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Farmall & IHC Tractors Discussion Forum
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Cutting a flywheel

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Gauger

10-16-2006 19:21:28




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I am having a machinist friend at work put a fresh finish on the pressure plate and flywheel from my SH. It seems to me that I should have him take the same amount off of the mounting surface for the pressure plate cover as as he takes off of the pressure plate and flywheel combined in order to keep the dimension between them the same. Sound logical??




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Bill in Oh

10-17-2006 09:51:26




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 Re: Cutting a flywheel Gauger in reply to Gauger, 10-16-2006 19:21:28  
I personaly would not cut the flywheel on a lathe. i would prefer the grinding machine over the lathe.what happen with lathing is the die pulls metal anywhere there is cracks or hard spots that the naked eye can't see.I just got in from the machine shop with a 1066& 1486 flywheel that was ground he took 0.60 from one 0.48 from the other.really nice job on them he ground top decks& lower decks the same 80 bucks each.hopfully while not on the dozer today i will get one of these jewels back together the guys around here won't even consider the lathe on these big tractors them flywheel will explode.SH maybe?

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Janicholson

10-17-2006 12:28:14




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 Re: Cutting a flywheel Gauger in reply to Bill in Oh, 10-17-2006 09:51:26  
0.480 and 0.600 is a vast quantity of material!!! Is this what was removed? JimN



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Bill in OH

10-17-2006 18:13:25




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 Re: Cutting a flywheel Gauger janicholson in reply to Janicholson, 10-17-2006 12:28:14  
That was supposed to be 0.048 0.060 I suspect you are one of them guys that notice everones mistakes over than yours. i suspect you are one that knows whats wrong with it how much it cost whats size tools i need and how long it takes& jack down the said you have to take the left rear inside dual off leave the out side one on to put the number 3 cam shaft baering in???? Now do you want to FU-- with putting the cluch back in the 1486????? ?? you know i made a mistake on the 1066 1486 flywheel thats a hep a loy of wheel to make a FU--ING mistake like that on 800 bucks for a new one HE-- of a mistake?

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Janicholson

10-18-2006 13:12:50




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 Re: Cutting a flywheel Gauger janicholson in reply to Bill in OH, 10-17-2006 18:13:25  
I make my share, and I expect to get told. I have known individuals that lighten flywheels for throttle response and different clutches. If taking off 1/2" could be done, I and others might have interest in knowing. My question was innocent of flame. Newbies, and even experienced mechanics with no experience on a particular machine could be taking notes and making mistakes. Sorry to have irritated you. JimN

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gauger

10-17-2006 10:12:34




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 Re: Cutting a flywheel Gauger in reply to Bill in Oh, 10-17-2006 09:51:26  
I've decided to leave the flywheel alone since it is as flat as a pancake and not scored. The pressure plate looked a lot worse so I took a few thousandths off on the lathe. Textbook says to grind the plate too but it turned out real nice and my machinist said the benefit of the added friction from the cross hatch finish that grinding gives is polished out fairly soon.



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Gauger

10-17-2006 05:17:56




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 Re: Cutting a flywheel in reply to Gauger, 10-16-2006 19:21:28  
OK, I did a little reading off site and indeed the accepted technique for refacing a flywheel or pressure plate is Blanchard grinding. I am fortunate that the shop where I work can handle that too. And yes, the mounting surface for the cover must be trimmed or the amount of pressure that holds the clutch disc to the flywheel will be diminished.



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Wardner

10-17-2006 09:18:37




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 Re: Cutting a flywheel in reply to Gauger, 10-17-2006 05:17:56  
I am not sure but I think a Blanchard grinder can only be used on a flat flywheel. As I recall, the Blanchard is a large abrasive wheel that rotates horizontally above the flywheel that is on a carriage which moves back and forth like a Bridgeport table. It will take alot of passes before it cleans off the irregular surface hardening of a flywheel. Moreover, how do you tell when the hard spots are gone? The net effect is a flywheel that only grabs the high (hard) spots after break-in.

But whatever floats your boat is fine with me.

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scotty

10-17-2006 09:27:53




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 Re: Cutting a flywheel in reply to Wardner, 10-17-2006 09:18:37  
Wardener, You are correct, a Blanchard Grinder can only be used on flat surfaces. They come in a variety of sizes, and the grinding stones can be changed for different abrasive grits. They are very effective for removing significant amounts of material whether it is hardened or not. They use flood coolant to keep the work piece cool and grit free. I ran a 4ft Blanchard for a short time while serving my apprenticeship.


scotty

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workhorse

10-17-2006 04:35:54




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 Re: Cutting a flywheel in reply to Gauger, 10-16-2006 19:21:28  
After cutting a flywheel, sould shims be added between the flywheel and crankshaft to make up for the metal removed?



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Andy Martin

10-17-2006 05:12:42




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 Re: Cutting a flywheel in reply to workhorse, 10-17-2006 04:35:54  
NO!



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the tractor vet

10-16-2006 19:41:02




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 Re: Cutting a flywheel in reply to Gauger, 10-16-2006 19:21:28  
There is a a set hight that the step should be cut to and at this moment i can not give it to you as the wife just took all of my books and put them upstairs as tomarrow the office is getting tore up for a remodel maybe one of the other guys might have them but since you took off the pressure plate and also removed whatever amount from the face of the flywheel everything has changed . This may not have been a wise move on your part as it will affect the pressure that the plate can apply . One other thing is that when refacing a flywheel it should be ground not turned on a lathe .

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VAJerry

10-16-2006 21:46:15




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 Re: Cutting a flywheel in reply to the tractor vet, 10-16-2006 19:41:02  
NAPA had the measurement for my Super A.



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Wardner

10-16-2006 21:37:39




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 Re: Cutting a flywheel in reply to the tractor vet, 10-16-2006 19:41:02  
I think the chief reason a flywheel should be ground is due to the irregular surface hardening that occurs on its face.

I successfully cut a SMTA flywheel in my lathe. The first cut was terrible. Very lumpy due to the coin sized hard spots. There were probably twenty of them. The second cut penetrated the hardened spots and looked good. I put a rounded tool in the tool holder for the finish cut. I did this ten years ago and cannot remember total depth of cut but I doubt it was over .060. The finish was very smooth. I removed the same amount from the shoulder where the pressure plate bolts. I didn't cut the pressure plate. I exchanged it or bought it outright. I wanted the new springs.

I am not really sure how a machine shop grinds a stepped flywheel such as used on the SMTA. I can't visualise how a grinder copes with the raised shoulder,

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jmixigo

10-17-2006 04:09:22




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 Re: Cutting a flywheel in reply to Wardner, 10-16-2006 21:37:39  
By useing a small grinder with the wheel dressed back to a 45 degree angle mounted on the tool post of a lathe. Slow but a real nice job.



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