Messages

851

General Mach Discussion / Re: Speed up my cnc machine

« on: September 12, 2017, 08:23:13 PM »

Those motors should get you more speed with 5 start screws, but to get the most performance from those motors, they need better drives and 72 volts.

852

General Mach Discussion / Re: Mach3 always hesitates in arcs and circles

« on: September 12, 2017, 09:34:12 AM »

And are you in CV mode?

You should be in CV mode, with ALL CV options turned off, except  "Stop CV on angles". Turn off all CV options in General Config, and CV Distance and CV Feedrate on the Settings page.

Make sure you are seeing G64 in the status line when the code is running.

853

General Mach Discussion / Re: Speed up my cnc machine

« on: September 11, 2017, 09:47:59 AM »

What motors, drives, and screws are you currently using?
It's possible that3 /- 5 start screws will be much faster. But if your other components aren't up to the task, they may not work well.

854

General Mach Discussion / Re: Motion controllers - Take me to school

« on: September 11, 2017, 08:54:34 AM »

I've found that my motors running on an AM882 drive at 1/16 microstepping are pretty quiet, when they are not spinning at full speed.

855

General Mach Discussion / Re: UC100 Question part 2

« on: September 11, 2017, 08:52:02 AM »

The UC100 is not an adapter, it's a USB motion controller. The parallel port on it is to make it easy to connect to breakout boards and stepper drives with parallel port connections.

856

General Mach Discussion / Re: UC100 question

« on: September 11, 2017, 08:49:20 AM »

A UC100 should cost roughly $125. If it's a lot cheaper, it's a chinese knockoff, and not a real UC100.

If you are in the US, but from CNC4PC, or Automation Technologies. In other parts of the world, buy from CNC Drive directly.

857

General Mach Discussion / Re: Motion controllers - Take me to school

« on: September 07, 2017, 04:47:50 PM »

I would think that a 400w servo is overkill for his machine, even direct drive. Remember, peak torque is near 500oz. And I think those machines have 20tpi screws, so you have a large mechanical advantage.

858

General Mach Discussion / Re: Motion controllers - Take me to school

« on: September 07, 2017, 04:12:44 PM »

I have a new 400w servo at home. It's slightly larger than a 570oz nema 23 motor. And probably 10x more powerful, if used properly. The servo has 160oz continuos torque at up to 3000 rpm, and  still about 100oz in at over 4000 rpm.
The 570oz stepper is down to about 160oz of torque at about 800-1000 rpm. If you use a 4:1 gear reduction, the servo has 4x the torque of the stepper. But the servo's peak torque rating is almost 3x higher, so when acceleration up to speed, you then have over 10x the torque of the stepper, in a similar size package.

859

General Mach Discussion / Re: Motion controllers - Take me to school

« on: September 06, 2017, 10:06:12 PM »

were as the ac servo would constantly try to turn the shaft with 90oz in of force even if the motor is fully stalled.

No, the drive will fault once it gets a certain amount out of position.

860

General Mach Discussion / Re: Motion controllers - Take me to school

« on: September 04, 2017, 09:53:33 PM »

http://www.cncdrive.com/ have useful product, the simple and cheap UC100 is Mach4 capable, the larger and more functional products are Mach3 capable only

They now also have a Mach4 plug for the UC300ETH. The UC400ETH plugin will probably follow.