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Originally Posted by Andy Baker
For center to center gear spacing, I use a 0.002" addition to the calculated center distance. I previously used 0.0005", but that did not allow for manufacturing tolerances.
It is better to have a slightly "looser" transmission as opposed to a "tight" transmission. I believe that this 0.002" addition for center distances is good. Also, I don't trap the gears along the length of the shaft, as I would rather let them float on the shaft as opposed to being bound tightly. Some AM customers are suprised that the gears can slide on the shaft 0.03-0.04".
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That sounds good, we added .002'' to our pitch diameter center distance this year and they sound much better. Who knows how accurate our center distances were on pre 2006 transmissions, but we never added a few thousands to the calculated center distance. Do to the nature of our transmissions, we also let our output gears float around a little bit, probably 100 thousands of an inch at most.
Good post Andy.
If you have any questions about our "Ball-Lock" method of shifting as seen here:
feel free to contact me by PM, email
bsr150@psu.edu, or AIM bsrtunkpa.