Posted by Colin on February 06, 2010 at 07:38:27:
In Reply to: Re: Question about gear pitch posted by Jim Pollock on February 05, 2010 at 19:52:15:
Sorry Jim- I msread your info.
Below data on 31T/31T 6DP gears
============
Contact Ratio= 1.51
DP 6.00
Pressure angle 20.0000
Operating Pressure Angle 22.5745
Hob tip rad. 0.0786
Centre dist. 5.2580
Pinion
======
No.of teeth 31
AMC 0.2910
Addendum 0.2152
O/Dia. 5.5855
(O/D reduction) 0.0115
Root/dia. 4.8470
Hob Offset 0.0485
Total tooth depth 0.3693
Wheel
=====
No.of teeth 31
AMC 0.2910
Addendum 0.2152
0/Dia. 5.5855
(O/D reduction) 0.0115
Root dia. 4.8470
Hob Offset 0.0485
Total tooth depth 0.3693
Measuring data
==============
Min.total backlash .2
Max.total backlash .25
Fraction of b.lash on pinion .5
Pinion Hob/Cutter Offset for mean backlash = 0.1353
Wheel Hob/Cutter Offset for mean backlash = 0.1353
Pinion data:-
------------
Base tan.length over 4 Teeth 1.7276 / 1.7026
Dist.across 0.2880 Dia.pins 5.4075 / 5.3486
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Wheel data:-
------------
Base tan.length over 4 TEETH 1.7276 / 1.7026
Dist.across 0.2880 Dia.pins 5.4075 / 5.3486