Crank balancing. Question ?

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Crank balancing. Question ? Empty Crank balancing. Question ?

Post  whitefield on September 19th 2014, 10:02 pm

I have recently had a crank balanced and was wondering where the right or wrong place to grind or to,remove material from the crank ? Crank was new in the box. Thanks
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Post  rmcomprandy on September 20th 2014, 1:05 am

whitefield wrote: I have recently had a crank balanced and was wondering where the right or wrong place to grind or to,remove material from the crank ? Crank was new in the box. Thanks

Where ever it needs to have weight added or removed ... it is never exactly the same place for all different bob weights.

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Post  IDT-572 on September 20th 2014, 8:10 am

If it needs a bunch off the counter weights I have reduced the diameter of the counterweights to get close and then a finish balance.
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Post  whitefield on September 20th 2014, 10:16 am

It seems to me they removed a lot of material from the throw area. Didn't know if it would weaken that area of the crank.
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Post  kim on September 20th 2014, 11:27 am

Thats what we had to do on mine. Had to cut the counter weights down quit a bit. The billet lost almost 3lbs when all said and done.

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Post  IDT-572 on September 20th 2014, 12:06 pm

kim wrote:Thats what we had to do on mine.   Had to cut the counter weights down quit a bit.  The billet lost almost 3lbs when all said and done.
. Cool
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Post  rmcomprandy on September 20th 2014, 8:17 pm

whitefield wrote:It seems to me they removed a lot of material from the throw area. Didn't know if it would weaken that area of the crank.

That would depend upon how and exactly where it is done.

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Post  whitefield on September 20th 2014, 10:22 pm

rmcomprandy wrote:
whitefield wrote:It seems to me they removed a lot of material from the throw area. Didn't know if it would weaken that area of the crank.

That would depend upon how and exactly where it is done.

I will try and take some pics and if they turn out ok I will post them and see what you guys think . Thanks
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Post  IDT-572 on September 26th 2014, 2:00 pm

I have had them wit the cheek above the rod pin completely ground down on the sides................ No problem.

Taking it out of or from the overlap area then it would weaken the crank. Also reducing the rod pin diameter to much as in offset grinding to increase stroke will to. (nothing to do with balancing.............. just saying) Cool
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Post  kim on September 26th 2014, 2:53 pm

Ive done that on a couple cranks. Instead of having to put in a 50 gram slug. Take that bit o ridge off the counter side. Very careful application of small grinder wheel.

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