06-11-2017, 08:05 AM
I don't think the tolerances are that close on the outside of the piston so chucking it in the 4 jaw machine od up to the jaws then reverse and clock in again.
if that dont float ya boat Chuck up your new casting in a 4 jaw with the piston head facing the chuck which means you can see down into the underside of the piston. Now bore into the wall just stopping at the gudgeon pin bosses, now you have a reference point.
Make an expanding mandrel that fits into the bored hole, now you have a one shot deal on machining the piston, ring slots and drilled hole for the gudgeon pin. The mandrel needs to have the screw that expands the boss activated from the back end of the mandrel.
With the mandrel you can take it from the lathe to the mill for drilling ..
Anthony.
if that dont float ya boat Chuck up your new casting in a 4 jaw with the piston head facing the chuck which means you can see down into the underside of the piston. Now bore into the wall just stopping at the gudgeon pin bosses, now you have a reference point.
Make an expanding mandrel that fits into the bored hole, now you have a one shot deal on machining the piston, ring slots and drilled hole for the gudgeon pin. The mandrel needs to have the screw that expands the boss activated from the back end of the mandrel.
With the mandrel you can take it from the lathe to the mill for drilling ..
Anthony.
ieezitin, proud to be a member of MetalworkingFun Forum since Jan 2013.