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GripTru Chuck Pin stuck!

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Martin King 208/03/2017 14:17:44
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1129 forum posts
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Hi All,

Got 3 Griptru chucks and just started to dismantle the first smallest one which is basically quite good but one or two dings and filthy inside.

All went OK until I tried to remove the last of the 3 chuck key gears. The small retaining pin has sheared off at the screwdriver slot, (not me, already done!) and despite gentle heat, WD40 and tapping etc will not budge! Cannot remove the scroll for cleaning until this is out.

Any thoughts please?

Cheers, Martin

vintagengineer08/03/2017 21:33:25
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469 forum posts
6 photos

Drill it out with a lefthand drill.

daveb08/03/2017 21:51:33
631 forum posts
14 photos

That sounds like an EDM job! Cheaper than messing up the chuck.

Martin King 208/03/2017 22:12:55
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1129 forum posts
1 photos

EDM?

Martin

David Standing 108/03/2017 22:19:09
1297 forum posts
50 photos

Electrical Discharge Machining - spark erosion wink

Martin King 209/03/2017 16:26:07
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1129 forum posts
1 photos

All sorted! I carefully centred the hole with the pin using a conical centre in the top of the hole then heart in mouth plunged a 2.5mm solid carbide slot mill gently down and down. Finally the remaining little stub started spinning and out it came! Made a new pin and job done.

Cheers,

Martin

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