Back To Newsroom
Formsprag Model HPI Indexing Clutch for Speaker Grill Punch Press Feed Drive
A manufacturer of automotive speaker grills needed a longer lasting replacement
clutch solution for use on the feed drives of their punch presses that operate at
1,400 strokes/min. The machine’s original clutches were wearing out prematurely
causing frequent periods of production downtime.
Formsprag HPI indexing clutches, with a 92 million cycle life, were selected to
meet the application challenge. HPI clutches are especially-designed to provide the
maximum in dependable, uniform, long life performance in medium- to heavy-duty
The clutches are installed on the material feed drives of the punch press machines
to provide a uniform, incremental rotation of the feed rollers with each stroke of the
press ram. The reciprocating motion of a gear rack is translated into specific and
uniform motion by the HPI clutch, advancing the correct amount of material for the
next punch stroke.
All HPI models contain PCE sprags with Formchrome® and Formsprag “Free-action”
retainers. The clutches mount on a through-shaft, with the inner race driven by a key.
The key fit was very tight for this particular application. HPI 400 models have a torque
capacity of 300 lb.ft. (407 Nm) and a maximum 2,800 RPM overrunning speed and
feature oil lubrication lip seals.
- Custom sprag design
- Sprags feature patented
- 300 lb.ft. (407 Nm)
- 2,800 RPM max
- Inner race key