TOPIC:

Spoke to the guy at the machine shop. He says he didn't case harden it because he was worried about warping the sprocket. I asked what it would cost if I wanted to do it and just take that risk. He said about $100. YIKES!

That seems pretty high to me. He said it'd take about an hour or so. With a shop rate of $75 I guess that's what it's going to cost.

I'm about $100 into this already between the used gear and the machining so far. I'm not sure it's worth dropping another $100 into this.

No, mrFluffy, it wasn't you.

Les

The heat treat place can do different levels of hardness. My guess is that this boss is softer than the rollers but hard enough to hold up to normal use. A heat treat shop should be able to do a "prick" test on the sprocket to let you know how hard it is.

I would have made a sleeve ID about .001-.002 smaller than the boss, had it hardened and shrunk the sprocket in liquid nitrogen and slightly heat the sleeve and dropped it on the sprocket.

My .02 worth

Hope this helps.

Steell I was just using that to ref. the part's I know it's
not a plant gear.

les holt wrote: Sorry, taking my response down. I'd go to another site and ask what to do.

Les

how does sending someone to another "site" help our site grow?

leon

Go to an engineering site or a Mechanics site that has grounded information, not opinion so the unsuspecting, uneducated person that reads this doesn't spread the BS/bad ideas as fact next time this same question is asked. Like many other unfounded bits of info that are still keep popping up on this site year after year.

I'd rather not see this grow farther into a city of fools!

This isn't aimed at any one! it's just FACT!!!

Les

les holt wrote: Go to an engineering site or a Mechanics site that has grounded information, not opinion so the unsuspecting, uneducated person that reads this doesn't spread the BS/bad ideas as fact next time this same question is asked. Like many other unfounded bits of info that are still keep popping up on this site year after year.

I'd rather not see this grow farther into a city of fools!

This isn't aimed at any one! it's just FACT!!!

Les

A long time back, when I was a Mod, I kept getting PM's from some dude that insisted that I must edit posts because so much inaccurate info was being presented. And of course he knew all the correct answers and would tell me what to edit.

Was that you?

No, it wasn't me, I just prefer to not muddy the waters. I made a suggestion and decided it may not be the correct one and decided to remove it. That's all

Les

Steell and Les, you are two of the guys who's opinions I trust the most. So I appreciate those opinions even when you disagree. Even when you aren't 100% sure.

I'll take opinion (at least when grounded in experience) over going it alone any day.

My 2 cents worth - case hardening here costs about $150 (minimum charge) and will warp most parts. The worst thing is it will close a hole slightly so if you have a tight fit you will have to hone it back to size. Case hardening also is only a few thousands of an inch thick. A good gear shop should be able to make a new sprocket - your price may vary.

I decided to go ahead and install the part and see what happens without it being case hardened. I figure in a couple hundred miles and after a handful of starts I'll take it apart and inspect it to see if there's any visible damage. I'll keep you posted.

Topper wrote: I decided to go ahead and install the part and see what happens without it being case hardened. I figure in a couple hundred miles and after a handful of starts I'll take it apart and inspect it to see if there's any visible damage. I'll keep you posted.

That's what I would do. I like to try things myself to see if what someone said is true. Bountyhunter said one time that 60 seconds at full 12 volts would destroy a coil, but that didn't seem believable to me.
I fried a brand new Accel coil in a hair less than 30 seconds.
Cost me $60 to learn something, but I won't forget it


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