Machining a Custom Mewlon to AP600E Adapter

Roughing Out
	This is the underside of the Mewlon clamp, which grabs the "puck" on the bottom of the OTA. It's a nice arrangement, but the hole spacing overlaps the mounting holes on my AP600E GTO. So I machined up an aluminum adapter to go between the two.
Roughing out an aluminum plate blank. (The lathe is a 1950's Clausing 12x36".)
Counterboring for the 600E
I center-lined it while it was still on the lathe...	... and then marked out the quadrants...	... which were then drilled and counter-bored on the mill.
(The mill is also a 1950's, the "classic" Series 1 J-head Bridgeport.)
Finish Sizing
	My lathe motor was damaged when converting to 220V and tends to overheat. So I took the bulk of the extra aluminum off on the mill using a slotting saw.
I then tapped one of the offcuts so I could bolt the plate to it. This will allow me to grip the offcut in the lathe, giving me full access to machine the outside circumference.
	The plate and offcut where then centered on the lathe and the outside diameter machined.
Drilling and Tapping for the Puck Clamp
	The puck clamp holes were marked directly from the clamp with a transfer punch. They were then tapped using the mill quill to keep the tap vertical.
Too Heavy...
	The result looked nice, but at 15oz seemed a bit heavy. So I centered up a chuck on the rotary table and popped the adapter in.
	Milling some arcs removed a bit of extra weight, but probably not enough to have made it worth-while.
Finished
A quick trip to the bead-blasting cabinet produced the finished result.