I have a set of 5C collets that are from 1/16" to 1-1/16" at every
1/32nd. I'm considering getting the "in between" sizes, effectively
giving me all collets at 1/64th Increments.

Now I really don't have a specific *need* for them, but since they are
made... I was curious as to what the need for having a "high
resolution" set(for lack of a better term)..

Does anyone here actually benefit from having all of them? I'd be
interesting in knowing what kind of precision work requires them.

Thanks a lot.

Darren Harris
Staten Island, New York.

On 6 Apr 2006 17:14:55 -0700, wrote:

I have a set of 5C collets that are from 1/16" to 1-1/16" at every
1/32nd. I'm considering getting the "in between" sizes, effectively
giving me all collets at 1/64th Increments.

Now I really don't have a specific *need* for them, but since they are
made... I was curious as to what the need for having a "high
resolution" set(for lack of a better term)..

Does anyone here actually benefit from having all of them? I'd be
interesting in knowing what kind of precision work requires them.

Thanks a lot.

Darren Harris
Staten Island, New York.

Get a few "emergency" collets of brass or soft steel and bore them to
suit if you need a special size.
--
Randy Replogle

--Gads, if you can afford these, you can afford to shoot me a check
for ten grand or so, heh. My advice: don't bother buying one until you need
it. Get a couple of machinable blank 5-Cs if you must, but that's it.

--
"Steamboat Ed" Haas : Concave, convex, con
Hacking the Trailing Edge! : carne: all is Zen..
www.nmpproducts.com
---Decks a-wash in a sea of words---

I find that collets provide a good quality control device for me.
Frequently I will machine a section of a shaft and then part off and
flip the part around and machine the other end. This requires that I
hold the machined part in the collet that matches its machined
diameter. these are typically standard sized collets, but gripping on
a machined rather than stock diameter. If the correct sized collet (ie
the size of the spec'd shaft) does not hold the work precisely, the
piece is not to tolerance and typically is scrapped. These are
relatively simple parts but with many people of different skill levels
performing the machining, if the collets don't hold I assume the part
is worthless.

Woodworker88
Student Machinist
Los Altos High School "Eagle Strike" Robotics Team
www.lahsrobotics.org

I find that collets provide a good quality control device for me.
Frequently I will machine a section of a shaft and then part off and
flip the part around and machine the other end. This requires that I
hold the machined part in the collet that matches its machined
diameter. these are typically standard sized collets, but gripping on
a machined rather than stock diameter. If the correct sized collet (ie
the size of the spec'd shaft) does not hold the work precisely, the
piece is not to tolerance and typically is scrapped. These are
relatively simple parts but with many people of different skill levels
performing the machining, if the collets don't hold I assume the part
is worthless.

Woodworker88
Student Machinist
Los Altos High School "Eagle Strike" Robotics Team
www.lahsrobotics.org

wrote:
I have a set of 5C collets that are from 1/16" to 1-1/16" at every
1/32nd. I'm considering getting the "in between" sizes, effectively
giving me all collets at 1/64th Increments.

Now I really don't have a specific *need* for them, but since they are
made... I was curious as to what the need for having a "high
resolution" set(for lack of a better term)..

Does anyone here actually benefit from having all of them? I'd be
interesting in knowing what kind of precision work requires them.

My 5C collets are every 16th, have never needed an in-betweener. Yet.

Recommend you don't buy them just to buy them.

Lately I've been using my 5C indexer quite a bit. If you want to spend money on
workholding, I suggest you get some really good quality 5C workholding stuff. I
have (and use, and like) the 5C square and hex bars, a 5C solid
horizontal/vertical mount (like an angle plate that holds a 5C collet), and a 5C
indexer. I use 'em all. If you had a 5C nosepiece for your lathe that might be a
different story. I have every 3C collet (except the 1/64", don't really envision
turning a workpiece that small; if I do I can grab it in a pin chuck and rechuck
that) for my 9" South Bend.

The thing about workholding with collets is you have to grab the part tightly,
and if the workholder isn't made well, you may have real trouble getting it
tight enough.

GWE

Does anyone here actually benefit from having all of them? I'd be
interesting in knowing what kind of precision work requires them.

Just to give the other opinion, I wouldn't be without a full set by /64s.
Then you can grip anything, they will collapse that much. I hate not having
the tool I need when the job comes up. (If you don't get work you got to do
NOW, things might be different) Of course, I waited and bought at Ebay
pricing.

