[fido]

I have a 10" vertex rotary table on the way. I would like to add 4th axis to my bridgeport series 1 cnc.
Original control is gone. 80v DC supply, campbell board, 3 larken drives. mach 3 software.
I will be plugging the 4th into the Y driver. Maybe adding a 4th larken later on.

I am thinking a nema 42 directly connected to the hand wheel. Is the 42 overkill? Any sugjestions would be appreciated.
I won’t be doing anything too aggressive or fast. I will be engraving gun barrels, fluting barrels and bolts mostly.

Thanks for any help.
Stephen

[Karl_T]

I put about the same rotary table on my mill. I used a pair of pulleys with an 8:1 reduction to the table. And then the table had another 40:1 reduction.

With this much reduction, a very small servo will drive the system. I just bought a cheap one off eBay. 600 oz/in., IIRC

Karl

[fido]

Thanks Karl

[Karl_T]

I should have mentioned I used pulleys and belts to the handwheel so I could quickly remove the servo and use the indexer in manual mode.

Karl