Originally Posted by j2sip;741674
1. What do you use to cut ordinary steel acme rods with?
[COLOR=BlueA common hacksaw is all that is needed. Just use a bench grinder or a file to ckean up the ends and put a slight bevel on the square edges to help it start in an anti-backlash nut, as well as prevent getting cut on it later.
2. Did someone of you experience bent acme rods during shipping? And damaged steppers/drives/power supplies, too. I'm living in the neck of the woods here in the Philippines so I'm pretty much concerned about the trouble of shipping damaged goods back to the US.
McMaster ships them in tubes with the rods taped together and bubble wrap around the rods in a couple of places to prevent slamming around in the tube. If the tube is damaged don't accept it it if you have the choice.
3. With the gecko and the said steppers will whipping be a problem in an almost 48" X axis leadscrew?
48" is usually not too much of a problem but 72" usually is a problem. People have successfully tweaked slightly bent rods back into usable condition.
4. The plywood in the bottom of the Y gantry is 10" and also the sides where the X bearing trucks are mounted. Will that width prevent (or at least lessen) racking in the Y axis?
Racking is a condition that is common to center driven axes. The wider the Y axis is the worse it becomes when cutting something near the ends of Y travel. Both of my machines haven't had the problem due to driving them with two lead screws and belt drive from one motor, or dual R&P drives. There are many happy users of the center driven machines.