[Konvas] Magazine Gear Pitch

[Peter Haas]

On Nov 6, 2008, at 4:00 PM, Adam Frey wrote:

> I was wondering if anyone knew the gear pitch of that large gear?  
> My mathematical skills seem to keep coming up with 31.667p for some  
> reason, instead of a more standard 32p. I keep counting 95 teeth,  
> and it looks like it's a 3 inch diameter. I do measure the diameter  
> from the center between the valley and peak of the teeth, correct?  
> The mathematical equation should be P=95/3.

For gears made using the diametral pitch system, the PCD (pitch  
circle diameter) is # teeth / DP, whereas the diameter of the "gear  
blank", which is also the diameter of the completed gear is (# teeth  
+ 2) / DP.

(95 + 2) / 32 = 3.0313", so very likely the gear is indeed 32 DP.

32 DP gear cutters are easily available.

BUT ... you DO need to know the PA (pressure angle), for which 14.5º  
and 20º are the common standards.

It is conceivable that the gear was made using the Module system,  
which is common in metric system countries.