Upshur gears

[Harglo]

Upshur Plans call for 20 degree PD gear cutters.
I have the correct cutters, but are for 14.5 degree ptich.
Can I get by with the same gear center distance for an ok mesh, or if not, how much change would I have to due in what direction?

 

[GreenTwin]

There are programs online where you can plug in the information, and it will give you specific gear data for a given size/cutter/etc.
I have substituted different gear sets that have different tooth counts, but the same tooth ratio (2:1), and the same center-to-center distance.
The gear experts will have to chime in here, but I suspect you could substitute gears and make it work.
.

 

[Jasonb]

There will be no difference if you use th e14.5DP, OD, tooth count and gear centers remain the same.

 

[Harglo]

There are programs online where you can plug in the information, and it will give you specific gear data for a given size/cutter/etc.
I have substituted different gear sets that have different tooth counts, but the same tooth ratio (2:1), and the same center-to-center distance.
The gear experts will have to chime in here, but I suspect you could substitute gears and make it work.
.

Many thanks yes em sure will get other info.
Harvey

 

[timo_gross]

I would say, you are good to go as long as you keep center distance and ratio. (pressure angle does not change center distance)
I used 0.5 module gears and did a profile shift. (gears run smooth)
e.g. 40/20 48DP has 0.625" Center distance and 42/21 Module 0.5 has 0.6201" center distance. Leaves only a small difference.

https://evolventdesign.com/pages/center-distance-calc

Greetings Timo