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Home made crank puller

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Old 01-14-12 | 07:09 PM
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Originally Posted by dscheidt
Junkyard. It's used as the thread on some japanese axles.
Car axles? Bicycle rear axles are M10x1.0 and fronts are M9x1.0.
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Old 09-08-14 | 05:45 AM
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Originally Posted by Drummerboy1975
I want to make a crank pulled for my '81 Fuji Royale. Is this possible? I don't see why it would be an issue.

With that said, what would I need to do this?
I don't know what the threading is like on your bike. I made my own crank puller for my bike for $3...probably could have done it cheaper if I knew what I was looking for and went to a dollar store. I brought my bike with me to test different bolts in the threading and everything in the auto, outdoor and lighting dept the threading was too big. I finally found a kitchen tap airator adaptor that fit perfect. The only problem is the big hole. I found a bolt that friction fit it soft soldered it in place and hand screwed it into my crank with the crank bolt still on but loosened and voila. The crank arms came off. As for the crank shaft, a piece of pipe i used a table mounted grinder to make the square teeth and a hole drilled in the side of that . Insert screw driver and twist.
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Old 09-08-14 | 06:26 AM
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You can glean some info from the Park Tool website: Park Tool Co.

e.g. the crank threads are 22x1 mm
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Old 09-08-14 | 10:38 AM
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Originally Posted by buzzzzzzz
I don't know what the threading is like on your bike. I made my own crank puller for my bike for $3...probably could have done it cheaper if I knew what I was looking for and went to a dollar store. I brought my bike with me to test different bolts in the threading and everything in the auto, outdoor and lighting dept the threading was too big. I finally found a kitchen tap airator adaptor that fit perfect. The only problem is the big hole. I found a bolt that friction fit it soft soldered it in place and hand screwed it into my crank with the crank bolt still on but loosened and voila. The crank arms came off. As for the crank shaft, a piece of pipe i used a table mounted grinder to make the square teeth and a hole drilled in the side of that . Insert screw driver and twist.
A kitchen tap aerator adaptor didn't break? Soft-soldering held it together?

Price the time of your labor at minimum wage: now how much did it cost? I bought mine for $5: it's worked for 20 years.
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Old 09-08-14 | 11:25 AM
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Originally Posted by fietsbob
maybe.. if the threads of the crank arm extractor portion have already stripped out.
then a more crude type of tool grabbing the back side of the whole arm,
and pushing the BB axle out, like an automotive pulley removal tool, might work.

might be some of the options you have left..
But even the auto puller is cheap enough ,
some bike shops have one for the last resort removal
I bought a bike with the last resort:
[IMG]133_PaTrek by superissimo_83, on Flickr[/IMG]
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Old 09-08-14 | 11:40 AM
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One bodge.. take the bolts out, ride the bike until you loosen the arms from the spindle..
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Old 09-08-14 | 03:06 PM
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Originally Posted by Drummerboy1975
I am a Machinist. I can make it. I just need measurements. There nothing to it really.

Actually what I need is one to go by and I'll make it.
Sounds like a cool project. You should take pics as you work, and come back and post. At least a few would be interested to see it, although as you can tell from this crowd, most will mock you for wasting your time. But hey, it's your time!
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Old 09-08-14 | 03:07 PM
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Originally Posted by fietsbob
One bodge.. take the bolts out, ride the bike until you loosen the arms from the spindle..
I like that idea! Find a parking lot and ride figure 8's mashing on the cranks until they get loose!
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Old 09-08-14 | 05:25 PM
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Aw hell. Just use a hammer and cold chisel.
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Old 09-08-14 | 05:29 PM
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I have a lathe. Two in fact. Not that I'm that good on them.
Ever try to cut a thread on the inside of a bore?
I bought my crank pullers.

I would love to see Drummerboy do this tho'
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Old 09-08-14 | 05:56 PM
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I think lathes are for the outside. The inside would be drill & tap, right?
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Old 09-08-14 | 06:18 PM
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No. You could but, one can cut threads in a bore on a lathe, too. And it is probably more accurately done on a lathe. I have the tooling for doing it, but so far haven't attempted it.
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Old 09-08-14 | 06:25 PM
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I just read this thread again. You're a machinist, Drummerboy? Well then, heck yeah. Why not .

If you need pics or measurements of, say, a Campy style puller, lemme know.

I think this would be a cool project. I wouldn't attempt it as I am no machinist but, for an experienced hand, it would be great. You could even get fancy.
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Old 09-08-14 | 10:02 PM
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Once I watched a machinist make a puller for an old motorcycle - same style as a crank puller, but bigger. He measured the pitch on the flywheel he wanted to remove, got a smaller puller, added material to it with an arc welder, then cut a new thread with a lathe. Custom puller in 1/2 hour! Of course it would've been easier to use a bigger puller, but he hadn't one in his shop.

Last edited by Reynolds; 09-08-14 at 10:05 PM.
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