Mounting motor under table?

[Rogue]

Sorry for the delay in replying. Had ISP issues for a few days and my posts seem to intermittently require moderator approval (though I think it's when the post includes links).

Jonathan: I think I'll be looking at some kind of pocket, but I still haven't started to research the pulley systems yet so I don't know what I will need in terms of size and clearance.

AdCNC: Awesome build. This axis isn't fixed to the main structure though, it will be the X axis unit mounted on the Y axis.

[Jonathan]

Jonathan: I think I'll be looking at some kind of pocket, but I still haven't started to research the pulley systems yet so I don't know what I will need in terms of size and clearance.

I used XL pulleys , but HTD 5mm pitch is better. I've found 1/2" wide best to be fine. It's best to use reasonably big pulleys to reduce belt wear. In general minimum 5 teeth engaged with belt.

ADCNC: like the setup with the coolant etc...

[Rogue]

Fair enough, so until I settle on a firm number I'll pencil in 1 1/2" clearance from the surface of the mounting block for the pulleys. I suppose judiciously placed idlers would also help with increasing the engagement with the belt.

Is belt something that can be shortened easily, or will I be confined to designing around what is available?

[Jonathan]

Idlers shouldn't be necessary. I made the mount with the holes for the stepper motor slotted to allow tensioning the belt and different size belts and pulleys.

You can't change the lengths of timing belts - the only way is to buy a different length. You can work out the length with something like this:

http://www.sdp-si.com/cd/default.htm

Also:

http://bearingstation.co.uk/products/Belts