Chasing large diameter internal threads

[DomP]

I've got a cb550 rear hub from a member on here but the internal tread on the bearing retainer is a bit damaged a few threads in, I've googled it but can't find a way to clean up the damaged thread other than at a machine shop.  Does anyone have a home workshop method of cleaning it up?

[MCTID]

I'd use a good Machine Shop.

Mine was a tight fit with the internal locking ring and as I had a really difficult struggle to dismantle it, I didn't want a future owner to have the same problems.

As the hub was dismantled, the Machinist only cost a few quid and I was much happier when the two parts went back together smoothly.

[Bryanj]

Its a LH thread and you can use a thread file

[DomP]

Thanks MCTID.

can a thread file be used internally Bryan?

[Bryanj]

Well i have done it using the corner of the file, takes time but doable

[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]

Thanks MCTID.

can a thread file be used internally Bryan?

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.

[McCabe-Thiele (Ted)]

Could the tight spots be due to the remnants of the four stake marks?

[DomP]

Could the tight spots be due to the remnants of the four stake marks?

I think so Ted, it winds in fine but for the slightest bit of resistance it those points.  I think a bit of working back and forth with some grease today might sort it. 

I've ordered a tap and die set to tap the carb bracket to take an m4 dog point screw which should be the final part to getting the carbs back together, just the top end to assemble engine wise then.  Next step is making a seat base and cowl, I've been watching tutorials on Easy Composites website to make a mouldless carbon or fibreglass part...looks like good fun!

[Bryanj]

Dom, have you the proper tool for tightening the retainer?

[DomP]

Dom, have you the proper tool for tightening the retainer?

I don't Bryan, I'm not quite at that stage yet mate,  I'm contemplating powdercoating the rims and stainless spokes but Christmas has been expensive!