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Jammed insert.

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Carl Wilson 428/07/2016 13:32:12
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670 forum posts
53 photos

Have some similar to these but they are German, Optimum if memory serves. Like the man said the bottom screw is a cam affair.

Raymond Anderson28/07/2016 13:39:48
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785 forum posts
152 photos

Here is a locking pin from a Walter 25x25 most work this principle. There is a carbide insert seat not shown in the pic as thats not relevant to your query. Not sure if your chinese toolholder works on this principle or not,. most industry standard ones do. The brown stuff you may be able to see on the screw is high temp grease. I always give the innards a wee coat everytime I change an insert.

cheersimag1325.jpg

Rik Shaw28/07/2016 15:38:40
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1494 forum posts
403 photos

Thanks for all your input which I found mostly helpful. I still could not remove the pin so I used a sharp edged drift and tapped either side of the insert and eased it of the pin. Once the insert was of I managed to unscrew the pin with an allen key quite easily. I shall have to remember in future that when I replace an insert the pin only needs “nipping” rather than tightening.

Now I can see what makes the pin work. It has a taper on the small location diameter which can be just seen in the photo. This taper pulls the insert back into the pocket when the threaded pin is tightened - Rik

lathetoolpin.jpg

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