JA4-60 Gripping a Small-Diameter Workpiece
A small-diameter part projects from the JA4-60. A lever indicator touches the part to check the installed grip. This close view is useful for small shafts, where the contact length, projection and indicator contact force all affect the inspection setup.
How the grip works
The built-in pneumatic cylinder flexes a metal diaphragm. Its gripping segments move with that small elastic deflection. The grip does not depend on conventional jaws travelling along long slideways. A replaceable diaphragm collet is finished to match the part. External gripping closes onto the outside diameter. Internal gripping expands against the bore.
Choose the gripping direction from the machining datum. Gripping inside a bore leaves the outside diameter accessible. For a slender shaft or thin wall, set the contact length, overhang and clamping force together. After mounting, check the chuck datum first, then the gripped part.
What to check in this setup
- Keep unnecessary part projection short.
- Use light, stable indicator contact.
- Check the part position with the grip engaged.