Karl

I find that collets provide a good quality control device for me.
Frequently I will machine a section of a shaft and then part off and
flip the part around and machine the other end. This requires that I
hold the machined part in the collet that matches its machined
diameter. these are typically standard sized collets, but gripping on
a machined rather than stock diameter. If the correct sized collet (ie
the size of the spec'd shaft) does not hold the work precisely, the
piece is not to tolerance and typically is scrapped. These are
relatively simple parts but with many people of different skill levels
performing the machining, if the collets don't hold I assume the part
is worthless.

Woodworker88
Student Machinist
Los Altos High School "Eagle Strike" Robotics Team
www.lahsrobotics.org

wrote:

I have a set of 5C collets that are from 1/16" to 1-1/16" at every
1/32nd. I'm considering getting the "in between" sizes, effectively
giving me all collets at 1/64th Increments.

Now I really don't have a specific *need* for them, but since they
are made... I was curious as to what the need for having a "high
resolution" set(for lack of a better term)..

Does anyone here actually benefit from having all of them? I'd be
interesting in knowing what kind of precision work requires them.

Thanks a lot.

Darren Harris Staten Island, New York.

When I used to run a lathe in production work, both manual and CNC,
the companies I worked for used a range of 5C collets with .005"
increments, although we could go to +.010" w/o getting in trouble with
the foreman. More than that and the collet would spring and no longer
close and grip consistently. We didn't have every size .005" increment
up to an inch, just the most common ones, but if we needed an uncommon
one, we'd buy or bore the correct size.

David

wrote:

Does anyone know the acceptable tolerance for boring a hole in an
"emergency collet", and if this changes as the size of the collet/work
change?

Thanks.

Darren Harris
Staten Island, New York.

It's an emergency collet. Try not to analyse it too thoroughly, it'll
get in the way of getting anything done.

They get bored usually on the machine that they will be used on. The
accuracy will be as good as the maker can get, or as good as is needed
for the job, more to the point, then it'll be chucked in the drawer
(hopefully somewhere near the pins for it) and done over for the next
job that comes along, provided that job is the same size or larger.
That's all, really.

You are not going to find a bible somewhere that says in flaming
letters "THOU SHALT NOT BORE A COLLET LARGER THAN .0005 OVER DESIGNATED
DIMENSION"

Cheers
Trevor Jones

I have bored many emergency collets and try to bore them about .001 under
the size of stock that I am working on.. And I do the same when I am boring
soft
chuck jaws. That lets the jaws have 6 point contact with the OD of what I am
holding. If you bore the jaws oversize you only have 3 point contact and the
don't run as true. When I needed hardend ground collets I bought the 5c
collets from Hardinge as they sell them in .001 sizes.
Jim

wrote in message
oups.com...
No one has mentioned what the acceptable tolerance is for collet and

On Sat, 8 Apr 2006 19:18:35 -0700, " Jim Sehr" wrote:

I have bored many emergency collets and try to bore them about .001 under
the size of stock that I am working on.. And I do the same when I am boring
soft
chuck jaws. That lets the jaws have 6 point contact with the OD of what I am
holding. If you bore the jaws oversize you only have 3 point contact and the
don't run as true. When I needed hardend ground collets I bought the 5c
collets from Hardinge as they sell them in .001 sizes.
Jim


A full set would be something to behold G


Mark Rand
RTFM

Mark Rand wrote:

A full set would be something to behold G

Mark Rand
RTFM

I just don't want to be anywhere near the bill for that set. Hardinge
is pretty proud of their work, as good as it is.

Cheers
Trevor Jones

On Sun, 09 Apr 2006 16:23:24 +0100, Mark Rand
wrote:

On Sat, 8 Apr 2006 19:18:35 -0700, " Jim Sehr" wrote:

I have bored many emergency collets and try to bore them about .001 under
the size of stock that I am working on.. And I do the same when I am boring
soft
chuck jaws. That lets the jaws have 6 point contact with the OD of what I am
holding. If you bore the jaws oversize you only have 3 point contact and the
don't run as true. When I needed hardend ground collets I bought the 5c
collets from Hardinge as they sell them in .001 sizes.
Jim


A full set would be something to behold G


Mark Rand
RTFM


They are..a frigging wall full of collets. Ive only seen a couple
shops with them. One of them had the full set in metric too..it was in
a different room.

