Key-way fix - anyone try it?

[john hall]

Originally Posted by mjsoldcub

depends if you know a machinist

maybe 20-50 bucks

Get a quote before you let a shop do the work. Our shop does basically nothing for the general public. It would be $75 min. An old school shop, retiree with a mill in his garage, possibly even an automotive machine shop would be who I would look for. Even a GOOD maintenance man at a factory--probably has acess to a milling machine.

[ol'George]

I prefer to mill a new keyway 90* from old one, not *180.
---------Done a few over the years.
Or, you could mill a wider keyway in the old location, and make a step key, if it is not wallowed too bad.

[Terry C]

Originally Posted by ol'George

I prefer to mill a new keyway 90* from old one, not *180.
---------Done a few over the years.
Or, you could mill a wider keyway in the old location, and make a step key, if it is not wallowed too bad.

90 is what I do also.

[Berwil]

Originally Posted by ol'George

I prefer to mill a new keyway 90* from old one, not *180.
---------Done a few over the years.
Or, you could mill a wider keyway in the old location, and make a step key, if it is not wallowed too bad.

Originally Posted by Terry C

90 is what I do also.

Your reasoning is....? Does the shaft get a flat spot or something 180 from the key way and can affect the new key? I'm just curious is all.

Bill

[cubs-n-bxrs]

Yes I have done about 4 keyway repairs to date. I weld up the wallowed out area very carefully with a mig welder and then take the crank and a 12 pack of beer to the machine shop dept. Couple days later I have a very nice reworkrd crankshaft.

[ol'George]

You have less of a chance of any problems @ *90.
if another keyway is cut @ 180 then you have a chance of problems later on.
In an industrial situation, we had to look @ all angles so to speak,as
our machines/equipment ran 27-7, 365.
Downtime ran in the thousands of dollars a minute.
anytime you can prevent a problem or plan downtime, it was a plus.

A shaft cut @ *90 will not tend to become undersize/wallow like it will @ *180
Just like setscrews, they are set @*90.

[mortten]

Running those machines 27-7 is hard on them

[Jeff in Pa]

Originally Posted by Alvy

Sounds like a job for Mr. PA. First name Jeff In

Originally Posted by mjsoldcub

depends if you know a machinist

maybe 20-50 bucks

Originally Posted by Sam Mac

I would get in touch with member JeffinPA. You could box up the crank and send it to him. Before you do that I'd have it check to see if it needs to be ground.

Send me pictures, pretty sure I can do it.

Jeff

[coakes00]

Jeff in PA - I'm trying to get my students to get it tore down before Christmas break so that I can get it checked and order an overhaul kit so it will be here before school resumes in January. I'll be able to get a picture of the keyway this afternoon but probably won't have the crank completely out till the end of the week to know if it needs to be ground as well.

[coakes00]

Finally got some picture of the shaft. It was a real pain to get the clutch basket off because the key was deformed and wouldn't allow it to slide. It was about every time you started it that you had to put the starter belt on because the clutch basket wouldn't stay tight without wobbling.

I noticed that the set screw had worn the side of the shaft at 90 degrees cw. Would it probably be best to get the new keyway cut at 90 ccw from the old? And I know where the vbelt runs on the basket has some issues with being pinched in, would it be a good idea to just get a new one of them too?