JM Performance's High Torque Retention Knobs Lower Chatter
JM Performance Products has launched a specially designed High Torque retention knob for V-Flange tooling that the company says reduces chatter and tool wear.
Share
JM Performance Products Inc. (JMPP) says that its High Torque retention knobs solve many long-standing challenges of V-Flange tooling, including toolholder expansion and short tool life.
The company says V-Flange tooling’s troubles exist because steel maintains its elastic properties even after hardening, and threads create torsional stress. The stress exerted by the engagement of the threads of the retention knob with the threads of the V-Flange holder at the holder’s small end often distort the holder. Once expanded or distorted, the holder no longer pulls all the way into the spindle, stopping short of full engagement. This leads to the small end of the taper making contact before the large end at the gage line, allowing the holder to move randomly within the spindle in a manner JMPP describes as much like a bell-clapper.
This random movement translates to vibration and chatter, which negatively impact tool life. JMPP says toolholder expansion caused by standard retention knob installation reduces toolholder-to-spindle contact by 70% or more, and that carbide tool life diminishes by 50% for every .0005” distance short of full engagement. The company also says less than 75% taper contact with the spindle results in poor TIR (runout) and tolerances, as well as excessive spindle wear and tear.
JMPP’s High Torque retention knob uses the lowest available threads in the toolholder to prevent this issue, with a relief beneath the pilot especially important to the effectiveness of the design. The company says its design is compatible with any toolholder that meets industry specifications.
As the knobs are subject to high stress and wear, JMPP recommends replacing them after three years in single-shift settings, after two years for when operating the knobs for two shifts or after a single year of three-shift work.
Related Content
-
PowRgrip Responds to Three Tooling Trends
Rego-Fix’s PowRgrip tooling system has expanded over the past 20 years to incorporate a wider range of tool sizes, as well as automation.
-
Making the Most of Mixed Toolholder Assemblies
While nearly all ER systems will have cross compatibility, they’ll have small differences across manufacturers that make their implementation at the shop level not as standard.
-
Jergens Pull Studs Enable Quick Changeovers
SP140 and K02 pull studs offer quick-change solutions for vise or gripper jaws, electronic component manufacturing, packaging machines, medical technology and automation.