I have just bought one of Arc's vertical dro's for fitting to the Tom Senior.

**LINK**

It is not quite the same as the one we have fitted to the mill drill, and I cannot fathom the Pre+ and Pre- buttons. I have tried every combination of button sequences that I can think of, but none seem to do anything. Hopefully somebody on the forum has one and can let me in on their secrets.

I found extra instructions in the box which are much more detailed, and with some practice, the extra features will become very useful. The dro was destined for the Tom Senior light vertical mill which we are working on as a replacement for the drill mill in use at present. There is very little space to fit the dro on the quill, so it has been fitted in place of the similar dro already on the drill mill. The reason for doing so is because the older unit is 1/4" narrower, and that makes it much easier to shoehorn in place between the depth stop and quill lock.