spindle mount

[JAZZCNC]

I'm attempting to do this setup with an SMA50 block, however, the block hole is 75mm not 80mm.

Then it's not SMA50 because the bearings are 80mm. I use them all the time and never had one 75mm.

[Neale]

I have one of these 75mm mounts sitting in the workshop at the moment which was given to me. When I measured it, I realised why it was being thrown out... When I get round to it, I'll stick it on the milling machine and run the boring head through it. There seems to be plenty of meat in the casting to do this. Only minor difficulty is that someone has already cut the slot down one side so I'll have to shim that and clamp up before boring.