Stripped thread repair advice please

[Jon GibbsParticipant @jongibbs59756]

Hahaha, yes. I found an M7 x 1 plug tap last night but no 1/4" BSF.

Here in the wilds of Cumbria and with the cost of fuel in the UK it is almost certainly cheaper to buy consumables on-line and have them delivered than to drive to borrow something, bring it back and use it and then do another return trip to return it .

Then you've got it somewhere tantalizingly in the workshop, almost certainly never to be found again, the next time you want it.

Jon

[Russ BParticipant @russb]

I just repaired a brake caliper bracket on my mates motorbike, the hole was completely stripped.

I used a MAP pro gas with "Durarod" to fill the hole and then drilled and tapped etc.. The Durarod is much stronger than the original casting and will mate dissimilar materials, I'm sure there are other alloys of it for other purposes.

have a search on youTube to see what it can do, and how it works – as I couldn't clean up the surface before starting with a wire brush I cleaned it with thinners and ran a tap through it to expose some fresh metal.

all in all, I was done in well under an hour from start to tidied away, it now tightens so well it makes the other hole seem worn.

[Jon GibbsParticipant @jongibbs59756]

Hi Russ,

Thanks – that certainly looks very easy.

I don't think it's ideal for this job as the casting I'm trying to repair has some bearings pretty close to the stripped threads I don't want to disturb but definitely worth considering for future jobs.

Thanks again

Jon

[LambtonParticipant @lambton]

Jon,

Thinking about the Suggestion from Michael Williams about finding a new L/H lead screw bracket from a dealer in second hand Myford parts there must be quite a number of these items available as they are no longer required by people who have retro fitted the QC gearbox to their ML7.

I had one for example that came from my super 7 when I fitted a gearbox.

Put a wanted ad in the classified ads on this site and on Homeworkshop.

A good second hand part will be better and probably cheaper than a properly repaired one especially if you have to by taps etc. for a one off job.

Eric

[Jon GibbsParticipant @jongibbs59756]

Thank you for the suggestion Eric.

I'll try the repair first – but if there's a problem with it I will certainly follow your advice.

Jon

[LambtonParticipant @lambton]

Jon,

Good plan. There is a L/H lead screw bracket complete with quadrant on eBay at present.

Best regards

Eric

[LambtonParticipant @lambton]

Jon,

I have just found another bracket on eBay £15 buy it now. Looks perfect. Being sold by heritage lathes.

Eric

[Jon GibbsParticipant @jongibbs59756]

Eric,

I feel pretty daft – I bought the lathe off Ebay but didn't think of looking for spares there .

I have already spent more than £15 on bits to fix the old one but never mind. It's even the right colour – the only problem is that the oiler is the wrong type – my lathe has the old flat oilers.

Anyway, I will stick with plan A now and if I cock it up I'll revert to your plan and buy one off Ebay. They seem fairly common as you so rightly suggested.

Thanks again though

Jon

[Jon GibbsParticipant @jongibbs59756]

Well I successfully did the deed last night and she is now fixed and back up and running

Finally plumped for two M10 stainless steel inserts loctited into tapped holes in the casting with 1/4 BSF threads up the middle.

Thanks very much for all the suggestions and help.

Jon

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Jon Gibbs on 26/02/2014 08:55:58:

Finally plumped for two M10 stainless steel inserts loctited into tapped holes in the casting with 1/4 BSF threads up the middle.

.

Well Done, Jon

… Should be better-than-new !!

MichaelG.

[LambtonParticipant @lambton]

Finally plumped for two M10 stainless steel inserts loctited into tapped holes in the casting with 1/4 BSF threads up the middle.

Excellent job Jon well done.

Eric

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