1/2" tap info needed
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Fleet Mechanic
Joined: Feb 2009
Posts: 1,672
Likes: 20
From: Nixa
1/2" tap info needed
The previouse owner of my BMX bike welded one of the pedals on.So I have to cut the pedal out, and retap the hole. What I need to know, after looking on Ebay for a tap. All the taps have numbers after the size, example 1/2" 20 or 1/2"14 etc. Is the number, the threads per inch?
I'm not sure how to count threads per inch, since the threaded part of the pedals aren't 1" long, and I don't have a thread guage. Any ideas on this too?
I'm not sure how to count threads per inch, since the threaded part of the pedals aren't 1" long, and I don't have a thread guage. Any ideas on this too?
Posting Guru
Joined: Jun 2002
Posts: 1,146
Likes: 0
From: Colorado
Yes, the number following the size is the number of threads per inch in this case. To determine the threads on your pedal, simply count the number of threads over a known fraction of an inch, and multiply by the reciprocal of the fraction. Example, thread count over a 1/2 inch distance is 10. Reciprocal of 1/2 is 2, thus you have 20 threads per inch. In most cases you can just estimate the known distance and count as the difference in threads per inch should be very obvious.
Thread gauges are pretty cheap and can eliminate the uncertainty as well as possibly mistaking metric threads for standard.
Thread gauges are pretty cheap and can eliminate the uncertainty as well as possibly mistaking metric threads for standard.
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Fleet Mechanic
Joined: Feb 2009
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From: Nixa
Well thanks guys. I'll pull a pedal off today and count the threads. Or else I'll go HF and get me a guage.
The pedal in on the right side, so I am thinking it the regular direction threads.
The pedal in on the right side, so I am thinking it the regular direction threads.
Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
> welded one of the pedals on
If you are thinking about tapping welded metal, the weld material might be harder then the tap. You may might have to force a sleeve in there and tap that or ream the hole out to the base metal and tap that instead.
Just thought I would mention that in case you were buying an expensive tap and did not want to nuke it. fwiw
If you are thinking about tapping welded metal, the weld material might be harder then the tap. You may might have to force a sleeve in there and tap that or ream the hole out to the base metal and tap that instead.
Just thought I would mention that in case you were buying an expensive tap and did not want to nuke it. fwiw
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Fleet Mechanic
Joined: Feb 2009
Posts: 1,672
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From: Nixa
I'm pretty sure the person ground down a 9/16" pedal to fit the hole and welded it on the back side and the front side. I don't know that for sure yet. If that is the case, all I have to do is grind down the back weld, and probably cut off the pedal then hopefully after a bit more grinding, knock out the peice, then tap the hole again. in theory it should work.
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
it has been my miserable experience that the threads are fine thread AND one side is left, the other right. time for a new pedal crank?
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Fleet Mechanic
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From: Nixa
If I have to get a new cank, is the tube (where the bearings are) a standard size, or are there different sizes?
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Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
back i nthe day - when the bikes were still nice...there were like 2-3 sizes and they went across manufacturers. now, that everything is built in china - Id be less inclined to be positive...
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
There generally are two sizes, large and small. If the pedal cranks are all one piece, and just bent steel (sounds like they are) then it's usually a large bearing. If the cranks bolt onto the center crankshaft, then it's a small bearing.