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Dimension across pins, ANSI B92.1

Dimension across pins, ANSI B92.1

Dimension across pins, ANSI B92.1

(OP)
I'm trying to specify internal splines using ANSI B92.1 I've gotten through everything but the dimensions across pins just fine, here is what I have so far:

ANSI B92.1-1996 Internal Involute Spline
Class 5
Fillet Root Side Fit
Teeth: 36
Pitch: 16/32
Pressure angle: 30
Base Dia: 1.949"
Pitcch Dia: 2.25"
Major Dia: 2.363"
Form dia: 2.317"
Minor dia: 2.188"/2.193"
Circular space width: 0.0982 (MIN)

The trouble is when I get to measurment between pins. I'm using a pin diameter of 0.108, but I don't understand how I'm supposed to arrive at dimension between pins from the equations in B92.1.

Specifically: "inv (phi i) = s/D + (inv (phi D) di/Db)"

What is "inv"? I've never seen this function before.

 

RE: Dimension across pins, ANSI B92.1

Inv is the involute function.

inv(phi)=tan(phi)- phi in (phi in radians).

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