Originally Posted by Jack000  haven't thought as far as the controller actually. I'm just going to start building the mechanics first, since I usually find myself endlessly planning and getting nothing done. I'm a decent electrical engineering student, so I might just make my own to save some money.
I was thinking old pc power supplies too actually (my old pc just died so I have one lying around). For the motors, maybe something from xylotex? They're the cheapest I could find, including ebay.
just 1 question for now:
I noticed that there's very little price difference between the 200/300/400 oz.in motors. Why would anyone buy the less powerful one? |
You are falling into the same trap that everyone does when they don't have all the facts.
The motors torque is a holding torque and it falls of as the speed of the motor is increased. The fall off is much greater in the larger motors due to its inductance and other factors.
A small machine like a Taig or similar can use the 282 oz/in to great advantage because of the 20tpi leadscrews. You need a motor that will rev compared to a machine using a 5 tpi leadscrew. And really how much torque do you need if the 282 will snap cutters like butter, what good will something with twice the torque do for you?
Drivers. G540 will run this machine at great speeds with excellent control and resoluiton.
It will also run the next 2 or three better machines unless you get into something that needs real big notors to run.
For the engineers, read the thread from mariss of gecko drives,
http://www.cnczone.com/forums/showthread.php?t=51083
about how the G540/250/251 came into being. Less than 1 year sfter it hit the forum.
Mike