Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 4 of 4
Thread: 5C Collet Square Stock Tolerance
-
28th December 2013, 08:30 PM #1Senior Member
- Join Date
- Apr 2009
- Location
- Kingswood
- Posts
- 422
5C Collet Square Stock Tolerance
I need to make four small components that will involve milling some Dia 8 brass stock down to 6 square (with rounded corners), each part about 10 long, and then chucking in the lathe to make a Dia 3 spigot about 3 long on each part.
Mill operations will add a cross hole Dia 2.5 and the last step will be filing the square end using buttons.
I am planning to use a 5C square collet for the lathe, about 7 length in the collet for the last part from the stick of four.
How accurate must the 6 x 6 square dimension be to correctly fit the collet ?
My investigations leads me to think +/- 0.1 mm might be OK.
I have never used square collets, is this a reasonable tolerance for the square work ?
The collet has not been purchased yet, but will probably be part of a set from ArcEurotrade in the UK.
Best wishes to all for 2014,
John
-
28th December 2013 08:30 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
28th December 2013, 08:53 PM #2Senior Member
- Join Date
- Sep 2008
- Location
- Riddells Creek
- Posts
- 300
I would say +0.0 to -0.1 would be Best. You might get away with up to +0.05.
-
29th December 2013, 10:47 PM #3Senior Member
- Join Date
- Apr 2009
- Location
- Kingswood
- Posts
- 422
Thanks for the response, Techo1.
Further investigations today would indicate that any '+' tolerance is not tolerated by many top-end 5C collet brands, and the '-' tolerance should be limited to about -0.05.
I will just have to make sure my milling to size comes within these requirements.
I get the impression that economy brands could be a considerable error away from nominal and that the user just needs to be aware and to compensate accordingly.
My only interest in 5C collets is to get the square fitting, I have other chucks and collets for round stock.
I will get the 5C square collets, then experiment as to what size fits.
One very surprising revelation is that forcing the collet to open a small amount by forcing with tapers and/or screwdrivers in the slots is reported in industrial practice, although it may be frowned upon by management.
John
-
31st December 2013, 07:23 PM #4
5C collets
Hi John,
For quality reasons I'm sticking with Hardinge and one of the best deals I've found is through Amazon, at least for round collets. The squares and hex are a bit more I think. The shipping can make the difference.
All the best to you as well.
Cheers
The Beryl BlokeEquipmenter.... Projects I own
Lathes - Sherline 4410 CNC
Mills - Deckel FP2LB, Hardinge TM-UM, Sherline 2000 CNC.
Similar Threads
-
CS gauge: how much tolerance?
By rsser in forum SMALL TIMBER MILLINGReplies: 24Last Post: 1st February 2012, 05:58 PM -
making square stock round on a metal lathe
By 19brendan81 in forum METALWORK FORUMReplies: 17Last Post: 19th April 2010, 09:20 PM -
House tolerance dimensions
By MICKYG in forum WOODWORK - GENERALReplies: 6Last Post: 19th October 2009, 08:09 PM -
Concealed hinge tolerance
By Stinger9 in forum WOODWORK - GENERALReplies: 4Last Post: 29th September 2009, 02:02 PM -
Centering square stock in a 4 jaw chuck
By Dingo Dog in forum METALWORK FORUMReplies: 2Last Post: 11th April 2008, 09:13 AM