Gear cutting question

[Jim Hubbell]

Gentlemen;
I am stuck (I think) in that I am not sure how deep to set the cutter into the gear blank. Mach. Handbook and other sources talk about “whole depth” but that seems to leave out “clearance”. Thirty-two DP gears figure from .0674 in. to .0708 in. for “whole depth” depending on my source. I have built a tailstock and mandrel for my rotary table so should be ready to cut metal soon. As per my last inquiry I plan a forty tooth and a one-hundred-twenty-seven tooth gear. The pinion to be brass and the spur to be aluminum. The aluminum should outlast me and be easier to cut!

[bspooh]

Whole depth is the working depth plus clearance

brent

[John Stevenson]

Jim,
Your first figure of 0.0674" is the correct one for the whole depth which, as Brent rightly says is the working depth , plus clearance.
Usually if they are commercial cutters they have this information etched on them,
Denotes as D+f=0.0674 where D is the working depth and f is the clearance.
John S.

[kap pullen]

we always took two cuts, even on gear shapers.
Never can pick up and take the exact amount on the first part.
good knashing
kapullen