Gear Pinion outside diameter calculation
Gear Pinion outside diameter calculation
(OP)
Hello,
I need to make 3 new helical gear pinions with the same type of teeth of the attached picture (sample gears)
How can I calculate the outside diameter D for each of the new pinions. Z1=20 , Z2=22 and Z3=24
I have measured the outside diameter of the 2 sample gears:
Z=40 , outside diameter= 173,5 mm
Z=25 , outside diameter= 111 mm

I need to make 3 new helical gear pinions with the same type of teeth of the attached picture (sample gears)
How can I calculate the outside diameter D for each of the new pinions. Z1=20 , Z2=22 and Z3=24
I have measured the outside diameter of the 2 sample gears:
Z=40 , outside diameter= 173,5 mm
Z=25 , outside diameter= 111 mm


RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
How did you came up with those numbers?
RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
I also drawn the shape of the teeth. See attached file
RE: Gear Pinion outside diameter calculation
RE: Gear Pinion outside diameter calculation
The gear thickness is 40mm. They are from a very old wire drawing machine (around 1950s) and yes I need new pinions and I dont have any other information about the gears except those samples which are originals
Could you explain what is a "profile shifted gear"?
As you said: The goal is to correctly identify the gears and manufacture a set of good replacement. I know that probably the best approach should be to send the gears to a gear shop and ask them to manufacture the pinions accordingly by just telling the number of teeth that I need but there are no good gear shops around here and I personally dont trust them at all
RE: Gear Pinion outside diameter calculation
By "profile shifted gears" I mean gears with addendum modifications.
Let us know how we can help you further.
RE: Gear Pinion outside diameter calculation
We are starting to machine the gears today. Material is steel grade SAE 8620 and they will be case hardened after they are finished
I am using Occupant`s diameters