Toleracing of center distance with internal gear

AI Thread Summary
The discussion centers on selecting the appropriate tolerancing grade for the center distance of internal gears ordered from Rollix, with a specified center distance of 331.494 mm. The user is facing challenges in determining the tolerancing grade for the bores to ensure a proper fit with the pinion and bearing shafts. They seek guidance on standards or formulas that can assist in calculating the tolerancing grade for this application. It is emphasized that the pitch diameters should be tangential to ensure proper alignment. The thread highlights the importance of precise tolerancing in gear assembly for optimal performance.
cherish
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Hi all,
first to say sorry if the question is repeated second time
I've order a couple of internal gears from Rollix as picture below:
[PLAIN]http://img155.imageshack.us/img155/5996/centerdistance2.jpg
The calculation from them for internal gears with center distance C=331.494 (mm)
Backslash at center distance maxi: 0.98 (mm)
Backslash at center distance mini: 0.53 (mm)
module of bearing & pinion: m=10
number of teeth: bearing=79, pinion=13
pitch dia: bearing= 790, pinion=130
...
The trouble now I'm facing is chosing tolerancing grade of center distance on bores to fit with shaft of pinion & bearing, more illustration on picture below:
[PLAIN]http://img293.imageshack.us/img293/3594/74496622.jpg
Does anyone know which of standard can be used to look up or formula to calculate the tolerancing grade of center distance in this case pls give me a help :redface:
Thanks a lot for your reading this asking
 
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The pitch diameters should be tangential.
Use that diameter to lay out your centers for the bearings and shafts.
 

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