Retention Knobs Designed to Improve Tooling Performance
PMTS 2021: The high torque retention knobs eliminate toolholder expansion caused by the installation of a standard retention knob into the V-flange toolholder.
JM Performance Products Inc. manufactures products designed to ensure maximum toolholder-to-spindle contact. Its patented High Torque retention knobs eliminate toolholder expansion caused by the installation of a standard retention knob into the V-flange toolholder. The retention knobs improve tooling performance, according to the company.
High Torque retention knobs increase tooling accuracy and tolerances, improve tool life 15 to 300 percent, improve tool performance and reduce or eliminate vibration and chatter, the company says. They are also designed to improve finishes, reduce or eliminate costly secondary finishing processes, reduce setup times, extend spindle and machine life, and reduce maintenance costs and downtime.
The book on hydraulic toolholders is that they are fussy to set, fragile to operate and expensive to buy. So why do many shops choose them over other holders that seem less demanding? This Chicago mold builder has good reasons for its choice.
I’ve said that the toolholder is the least appreciated element in many milling processes, but the pull stud (or retention knob) is perhaps the least appreciated component of the toolholder.
A seemingly small amount of runout can still be too large for the tool. Reduce this runout, and tool life or productivity may dramatically increase.