GripTru Chuck Pin stuck!

[Martin King 2Participant @martinking2]

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

[Martin King 2Participant @martinking2]

[vintagengineerParticipant @vintagengineer]

Drill it out with a lefthand drill.

[davebParticipant @daveb17630]

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

[Martin King 2Participant @martinking2]

EDM?

Martin

[David Standing 1Participant @davidstanding1]

Electrical Discharge Machining – spark erosion

[Martin King 2Participant @martinking2]

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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