Aluminum sand casting for Chenery Gnome Rotary

[mole42]

Here's the thread about my engine: https://www.homemodelenginemachinist.com/threads/first-steps-into-a-gnome.33644/

I haven't a mill, so everything gets done on the lathe. Looking at your mill set-up, I think I'd go for the tap rather than single-point, it looks more rigid.

 

[albd5a]

Richard, thanks for all of your help. That build link is a lifesaver. Did you finish the Rotary engine? I believe the link ends short of completion. Q: that counterbored area in the cylinder boss, at top of the threads, can be done after threading the threads, correct? (For cylinder liner fuel intake).