Toleracing of center distance with internal gear

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SUMMARY

The discussion focuses on the tolerancing of center distance for internal gears ordered from Rollix, specifically with a center distance of 331.494 mm. The backlash specifications are 0.98 mm at maximum and 0.53 mm at minimum, with a module of 10 and a tooth count of 79 for the bearing and 13 for the pinion. The main issue raised is selecting the appropriate tolerancing grade for the bores to ensure a proper fit with the pinion and bearing shafts. Participants suggest using pitch diameters to layout centers for the bearings and shafts to achieve tangential alignment.

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  • Understanding of internal gear mechanics and specifications
  • Knowledge of tolerancing standards and grades
  • Familiarity with backlash concepts in gear systems
  • Experience with pitch diameter calculations and layout techniques
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Mechanical engineers, gear designers, and manufacturing professionals involved in the design and assembly of internal gear systems will benefit from this discussion.

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
 
Last edited by a moderator:
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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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