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Turning a crankshaft


 
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Fritz Maurer
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PostPosted: Mon Dec 03, 2012 6:52 pm    Post subject: Turning a crankshaft Reply to specific post Reply with quote

How does a machinist know the diameter of the next undersize? I'm taking a crank to a shop who probably does not have a listing for a W-12. I was planning on getting the bearings from Rice's, but I am hesitant to have them provide the dimensions to the machinist; if the crank turns out wrong, I'm stuck with it. I would rather the guy doing the job find out for himself. I have never heard of a crank being refused for lack of information, that's why I wondered if there was some other way of checking the diameter. Thanks, Fritz
 
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David G
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PostPosted: Mon Dec 03, 2012 6:55 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

There are reference books for crankshafts that the machinists will use.
 
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Earl-IL
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PostPosted: Mon Dec 03, 2012 7:26 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

Email sent on specifications. Earl
 
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teddy52food
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PostPosted: Mon Dec 03, 2012 7:32 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

I used to grind shafts. We had a book that had the forging numbers of cranks and the specs. Journal sizes and stroke . Also listed the undersizes of bearings available. A shop with a grinder will have the info too.
 
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notjustair
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PostPosted: Mon Dec 03, 2012 7:40 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

I have always either had the machinest supply me with bearings after doing the grinding or write down EXACTLY what I am to get. It seems like you are putting the cart before the horse.
 
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Fritz Maurer
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PostPosted: Mon Dec 03, 2012 7:57 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

What * if * he * can't * get * them ?
 
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Owen Aaland
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PostPosted: Mon Dec 03, 2012 8:11 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

Fritz Maurer wrote:
(quoted from post at 23:57:17 12/03/12) What * if * he * can't * get * them ?


He starts by checking to see what is available for bearings before turning the shaft.
 
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mike1972chev
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PostPosted: Tue Dec 04, 2012 6:03 am    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

The BEST machine shops will usually refuse to do machine work WITH OUT the new replacement parts in hand. Tolerances could be slightly off.The BEST guys are checking everything BEFORE turning them down.If not,you can end up with sloppy machine work,or even worse,a "junk" un useable crank shaft. If they ARE a GOOD shop,they should be able to produce any engine bearing made.If not,I would question their back ground in doing crank shafts myself.

BTW,My engine guy WILL NOT EVEN think about boring a block with out the new pistons,or any other major work with out the replacement parts sitting right there with him.
 
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gene bender
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PostPosted: Tue Dec 04, 2012 6:48 am    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

Let the machine shop take care of the bearings or just let them turn it so its ready for the new bearings if it has to turned over 30 thous get another crank. They will know what the specs are.
 
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ihcowner
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PostPosted: Tue Dec 04, 2012 12:20 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

A W-12 has the same diameters as the A,B,C, cranks. The rod bearings are the exact same and the mains will work with a little grinding.
 
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El Toro
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PostPosted: Tue Dec 04, 2012 1:57 pm    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

The machinist should have a manual that covers all or most farm tractors. Hal
 
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teddy52food
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PostPosted: Wed Dec 05, 2012 6:37 am    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

Just from memory , rods are 1.7495 & mains are 2.1245.
 
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Bill Krosnicki
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PostPosted: Wed Dec 05, 2012 7:59 am    Post subject: Re: Turning a crankshaft Reply to specific post Reply with quote

Fritz Maurer wrote:
(quoted from post at 04:57:17 12/04/12) What * if * he * can't * get * them ?


I'm pretty sure he can get them, the w-12 has the same engine as the F-12 and parts for them are widely available.
 
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