I realize (realise) you are just drilling the holes, Tony but seeing your photo of the timing belt hub reminded me that Hass came out this week with a carbide insert for forming the tooth profile. The geometry is here but I found their video quite interesting. Around 0:42 they describe the 3 popular tooth shapes. I instantly thought of your ELS and other possibilities, as well as indexing the lathe spindle on a manual lathe. So many interesting things to do!
I tried to post a clickable link for the video but it looks like YouTube has taken control and now plays the video (in large size). I find it annoying because it clutters up the post so I shoved it to the bottom of this post.
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