High Torque Retention Knob
The threads of a standard retention knob, when installed, place a torsional stress onto the thin walls of a toolholder, which causes the deformation of the precision taper of the toolholder and prevents the toolholder from properly mating with the spindle of a CNC machine. This expansion can reduce taper contact by as much as 70% and, therefore, no longer meets the AT3 taper tolerance specifications. (Referencing ISO 1947 angular taper tolerance (AT) specification for the toolholders is “AT3 or better”).
High Torque Retention Knobs use a precision pilot and a relief below the flange to place the force of the threads into a deeper cross-section of the toolholder. This patent-pending design, along with proper installation, will not deform the taper of the toolholder. High Torque Retention Knobs require a retention knob socket and torque wrench for installation. Packaging includes installation instructions and torque settings.
Retention Knob Comparison Drawing ZONE REV.
JM31118D-P HEAD:
JM31118D HEAD:
JMTBA TYPE 1 THREAD:
ANSI/ASME NO PILOT
JMTBA TYPE 1 THREAD:
ANSI/ASME WITH PILOT
REVISIONS DESCRIPTION
JM31118DHT HEAD:
DATE APPROVED Advantages
JMTBA TYPE 1 THREAD:
HIGH TORQUE DESIGN
HOLDER FACE
Reduced Harmonics Increased Taper Contact Improved set-up times
1.730 1.575 1.300
Precision Pilot Thread Relief
Increased Rigidity Balanced by design
UNLESS OTHERWISE SPECIFIED: NOTES: 1. ALL KNOBS ARE FOR CAT 50 TOOL HOLDERS PROPRIETARY AND CONFIDENTIAL
Applications Works in any new or used toolholder made to industry specifications.
DIMENSIONS ARE IN INCHES TOLERANCES: FRACTIONAL .020 ANGULAR: MACH 1° TWO PLACE DECIMAL .010 THREE PLACE DECIMAL .005
INTERPRET GEOMETRIC
THE INFORMATION CONTAINED IN THIS DRAWING IS THE SOLE PROPERTY OF J&M MACHINE, INC. ANY REPRODUCTION IN PART OR AS A WHOLEWITHOUT THE WRITTEN PERMISSION OF
J&M MACHINE, INC. IS PROHIBITED. 5
Material Taper Sizes
4
DO NOT SCALE DRAWING 3
2
TOLERANCING PER: ANSI B5.50-1994 MATERIAL
FINISH
ALLOY STEEL 8620H BLACK OXIDE
MFG APPR. ENG APPR. CHECKED DRAWN
COMMENTS: Q.A.
SIZE DWG. NO. A 30 40 45 50 60 HTHS - designates 9310 (40% Stronger) Traceability Laser marked with part number, serial number, and lot number.
JM Performance Products, Inc. 1234 High Street Fairport Harbor, OH 44077 1(800) 322-7750
www.jmperformanceproducts.com
discover innovate solve PERFORMANCE
PRODUCTS, INC. HT designates - 8620H
Finish Hard turned, 32 micro finish and black oxide
JM31118D Knob Comparison SCALE: 1:2 WEIGHT: 1 SHEET 1 OF 1 REV NAME DATE CAF 05-07-11 OP DWG JM31118D Knob Comparison
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