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mini-dunger
 Post subject: Tapping question
PostPosted: Tue Jun 05, 2007 9:49 pm 
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Joined: Thu Jun 08, 2006 9:34 pm
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Location: Adelaide
Hi guys
I pulled a thread while tightening the drive hub to my disc today. I am going to pull the hub off and retap the thread. Does anyone have any hints or tips?. Whould I be better off to drill it out first and start fresh or just tapp it how it is?. also would I be better off using a UNC tap as its a bit courser? or should I use a UNF? or lastly there is enough room inside the disc hub to fit a bolt, should I just do that?

Oh its cast iron.
Thanks everyone

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Curly
 Post subject:
PostPosted: Wed Jun 06, 2007 6:50 am 
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Location: Gippsland, Victoria
I'd be drilling out the old thread and replacing it with a helicoil of the original size.

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Curly
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drmini in aust
 Post subject:
PostPosted: Wed Jun 06, 2007 6:56 am 
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Location: near Baulkham Hills, NSW
I'd be getting a new pair of rotors, they are pretty cheap... helicoiling an old one is not worth it by the time you buy the kit to do it.:wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Clubbie74
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PostPosted: Wed Jun 06, 2007 5:49 pm 
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One of your local engineering places might weld and tap it for you with the right inducement - cold cans.

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Michael N
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drmini in aust
 Post subject:
PostPosted: Wed Jun 06, 2007 7:21 pm 
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Location: near Baulkham Hills, NSW
Clubbie74 wrote:
One of your local engineering places might weld and tap it for you with the right inducement - cold cans.

1. You don't weld brake or suspension parts to repair them. illegal. :shock:
2. It's cast iron, welding a stressed iron component like a brake rotor is a recipe for disaster. They crack easily enough if you're unlucky, even unwelded.. :lol:

<edit> trust me, I'm a welding engineer... :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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mason
 Post subject:
PostPosted: Wed Jun 06, 2007 7:36 pm 
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I ended up doing the same thing the other day on my car.I drilled and tapped and fitted a helicoil seems to be ok have done a track day with it like that but i am still keeping an eye on it
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