MTS Series 646 Hydraulic Collet Grips - Manual (Page 56)

Series 646 Hydraulic Collet Grips 56 Operation
Installing a Collet for a Flat Specimen
To install a collet assembly for a flat specimen into the grip housing:
Flat Collet
1. Ensure that the grips are in the release condition and that hydraulic pressure
is turned off.
2. Clean the specimen contacting surfaces of the collet with acetone or any
other volatile solvent that does not leave a residue.
3. Apply a thin layer of Molykote G·n paste (part of the grip service kit) to the
threaded surfaces of the collets.
4. Position the rubber platen between the two collet halves.
5. Use a spanner wrench to thread the collet assembly into the grip housing
until the top surface of the collet is flush with the top surface of the grip
housing.
6. Adjust the collet assembly as necessary until the alignment mark on the
collet corresponds to the alignment mark on the grip housing.
7. Ensure that the specimen mounting openings are parallel between the upper
and lower grip. If they are not properly aligned, use a spanner wrench and
rotate the actuator rod to achieve proper alignment.
For axial/torsional systems, it might be necessary to rotate the actuator.
Alignment Mark
Spanner Wrench Holes
Coat the threads on
the collet with
Molykote G-n paste
Rubber Platen
Top View
Cutaway
Side View