New build – input/comments appreciated

[JAZZCNC]

Is 20T pulleys/idler pulleys ok for this, or should you choose larger ones?

Yes they will be fine arranged like this with nearly half the teeth engage. Don't want to go too large other wise the extra interia starts to affect things.

[ngundtoft]

I have been thinking about how to design a holder so that you can route dove tails at the end of boards.
This is not a function I will be using every day, so it should be simple and it should not compromise the machine in other ways.
I read the thread by EddyCurrent and how he has done it. It looks good and stable and I am sure it works very well.
However, I don’t want this function to interfere with the precision of the bed, so I am not too happy with the removable plate. Also, for handling, I find it somewhat impractical to have this opening in the middle of the machine. All that is needed is a jig that will hold the work piece in an accurate and repeatable position. So I was thinking of placing it at the end of the machine, as shown in the model. You simply fasten the work piece with one or two clamps. I may have to extend the cantilevers/ rails to get sufficient overhang for the spindle or alternatively reduce the length of the frame, since this machine is already getting fairly large.