruits. Not
my rule just the industry practice. Taps don't belong in a spindle.
Thats why they dont fit. They belong in tap handles and tapping
heads...where they were designed to be used.

> Ron
>
> Jon Anderson <janders@n...> wrote:
>
> R Rogers wrote:
>
> > I was taught and its common knowledge within the ranks that there

is

> > no such thing as a size range on collets.
>
> Ron,
>
> You are confusing lathe collets with milling chuck collets, which -

are-

> designed to handle variations within a small range. Though used for

end

> mills, they are also how virtually all machining centers chuck

drills.

> DA and ER collets are the most common.
>
> Jon
>
>
>
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