Tap and Die Size - Dragster
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Tap and Die Size - Dragster
Postby Sommer79 » Wed Dec 29, 2010 9:33 am
I just bought a rusty old dragster and need to retap the part that holds the pedals. Does anyone know the tap sizing for this? Cheers.
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Re: Tap and Die Size - Dragster
Postby rkelsen » Wed Dec 29, 2010 11:06 am
Beware that the left hand side is left hand threaded to prevent it coming undone. I don't think you can buy pedals with an oversized spindle, so you might have limited options if the threads are stuffed.
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Re: Tap and Die Size - Dragster
Postby GraemeK » Wed Dec 29, 2010 11:57 am
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Re: Tap and Die Size - Dragster
Postby Mulger bill » Wed Dec 29, 2010 3:46 pm
London Boy 29/12/2011
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Re: Tap and Die Size - Dragster
Postby rkelsen » Wed Dec 29, 2010 5:52 pm
'Tis a brave man who disagrees with Sheldon and Jobst:Oxford wrote:Pedals are threaded left and right to make them come undone, in the same way the BB is left/right threaded (opposite to the pedals) so that if the pedals or BB bearings seize, they will actually unscrew from the crank/frame. Its a throwback to when all bikes were fixed gear, if the pedals did not unscrew to loosen, the fixed gearing would quite literally rip your feet off at the ankle and/or throw you off the bike.
http://www.sheldonbrown.com/gloss_p.html#pedal
"Another popular theory of armchair engineers is that the threads are done this way so that, if the pedal bearing locks up, the pedal will unscrew itself instead of breaking the rider's ankle. The left-threaded left pedal was not the result of armchair theorizing, it was a solution to a real problem: people's left pedals kept unscrewing!"
http://www.sheldonbrown.com/brandt/left.html
Couple questions: How long have you been riding? How many pedals have you seized?
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Re: Tap and Die Size - Dragster
Postby rkelsen » Wed Dec 29, 2010 7:59 pm
It's got nothing to do with them seizing. It's all about the prevention of loosening by precession. It's the very same reason that cars used to have left hand threaded axle studs for their left wheels, back in the days before engineers discovered the miracle of cone-seated wheel nuts.Oxford wrote:Note that the pedal thread and BB thread (for an English BB that is) are opposed for the reasons I stated already.
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Re: Tap and Die Size - Dragster
Postby Wild Turkey » Wed Dec 29, 2010 10:01 pm
I have many NOS dragster cranks. I may sell some off if it helps you out.
You can clean up a thread buy finding a bolt (or pedal shaft) the same thread. With an angle grinder cut 1 or 2 grooves along the length of the thread. Run it in with cutting compound or just c r c. The leading edge will cut/clean the thread. A better result can be gained by coming in from the back of the hole. The thread there will get you started straighter. We call them a thread chaser. Just a thought.
I busted a pedal out of the alloy crank an old ladies bike 13kms from home once. I had to cable tie my foot to the other pedal and ride with 1 leg!
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Re: Tap and Die Size - Dragster
Postby rkelsen » Thu Dec 30, 2010 10:16 am
Thankyou!Oxford wrote:Precession may help keep them tight when pedalling
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Re: Tap and Die Size - Dragster
Postby Sommer79 » Thu Dec 30, 2010 11:31 am
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Re: Tap and Die Size - Dragster
Postby Mulger bill » Thu Dec 30, 2010 6:27 pm
Any good bike shop should have the tools for the job, ring around your area.
London Boy 29/12/2011
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Re: Tap and Die Size - Dragster
Postby Sommer79 » Thu Dec 30, 2010 7:04 pm
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Re: Tap and Die Size - Dragster
Postby Mulger bill » Thu Dec 30, 2010 7:22 pm
THIS is a handy guide to sizing. In fact the late Sheldon Brown is a great place to bookmark.
Tapping, facing and chasing is one of the few jobs I will let the LBS handle, the cost of the tools for the job is too high for the amount of work I'd give them.
London Boy 29/12/2011
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Re: Tap and Die Size - Dragster
Postby Sommer79 » Thu Dec 30, 2010 7:38 pm
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Re: Tap and Die Size - Dragster
Postby Sommer79 » Thu Dec 30, 2010 8:12 pm
Yep Northside and I work at Stafford Heights so I will give them a call and drop in. Was put off by my local a little when they weren't keen to help. I know a little about retro cars and drive a 73' TA22 Celica but bikes are a new 'toy'. Thanks heaps for advice.Oxford wrote:what side of Brisbane are you on? if northside try Ridgeways in Stafford, they'd appreciate the old bike, it will fit right in with the shop.
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Re: Tap and Die Size - Dragster
Postby Hodaddy » Thu Jan 13, 2011 1:47 pm
From my experience he is correct but I had no idea why they were designed to undo in the pedalling direction.
Thanks Oxford for the logical answer.
Hodaddy
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