Please help me decide which set up to chose for my gantry:


36" length
THK 20mm Linear rails and trucks
1/2"-8 4start Roton Acme screw
(1) 425 oz-in HobbyCNC motors
Luc's THB6064AH bipolar drivers 6064: 4AMP Stepper Motor Driver Kit. massmind
44v Power supply

Attachment 242504
This channel bar is 6" so the rails can be spaced at 4.5". It's very heavy. With it, the gantry will weigh almost 80lbs(36kgs). Which brings me to another question - Will it move at a reasonable speed using the the single driver/motor/acme screw/PS combo above?

Attachment 242502
This one is a 4" channel bar with the rails positioned as shown, on the top. If mounted on the side, there's only 2.5" space between them (Not enough, I presume?).10 to 12lbs lighter than the first one.

Thanks in advance for your advice.

Jordan