Addendum Modification Or Profile Shift

What do the PCD have to do with a helical gear? Maybe you mean PCD, but that makes even less sense. Which PCD do you mean?

I also do not understand how one modifies a helical gear using any telecommunications technique. If you cannot explain clearly what you believe you have, how can anybody explain how one measures this.

Gear specifications:
No of teeth : 75
outer Dia : 199mm
pitch circle Dia: 194mm
helix angle : 14*_52'
presure angle: 20*
module : 2.5

pinion specifications:
No of teeth : 27
outer Dia : 68.45mm
pitch circle Dia: 73.45mm
helix angle : 14*_52'
presure angle: 20*
module : 2.5

Resultant: in view of above it is very clear that opinion is manufactured by profile shifted or addendum modification method.

now pls help me calculate amount of profile shift to able me to manufacture above mention pear of gears...

sorry typing error .. pls considering the follow data...

Gear specifications:
No of teeth : 75
outer Dia : 199mm
pitch circle Dia: 194mm
helix angle : 14*_52'
presure angle: 20*
module : 2.5

pinion specifications:
No of teeth : 27
outer Dia : 73.45mm
helix angle : 14*_52'
presure angle: 20*
module : 2.5

Resultant: in view of above it is very clear that opinion is manufactured by profile shifted or addendum modification method.

now pls help me calculate amount of profile shift to able me to manufacture above mention pear of gears...

This information is sufficiently detailed that I now recognize that you wish to fabricate a pair of matching helical gears. I could not tell that from your initial question.

I'm sorry but I am neither a machinist nor a mechanical engineer, so I do not know how much help I can provide you. I cannot tell you how to manufacturer either of these gears from the specifications you've given. I do not know if this is from my lack of experience, or you are still not providing some critical information. Specifically you do not specify the thickness of these gears and what material should these gears be made of. I suspect part of this problem is a translation problem from your language to English. Taking a guess that "module" should actually be shear modulus then even Aluminum will greatly exceed this low value. This implies to me that a plastic gear maybe suitable. However, there are many other mechanical moduli (Bulk, Young's, P-wave) that you may have meant that will imply a different material. I also have no idea what fabrication capabilities you have mastered.

At the very least I made you clarify what you are asking so somebody may be able to help.

I was out of town for several weeks and coming back I had a look at what happened in between. I may say that from a person of your value I would expect an other answer.

Not being a mechanical engineer but a very good master of electrical aspects I would have avoided to make the comment on the "module".

It is not a translation error from the language but a known value which is equivalent to the diametral pitch used in english units. The question was justified since due to the helix angle the values indicated can be obtained only with a profile shift.

What surprises me is that no other answer was given. Nobody knows how this has to be done?