you could be right there were some old 3 or 4 hit and mis engines in the leaves around old lathe parts ever where i going to post pic of anther part it was in chip pan for your oppion THANKS FOR YOUR HELPIts been many years, since I held one, but IIRC, the holes is in the 2" to 2&1/4" size. 8 to 12 HP size engines.
my thoughts also taper attachment that round piece i though might be part of tool post grinder ??? now 60 years ago i remember the lathe in the shop right up the street where i lived the man who had it would have got ever attachment it had''''' after being through around for 40 years i am sure a lot of lost parts===THANKS YOU FOR YOUR HELP BEThe Shaft part looks like part of a taper attachment.....Im Most likely wrong but thats my first impression. The circle plate I dont have a guess!
old mud got the old lathe going got to do little tuning did turn a piece of brass of course i spent a lot of time and money getting it going got nothing else to do keeps me busy --just before i took pic jerk the electric plug off ===thanks happen THANK YOU FOR YOUR HelpBill, i think now we need pics. of the lathe.