Does trimming an arm shaft effect the balance? Or, if an arm is balanced, will trimming that arm's shaft throw it out of balance?
Trimming arm shafts
Posted 25 June 2016 - 02:32 PM
It's so close to the center of rotation, trimming doesn't effect it where you'll notice it.
I've tried, a few times, to trim shafts at 45 degree angles on new arms, to reduce the imbalance, on way out of whack arms, and it did not change the numbers on the balancer.
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Posted 26 June 2016 - 03:05 AM
Yes. it will change the longitudinal balance (end to end). Will it effect performance? Unlikely.
Now we can discuss, cuss and curse balancing in two planes - again.
fwiiw - You have to solder a pinion gear on after it is balanced as it is.
Perhaps someday soon pinion gears will be small enough to grind then into the shaft.
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Posted 28 June 2016 - 08:21 AM
I generally fit a new arm,run it in for some time to make sure it settles in,trim the shaft and rebalance the thing.
But like Mike said its not a big deal if you dont although most will agree is best to try and avoid when it is possible.