Final diameter fo cutting teeth

[DalboyParticipant @dalboy]

I call them teeth as it is not a gear. I need to cut what I best describe as a saw tooth to make a ratchet wheel which I will cut using a 60deg cutter, My question is if the drawing states that the diameter of the PCD needs to be 7/16″ would my calculations be right that I need a 15/32″ diameter piece to start with.

 

[JasonBModerator @jasonb]

I think ratchet wheels take the PCD at the crest of the teeth so 7/16 blank.

[JasonB]

On JasonB Said:

It would depend on tooth count, less teeth the larger the OD needs to be.

Sorry forgot to put the tooth count in the opening post as that is part of the calculation. There are 30 teeth

[JasonBModerator @jasonb]

Did you see my edit. as they take the pcd as teh OD tooth count won’t matter.

[JasonB]

On JasonB Said:

Did you see my edit. as they take the pcd as teh OD tooth count won’t matter.

Just seen it. Thank you for the information at last I have some rod already at 7/16″

[JasonBModerator @jasonb]

If it helps I get 0.025″ cut depth which leaves a very small flat top to the tooth when I set the cutter 0.020″ below ctr line

[DalboyParticipant @dalboy]

I did wonder if I should leave a small flat on top of each tooth, and you answered that before I had chance to ask it. Thank you for the other info on depth of cut and the 0.020″ below centre height. Will be getting the devviding head out and set up tomorrow hopefully.

[John HaineParticipant @johnhaine32865]

You can also cut a ratchet with a slitting saw, though needs 2 passes.

[DalboyParticipant @dalboy]

Managed to cut 2 ratchets I think the top one is the one I will go with. I had to cut them a little over the 0.025″ depth

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