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Fixing sheared thread

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Alpha-9
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Joined: 19 Jan 2012
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PostPosted: 12:42 - 23 Sep 2012    Post subject: Fixing sheared thread Reply with quote
Hi

When the mechanics forced some crap mirrors that didn't quite fit onto my bike/when I crashed and broke them, it seemed to have fucked the thread, now my new mirrors wont fit in the right side

Any tips/products for repairing the thread?
I don't have a drill though, was looking at thread repair kits but they all seem to need a drill

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Islander
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PostPosted: 12:50 - 23 Sep 2012    Post subject: Reply with quote
If the thread's stripped, get it helicoiled.
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janner_10
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PostPosted: 12:53 - 23 Sep 2012    Post subject: Reply with quote
As above or you maybe very lucky and be able to tap it out with the same size, this rarely works though.
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jeddy11
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PostPosted: 13:06 - 23 Sep 2012    Post subject: Reply with quote
As above get a tap and clean the threads if its just cross threaded then this should sort it out....good luck
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kestrel
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PostPosted: 17:15 - 23 Sep 2012    Post subject: Reply with quote
Remember that the right side mirror may be a left hand thread!
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Matt-
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PostPosted: 17:20 - 23 Sep 2012    Post subject: Reply with quote
Simple, get a tap the correct size

slowly screw it in the damaged thread
Keeping the tap straight in the damaged hole.

Screw in very slowly, ( with some engine oil or 3in1 )

Once tap is in fully, un- screw.

Now fit new mirror, same for other side.

If that doesn't work get a helicoil get of eBay Smile

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Rogerborg
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PostPosted: 20:09 - 23 Sep 2012    Post subject: Reply with quote
The YBR has a reverse thread on the RHS mirror: you'll need a magic one.
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Pete.
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PostPosted: 21:13 - 23 Sep 2012    Post subject: Reply with quote
Seems strange to have a left hand thread on a right hand mirror stem. Wind pressure would tend to want to un-screw the thread. On the left it would tighten the thread.
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Raffles
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PostPosted: 21:52 - 23 Sep 2012    Post subject: Reply with quote
Pete. wrote:
Seems strange to have a left hand thread on a right hand mirror stem.

'Tis indeed strange, though not unique. My Duke has L/H threaded mirrors on both sides.
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Alpha-9
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PostPosted: 09:41 - 24 Sep 2012    Post subject: Reply with quote
lol I don't think i've tried "turning it the other way"
Didn't occur to me, I always follow the lefty loosey, righty tighty rule Laughing

Did eye it up and it looked damaged, will have another look later


I don't really get how taps work or helicoils!
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MarJay
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PostPosted: 09:52 - 24 Sep 2012    Post subject: Reply with quote
Babyyam's other half explained this at the BBQ, its so that if you hit something it unscrews rather than snaps...
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Islander
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PostPosted: 09:54 - 24 Sep 2012    Post subject: Reply with quote
Alpha-9 wrote:
lol I don't think i've tried "turning it the other way"
Didn't occur to me, I always follow the lefty loosey, righty tighty rule Laughing

Did eye it up and it looked damaged, will have another look later


I don't really get how taps work or helicoils!
Googleo Googleo, wherefore art thou googleo?


Taps are a bit like a very sharp bolt designed to cut into metal and produce a threaded hole that's the right size and pitch for a standard bolt to fit into. They can be used to clean up a thread that's got the remains of a stripped bolt in it or to produce a new thread in a freshly drilled hole. Dies are the 'nut' equivalent of a tap and cut threads onto an appropriately sized piece of rod.

Helicoils are used when an internal thread has been damaged beyond repair (stripped out). They work by replacing the lost thread and have a thread on the outside as well as on the inside. To use them you drill the damaged thread out to a suitable larger diameter, tap it to the size and pitch of the outside thread of the helicoil, and then screw the helicoil into the newly tapped hole using a special tool. This leaves you with the internal thread of the helicoil which is the same size and pitch as the original, damaged thread.

Bit of a simplified view but you should get the idea. Thumbs Up
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Islander
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PostPosted: 09:55 - 24 Sep 2012    Post subject: Reply with quote
Vincent wrote:
Pete. wrote:
Seems strange to have a left hand thread on a right hand mirror stem. Wind pressure would tend to want to un-screw the thread. On the left it would tighten the thread.


The idea is that, if you come off, the mirror gets knocked loose rather than break.

I could do with a L/H thread on my 400 as the mirror mount is part of the master cylinder casting and it's easy to damage in a fall and expensive to replace.


Ah. That makes sense. Thumbs Up
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Alpha-9
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PostPosted: 10:06 - 24 Sep 2012    Post subject: Reply with quote
Interesting and helpful, thanks Thumbs Up Karma

Hopefully will just screw in the opposite way lol, will update later to see if I need a tap etc Thumbs Up
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Raffles
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PostPosted: 11:10 - 24 Sep 2012    Post subject: Reply with quote
Vincent wrote:
The idea is that, if you come off, the mirror gets knocked loose rather than break.

Both of my mirrors have L/H threads. I'll have to try to remember to only crash on the offside Razz
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barrkel
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PostPosted: 11:39 - 24 Sep 2012    Post subject: Reply with quote
Vincent wrote:
Raffles wrote:
Both of my mirrors have L/H threads. I'll have to try to remember to only crash on the offside Razz


Well that is unusual. What bike is it?


My Honda SH300 has left hand threads for both mirrors, but the stalks the mirrors screw into are themselves right hand threaded in their attachment points on the handlebars. So they can come undone with too much force either way.
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Raffles
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PostPosted: 12:11 - 24 Sep 2012    Post subject: Reply with quote
Vincent wrote:
Well that is unusual. What bike is it?

KTM Duke II on a '52 plate.
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Raffles
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PostPosted: 12:33 - 24 Sep 2012    Post subject: Reply with quote
Vincent wrote:
Typical Austrians........they just have to be different Rolling Eyes Very Happy Are the mirrors interchangeable?

Nein.
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Alpha-9
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PostPosted: 11:53 - 26 Sep 2012    Post subject: Reply with quote
lol thanks guys

Was a left hand thread Thumbs Up
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