Gear cutting (metric)

[RickG]

Hey out there,

 

I have got a question I need to clear up.

 

I have a gear called out as such,

 

246.0 Dia.

240.0 P.C.D.

80 Teeth

3.0 m

20' pressure angle

 

I want to make sure I get the right gear cutter

to do the job.

I think I need to get a #7 cutter size

and a 10 Diametral Pitch.

 

Am i doing this right?

 

Thanks in advance,

Rick

[RickG]

Does anyone know where I can find out if this is correct?

[Bruce Caulley]

Machinery's handbook should have it. I should know the answer off the top of my head because I used to do a bit of this, but i'm having a brain fade at the moment. I will have a dig around tonight and let you know what I find.

 

Bruce

[RickG]

I think I found it as this formula ...

Diametrical Pitch = 25.4 / 3

Or 8.4667 ...

 

So the closest to standard is 8.

 

And if I understand correctly the cutter number goes backward of standard teeth.

 

so 1 becomes 12 to 13

2 is 14 to 16

and so on ...

 

So I really need a #7 x DP-8 ... ?

[Bruce Caulley]

formulas

 

I think you need to talk to the tool supplier and order a module 3.

 

Bruce

[Bruce Caulley]

How did you go Rick?

[pip]

BC10146

 

on the button with tool suplier and module 3 cutter.