tivoidethuong,
There is a lot more to a good machine then the speed in IPM, so don't get all caught up in that trap, that being said, an answer for you seems impossible to say, there are just too many variables.
I can say this, IPM does not mean it is a good machine and a good machine does not mean it has to be fast.
thanks your reply.
Because i testing my motor with vexta driver. It is 5-phase, 2,8A, It just run about 60RPM . I use 5mm ball screw it mean my cnc can run at 300mm/m, i think it slowly
Well 300mm/min is slow, but if you are using tiny cutters that may be too fast.
Do you have to use that drive ?
It is not uncommon for people to build machines that under perform because of the components that they have available, but also do build the machine so a upgrade at a later time is possible.
I use Super Vexta UDX5114 and UDX5128 driver. My own machine maybe is heavy machine . size is 800x650x300 mm . It use big ball screw. 40mm for x axis, 35mm for y axis and 25mm for z axis. All ball screw is used . product of NSK japan. Spindle use 3 phase AC motor, 2 HP. Use iventer for control spindle speed.
Nice size machine, have you started building or have you already built the structure ?
Why not post some pictures of it, every one on the CNCzone loves pictures, including me.
i just have planning. this parameter i give you because i had ball srcew. liner bearing. stepper motor and driver. Size of machine decide of size ball screw . that right?
Like Ken_Shea said, there's a lot more to it, really. Using a guess based on the pictures, I'd say repeatability and ridgidity would be much more important than "rapid speeds", which have long been a "salesman's game" really. Even for light work.
a simple job like drill, c-sink, and tapping 20 holes in a 1 in. x 1 in. pattern for instance. An old Acroloc with 400 in/min rapid speed would beat a more conventional 40-taper machine, even with 900 in/min rapid speeds for two reasons.
1. with a 1 in, distance from hole to hole, no machine ever gets to it's full speed. So...
2. The Acroloc's tool change time became the determiningfactor.
Next to consider, for the size machine you appear to want, time with "tool in the work" is more important, really. I'd put more weight on ridgity, and let heavier cuts make your money.
It's not just wear on ball screws that would concern to me either. If the work you have planned requires a good deal of rapid travel time, you're also going to have more expansion/contraction due to heat build up in a larger machine.
No matter how speedy a machine's rapid travel, a machine that has to take two cuts at twice the feed rate will lose to a machine that can do it in one pass, every time.
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