SOHC.co.uk Forums > CB500/550

Chasing large diameter internal threads

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McCabe-Thiele (Ted):
I'd play safe & let an Engineering shop sort it.

My Dad would have cut four slots across a spare  retainer to make a Tap out of it.

taysidedragon:

--- Quote from: DomP on December 30, 2023, 05:27:45 PM ---Thanks MCTID.

can a thread file be used internally Bryan?

--- End quote ---

There's no problem using a thread chaser on a large diameter internal thread. The problem is with small diameter threads, the thread chaser is physically too big to get inside the hole. Ooer missus!

DomP:
Pretty fine thread on these retainers too

Moorey:

  The ends on a lot of thread files but not all are made for doing internal threads.

DomP:
I've spent quite a while with a 1mm pitch tap carefully pulling it over the damaged area, so far I've got the retainer to wind in almost fully with only a few slightly tight spots.  Pretty happy with it so far but a bit more work on the problem areas and I think it'll be good.

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