And they had all the various hex/oval/square etc etc..which was a much
smaller wall full

Gunner

"I think this is because of your belief in biological Marxism.
As a genetic communist you feel that noticing behavioural
patterns relating to race would cause a conflict with your belief
in biological Marxism." Big Pete, famous Usenet Racist

Gunner wrote:
On Sun, 09 Apr 2006 16:23:24 +0100, Mark Rand
wrote:

On Sat, 8 Apr 2006 19:18:35 -0700, " Jim Sehr" wrote:

I have bored many emergency collets and try to bore them about .001 under
the size of stock that I am working on.. And I do the same when I am boring
soft
chuck jaws. That lets the jaws have 6 point contact with the OD of what I am
holding. If you bore the jaws oversize you only have 3 point contact and the
don't run as true. When I needed hardend ground collets I bought the 5c
collets from Hardinge as they sell them in .001 sizes.
Jim


A full set would be something to behold G


Mark Rand
RTFM


They are..a frigging wall full of collets. Ive only seen a couple
shops with them. One of them had the full set in metric too..it was in
a different room.

And they had all the various hex/oval/square etc etc..which was a much
smaller wall full

Gunner


I guess that store bought rods are standard enough not to have to worry
about having every single size collety imaginable.

So As long as a 1" rod will fit a collet for a 1 inch rod then there
shouldn't be a problem.

I am however confused about the 5C collet dimensions. Those numbers I
mentioned for the collets I have(Outside thread 1.245 x 20 R.H., and
the inside thread 1.047 x 24 R.H) were stated by the seller. I was
about to pick up some more from a different seller when I noticed that
Machinery's Handbook gives me a different number, and a Google search
complicates things even further.

I thought that the threads(Internal and external) were standardized for
all 5C collets. Was I wrong?

Thanks.

Darren Harris
Staten Island, New York.

On 11 Apr 2006 20:04:05 -0700, wrote:


Gunner wrote:
On Sun, 09 Apr 2006 16:23:24 +0100, Mark Rand
wrote:

On Sat, 8 Apr 2006 19:18:35 -0700, " Jim Sehr" wrote:

I have bored many emergency collets and try to bore them about .001 under
the size of stock that I am working on.. And I do the same when I am boring
soft
chuck jaws. That lets the jaws have 6 point contact with the OD of what I am
holding. If you bore the jaws oversize you only have 3 point contact and the
don't run as true. When I needed hardend ground collets I bought the 5c
collets from Hardinge as they sell them in .001 sizes.
Jim


A full set would be something to behold G


Mark Rand
RTFM


They are..a frigging wall full of collets. Ive only seen a couple
shops with them. One of them had the full set in metric too..it was in
a different room.

And they had all the various hex/oval/square etc etc..which was a much
smaller wall full

Gunner


I guess that store bought rods are standard enough not to have to worry
about having every single size collety imaginable.

So As long as a 1" rod will fit a collet for a 1 inch rod then there
shouldn't be a problem.


They were in prototype/engineering shops. Price was of no concern.
Buy what you need.

And they did...lol

I am however confused about the 5C collet dimensions. Those numbers I
mentioned for the collets I have(Outside thread 1.245 x 20 R.H., and
the inside thread 1.047 x 24 R.H) were stated by the seller. I was
about to pick up some more from a different seller when I noticed that
Machinery's Handbook gives me a different number, and a Google search
complicates things even further.

I thought that the threads(Internal and external) were standardized for
all 5C collets. Was I wrong?

Thanks.

Darren Harris
Staten Island, New York.

No..true 5c is pretty much standard.

That 1.245 sounds a bit big to me.......


http://www.dunhamtool.com/5c_collet.html#specs

http://www.loganact.com/tips/collet.htm




"I think this is because of your belief in biological Marxism.
As a genetic communist you feel that noticing behavioural
patterns relating to race would cause a conflict with your belief
in biological Marxism." Big Pete, famous Usenet Racist

wrote:

I guess that store bought rods are standard enough not to have to worry
about having every single size collety imaginable.

So As long as a 1" rod will fit a collet for a 1 inch rod then there
shouldn't be a problem.

I am however confused about the 5C collet dimensions. Those numbers I
mentioned for the collets I have(Outside thread 1.245 x 20 R.H., and
the inside thread 1.047 x 24 R.H) were stated by the seller. I was
about to pick up some more from a different seller when I noticed that
Machinery's Handbook gives me a different number, and a Google search
complicates things even further.

I thought that the threads(Internal and external) were standardized for
all 5C collets. Was I wrong?

Thanks.

Darren Harris
Staten Island, New York.

They are standardized.

If you try to measure the internal threads with calipers, an internal
micrometer, expanding gauges or anything like that, you'll get about
1.047". But that isn't the thread size, is it? Hint: threads are
measured by OD.

John Martin