ASME B29.22 Diagram of Sprocket Tooth

Can you post the drawing?

If used only for looks in a drawing, and not for actual manufacture, it should be possible to make a good approximation with four circular arcs per tooth.

If the sprocket's drawing is difficult to read then work backwards from the specifications of the chain. Considering the actual function of the sprocket will help. The centre spacing for the sprocket valleys is equal to the chain pitch. For 6 teeth you will have 6 valleys. The centre spacing is a chord length not a sector. Do the geometry and math to work out sector length, then centre line circumference and so on. Considering this may even give you a clue as to where the dimension leaders actually point to and thereby save you from doing the math or finding somebody on the payroll to delegate the task to. Is there a standard sprocket database that you can import into Solidworks? If so, buy it.

Hopefully you can see it.

For my particular chain,

P=4.031 d=1.375 Cp/2=0.5 G=2 H=.1875 R=.25

I calculated Dp=15.575 Dpa=15.551 Do=16.419 Dr=13.669

I've dealt with roller chain and agricultural chain sprockets many times. In this case, I cannot understand the function of all the parameters. For example, it appears the line representing pitch is connected to the points at 360/N and also Dpa, which I assume is Pitch Diameter Adjusted. Except that mathematically, it could only be coincident with the actual Pitch Diameter.

This is getting complicated now. If this is a commercial application then a chain and sprocket vendor's pre-sales engineer might be able to help you.

As with many drawings on CR4, this one is rather blurry (others are often grayed out). The text is too small to read. It would be nice if the rollers of the mating chain were shown, but at least it does imply six teeth. Why the recesses between adjacent teeth?

With this type of sprocket, 6 sprocket teeth actually seats 12 links of chain around. The chain is different than roller chain in that only every other link can sit over a sprocket tooth. The other links sit on the flat between the sprocket teeth. Google Image "Drop Forged Rivetless Chain" so you can see the chain style and picture how this works. The recesses are a relief area that allows for attachment protrusion. There is another tooth form for these chains which does not have the recesses, but they do not work for applications like slaughterhouse lines which require slider attachments.