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Griptru wil not ad just

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Joseph Noci 102/04/2020 18:32:05
649 forum posts
877 photos

Richard said:

But - I can relatively easily adjust the chuck using light taps on the body with a plastic-headed hammer.

So TonySimmonds comment :

The screws fastening the chuck body to the backplate are too tight, they need to be just snugged up.

is invalid - the chuck is not 'stuck' due to the mentioned 'screws'

In fact , is is quite clear in the Grip-True and in the ROHM ZS Hi-True ( works in the same way as the Grip-True) documentation that the bolts fastening the chuck body to the spindle backplate are NOT to be loosened whilst adjusting the chuck concentricity.

Per the ROHM Manual:

Adjusting the chuck for concentric gripping

No mounting screws to be loosened for this adjustment

1. Chuck a workpiece or test mandrel and determine the
maximum indicator reading.
2. Depending on the position of the eccentricity, loosen one
or two of the adjusting screw spindles located opposite
the point of the maximum indicator reading.
3. The retighten the remaining one or two screw spindles
until the gripping centre has been corrected by an
amount corresponding to half the indicator reading.
4. Check radial run-out again and repeat the adjusting procedure
if necessary.
5. Lightly retighten the previously loosened

Richard, do the adjustment screws rotate easily? Can you loosen all three up completely, and lightly tap the body over in the direction of one of the adjusters, as far as it will go, then gently screw in that adjuster as far as it will go and observe if the body moves away from the screw?


jacques maurel03/04/2020 10:21:15
71 forum posts
17 photos


Read my article in MEW issue 292 about adjustable chucks, more will be said in the following issue about the tightening screws.

J Maurel

ega03/04/2020 12:19:47
1633 forum posts
140 photos
Posted by jacques maurel on 03/04/2020 10:21:15:


Read my article in MEW issue 292 about adjustable chucks, more will be said in the following issue about the tightening screws.

J Maurel

I'm looking forward to the solution to this "great mystery"!

ega03/04/2020 13:57:56
1633 forum posts
140 photos

One small mystery I can solve is the disconnect between the text on MEW 292 pages 67 and 68: on close examination, the first line on 68 has been near-obliterated by the red line under the pull quote at top left, which has been repeated on page 70.

Edited By ega on 03/04/2020 13:59:55

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