Home made crank puller
 

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?

a lathe. you are better off buying one

I agree. for the precision involved it would be inpossible without a lathe or a high quality drill press and some good taps.

if the removal threads are damaged you can sometimes use a gear puller but this is very cumbersome and tiring work and I have no idea how one would do it on the nondrive side.

Are you a machinist? (I ask a bit facetiously, because it's obvious to me you're not) Then just suck it up and go buy one.

i am a cheap irish bastard and researched this when I needed a crank puller a year ago. I ended up buying one. they are like ten bucks

lol

Ten? You got took for a ride!
Kidding... but I did get mine for hella cheaper. $3.95 for a no-name knock-off of a Park CWP-7C universal puller.

The threads on the most common type of crank arms that the puller screws into are M22x1.0 mm. You will never find a bolt with that threading in any hardware, auto parts or home center store. So, unless you have access to a good lathe and the skill to use it, pay the $15 or so for a proper commercial one.

there is actually a debate on this over in the C&V threads. while I agree it could be done, if you have the training and equipment, I think your better off buying one.

http://www.bikeforums.net/showthread...cquire-use-one

The "debate' is over finding and paying for a puller for the now obsolete and relatively rare TA cranks with their M23 threading. Pullers for the much more common M22 threads are easy to find and relatively cheap. The OP has an early '80's Fuji. The probability of it having a TA crank is infinitesimal.

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

True but some of the things mentioned still apply here, like finding a bolt to fit the cranks to begin with, or the die if you intedned to make it from round stock. also even though that tool may cost between $30 and 50 I still think you are better off buying one rather than try and make it

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.

so you need to buy one and use it as a pettern to make one. then return it and use the one you made to take the cranks off your bike?

actually you need to concentrate on making Campi style brake drop bolts that you can produce for $10 ea and then sell for $25 ea.

http://i.ebayimg.com/t/Bicycle-Brake...-W!~~60_12.JPG

http://www.ebay.com/itm/Bicycle-Brak...item256b5ab59a

+1 I applaud your efforts. I would take on something with more value, like the Campy drop bolts, or a Stronglight crank puller.

The male threads on most crank pullers are M22x1.0 mm and cut at least 10mm of thread length. You can cut that thread on a suitable diameter steel rod, say 1" or so diameter. The female threads for the screw press aren't critical as to size and form but I'd use a fairly fine thread pitch to get adequate leverage. The screw press diameter on my Shimano puller is about 12 mm so consider tapping it M12xXX or 1/2"-XX where XX is the smallest pitch you can find and buy a suitable length matching hex bolt as the press bolt. Turn the inner bolt with a box wrench or socket matching the hex diameter.

Most commercial pullers have a roller tip on the press screw so they turn easily over the spindle end. A 3/8"or 9/16" bearing ball may be a suitable substitute.

This is a lot of work and machine time to save ~$15.

Its not about saving money. I want to make one and say I did it. And I know that it will be well made and will last.

Grade 8 or so M22x1 bolt.

Drill hole through center.

Tap drilled hole to desired threading.

Insert matching bolt into drilled out M22 bolt.

Good luck.

Source?

Not likely to find a 22x1 bolt in stock. Standard ISO pitches are 2.5mm coarse or 1.5mm fine for that diameter. Lathe is the only option, I think. As well as a crank extractor like the one described by HillRider, I also have one that came as an option with my CoolTool. It is very minimalist, not much more than 20mm in height, the depth of the crank threads plus some flats for tightening it in place. The back end is threaded for the moving part of the chain link extractor, which then bears on to a small piston which slides in the extractor body on O rings. The piston has a domed front face to keep it centred in the axle during extraction. Used within last 7 days! There's not a lot of force needed to get the cranks off the taper, and this works a treat.

Drummerboy, please will you post some pics of your finished article?

I understand it will be an interesting exercise in machining and should be fun to make. However, decent commercial crank pullers (like my Shimano TL-FC10 or Park's equivalent) are well made, properly heat treated and will outlast you and your children so you aren't gaining quality or durability with your home made one, just the satisfaction of doing it yourself. That alone may be worth the effort.

Here is Park Tools CW7 crank puller that you can use for ideas and as a model for your puller: http://www.parktool.com/product/univ...d-cranks-cwp-7

Even if you had the equipment and skill, the material costs and labor time would not be worth investing over just purchasing one.

Certainly, it's possible. It might even be fun as an exercise in developing your machining skills. The easiest way to do it would be to go out, buy the proper crank puller, use it as a pattern for making your own and then, after hours of machining and tons of money, you'll have one that is exactly like the one you bought;)

Maybe you can get a book deal out of it like Thomas Thwaites. I don't think you could get on Colbert, however. "I built my own crank puller" just doesn't have the same zing as building a toaster:rolleyes:

Junkyard. It's used as the thread on some japanese axles.

If you see the design of a campagnolo and other brands is technically the samething.

Remember seen one that was a basically a big @ss nut that was machined around with the thread that goes in the crank and the internal bolt was whatever the nut had from the beginning.

Second option just use a piece of wood and a hammer?