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Whilst still on the rotary table, and with the milling head back in the vertical position, I drilled six, 10mm, equi-spaced holes for mounting the tranny to the adapter plate.
Fortunately, the quality of the German casting is very good so the remaining, ring of 5mm thick aluminium is remarkably round and true requiring only minimal dressing with a file.
The replacement aluminium ring was mounted on our old Colchester lathe and machined to fit perfectly over the end of the tranny casting.
The ring was pressed onto the transmission and the 4.3mm drill was used to continue all the holes through the casting. The ring was removed and all the holes in the casting were opened up to 5mm for the fixing screws.
The ring was then clamped to the rotary table and a series of 4.3mm holes (M5 tapping size) was drilled right through from the outside edge to the inside edge. These would eventually all be tapped M5 from the inside edge.
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