depths for keyseats?

[Gary]

I have 5 5/8 keyseats to mill in a 2 7/16 shaft and forgot my book at the day job. Does anyone have a chart or a formula for calculating the depths i need to mill these. I am not finding anything online as of yet thanks in advance Gary

[Racer X]

I will assume these are standard square keys in a straight shaft.

 

According to machinerys handbook....

 

For milling keyseats, the total depth to feed the cutter from the outside diameter of the shaft to the bottom of the keyseat is M+D where M is the chord height based on key width and D is half the key width. Therefore the formula is M=1/2(shaft diameter-the square root of (shaft diameter squared-key width squared).

 

Or M=.5(2.4375-the square root of [5.9414-.3906])

 

M = .0407

half of key = .3125

depth is .3532

 

If you can interpret my translation of the formula I would strongly suggest you double check my math after the day I have had.

 

Hope this helps.

 

cheers

[Lee.]

+1 Moto.

[Gary]

thanks guys thats what I found myself. Job is done and I came up with the same numbers as you. Been along time since I got to mill some keys. Thanks for the reply's. This place rocks.