Gear Terminology Question 1

[lumpyrugger]

I deal with European OEMs quite often and was wondering if anyone knows the difference between these three terms related to gearing specs:

Profile Shift
Profile Offset
Correction Factor

In the US we use "Profile Shift" to indicate how much the gear is to but cut under or over pitch diameter.

 

[dinjin]

Correction factor is a ratio of the
addendum vs 1.00 times the module
addendum. So if for example they
show 1.25x, subtract 1.00 and it shows
the .25 x the module is the profile
shift.

 

[dinjin]

as to profile offset,
they generally refer to
it as x.m where x is ratio
which you multiply times the
module and it give you the
profile shift in millimeters.

 

[lumpyrugger]

Thanks for your response dinjin. I understand the reason for a profile offset, but what is the correction factor doing?

 

[dinjin]

Simply another way of defining or preference in showing how much the cutter is withheld. Any of these definitions work. Certain gear programs may ask for one of these instead of the others.

 

[dinjin]

You may also see k.m which is a way of showing if the
addendum is shortened by k times the module,
Example x.m = 1.25m k.m = .10m, then the addendum is 1.25m minus .10m equals 1.15m addendum.