Rivett New Style Collets

Rivett New Style Collets

Bulletin 100-B of Rivett Lathe and Grinder Inc., Draw-In Collets and Chucks, contains much useful

information. This link to it at: http://www.neme-s.org/Shaper%20Books/Rivett_Lathes/Section_4

/Rivett%20Disk%204/Rivett%20Collets%20B100-B%20%5BPDF%5D

/4_Rivett_Collets_B100-B.pdf might work. If it doesn't, see ../ General References Concerning

Collets -> Rivett Bulletin 100-B for information on how to find it online.

Bulletin 100-B clearly identifies the meaning of "NS" as "New Style" and the origin of the collet with

Rivett. Thus a Rivett collet marked "5 N.S. RIVETT" is identified as "Rivett No. 5 New Style". ("OS"

is pretty clearly then "Old Style," though I suspect that OS collets were not so identified before the

introduction of NS collets.)

Bulletin 100-B gives dimensions for Rivett Nos. 3, 4, 5, and 6 NS collets (but not the taper angle).

Tom Hammond, in a posting to the "Rivett-608" Yahoo! newsgroup on 2011-06-30, additionally gives

the taper angle for NS collets and the data on the 2NS / "Ideal" collet. Many thanks to him for this

information, especially the angle information (which was impossible to find otherwise).

Rivett New Style collet dimensions:

Style of Collet A B C D Half-AngleMax.

round

Max.

square

Max.

hex

Rivett No. 2 N.S. /

"Ideal"0.325 0.322 40

1

17/3215 1/4 ? ?

Rivett No. 3 N.S. 0.6875 0.650 20 2 7/8 15 1/2 11/32 7/16

Rivett No. 4 N.S. 0.826 0.812 20 3 1/2 15 5/8 7/16 17/32

Rivett No. 5 N.S. 1.062 1.050 20 4 7/32 15 7/8 5/8 3/4

Rivett No. 6 N.S. 1.3125 1.250 14 4 7/32 15 1 23/32 7/8

"A" is the diameter of the cylindrical portion of the collet, in inches.

"B" is the diameter of the threaded portion of the collet, in inches.

"C" is the number of threads per inch.

"D" is the length of the collet from the threaded end to the point of maximum diameter of the

taper (thus exclusive of any "domed" portion beyond the taper).

"Half-Angle" is the angle of the taper relative to the centerline, in degrees.

Rivett New Style Collets http://www.circuitousroot.com/artifice/machine-shop/collets/rivett-ns/ind...

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The "max" dimensions are the maximum hole sizes possible in the collet, for round, square, and

hexagonal holes.

These sources do not give the length of the threaded portion, the dimensions of the keyway, the length

of the slits, or the amount of doming at the working end of the collet. These are, of course, less critical

dimensions. [TO DO: measure some]

Note that some sources online claim that the Rivett New Style collets are the same size as

equivalently numbered Rivett Old Style collets except for the thread diameter. An examination of the

table in Bulletin 100-B shows this to be untrue. The diameter A of the Rivett No. 4 N.S. collet, for

example, is 0.826 while the diameter A of the Rivett No. 4 O.S. collet is 0.750.

A modern Hardinge brochure, Spindle Tooling for Manual and CNC Lathes , generally agrees with

the data in Bulletin 100-B for 4NS collets (Hardinge part number 1625), but gives a slightly different

value for "B", the diameter of the threads: 0.800. Presumably Hardinge has relaxed the thread fit

slightly.

This table in Bulletin 100-B also gives sizes for several other collet ranges, including Hendy, Cataract,

LeBlond, Seneca, South Bend, and Becker. Note that the Cataract No. 5 is the now ubiquitous "5C"

collet. Its dimensions are given here as:

Style of Collet A B C D H Max. round Max. square Max. hex

Cataract No. 5 1.250 1.245 20 3 9/32 3 11/32 1 23/32 7/8

Spindle Tooling for Manual and CNC Lathes. http://www.hardingeus.com/usr/pdf/collet/2348E.pdf, p.

43.

All portions of this document not noted otherwise are Copyright © 2011 by David M. MacMillan and Rollande Krandall.

Circuitous Root is a Registered Trademark of David M. MacMillan and Rollande Krandall.

This work is licensed under the Creative Commons "Attribution - ShareAlike" license. See http://creativecommons.org/licenses/by-sa/3.0/ for

its terms.

Presented originally by Circuitous Root®

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