sheared bolt

[fred]

Handle on Altendorf saw side fence sheared off (This handle only requires finger tip pressure to lock but ........ wasn't me guv. The original machine operator never broke it in 15 years. His replacement did it in short order. I use the saw regularly and haunt broken it but No.1 son had a go and ........) It snapped off deep in the socket. I tried screw extractors but no luck. I drilled right through the broken part with a 5.5mm drill hoping to dislodge it. Nope. Screw extractor just locks up. In the absence of other suggestions I propose to try re-tapping the hole. The replacement handle measures 9.5mm across the threads so I assume thats an M10 (.If you haven't guessed I'm a bit out of my depth here) Is re-tapping the best way out of this? Could I risk a larger bit though I'm afraid of damaging the threads? Anything els to try ?

[Fredxx]

Be very wary of using screw extractors and breaking them. That really compounds the problem.

Assuming your drill is well centralised I would drill with a bigger bit so it nearly breaks through, and then try and remove the broken piece using a punch or similar to work the broken stud around.

It may also be possible to use a tap to remove the remnants.

Some would also advocate a left handed drill but they are very expensive.

Another alternative is to completely drill the part out and use a heli-coil repair kit.

[David]

Just a thought. If it is snapped off deep in the socket, is there enough thread for a shorter bolt?

Cheers

Dave R

[fred]

No such luck :-(

[fred]

Because the break was in the socket. and it was very ragged, I was unable to guarantee centralising the drill bit

I have managed to drill all the way through the broken piece and had ben hoping at that stage I would be able to knock out the remains, but that panned out.

I'll keep trying

thanks for you help

[Chris Bacon]

A picture of this would help visualise the situation (from online source, or uploaded, e.g. to imgbb).

[Chris Bacon]

On 18/10/2021 16:39, Chris Bacon wrote: > On 18/10/2021 13:16, fred wrote: >> Handle on Altendorf saw side fence sheared off >

[Tim Lamb]

A suitable sleeve might serve to centralise a larger drill bit for a further attempt. My experience of tapping a fresh thread is that the original invariably loosens and rotates with the tap!

>

[newshound]

+1, the devil is in the detail. Apart from the exact material, how much "meat" is available?

One fix that I have sometimes done which may not be appropriate in your case, if attempts to remove and/or re-tap leave you with a "ragged" hole, perhaps with some partial threads, is to glue a length of studding permanently into the bolt hole using epoxy (either with or without steel loading) and then retain the moving part with a wing nut or other suitable female-threaded object.

[AJH]

help centre holes, left hand bits give a fighting chance