Got a text at 7am this morning to say the Motors and drivers should be here today, thats crazy they were collected in HK at 10pm on friday night and are here this morning now thats service!!

So hopefully I should be able to add a few more pics to the component pile.

I had "yet" another question, whats the smallest or should I say recommended diameter for a 5mm pitch HTD timing belt pulley running 1:1 - is there a minimum number of teeth people would recommend (other than as many as possible) being in contact with the pulley at any one time?

The reason I ask is not for the z or the y as they are simple straight connections with the pulleys in front of each other.

Its the X where I am driving the two screws with the single belt, I can get half the way round the pulley on the left hand side however on the side with the motor I am going to have to put in some idlers to make the belt contact more with the pulley so I can nearly get about 120-130 degrees around one side of the pulley would this be enough?

I thought about doing one belt connecting the two axis and then stacking another pulley on top of the right one and driving this but my concern was "if" the belt were to snap (the long one between two axis) then one side would still be driven by the drive pulley and could cause some bending if it carried on and the other stayed still. Where as if the one belt were to go they would both stop.

Suggestions?