Model Engineers' Workshop (Digital)

Model Engineers' Workshop (Digital)

1 Issue, May 2022

Dismantling and Servicing a Grip-Tru Chuck

Andy Johnston explains how to get inside one of these top quality lathe chucks.
Dismantling and Servicing a Grip-Tru Chuck
The chuck I am dealing with is a 4inch Pratt Burnerd three-jaw, specially made for a Myford ML7 lathe. It is approximately 40 years old so you may find different arrangements on any later, updated versions, photo 1. Under most circumstances, when cleaning is required, it is possible to just remove the jaws with the chuck key as usual and with a small screwdriver blade scrape out any swarf in the scroll whilst turning it with the chuck key and clean the jaw teeth and slides but don’t add oil or grease. Complete dismantling should only be necessary occasionally. However, this does necessitate resetting the centralisation upon rebuilding. Complete dismantling should only be necessary occasionally. However, this does necessitate resetting the centralisation upon rebuilding. The body is mounted with three…
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Model Engineers' Workshop (Digital) - 1 Issue, May 2022

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