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Messages - ger21

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861
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 04, 2017, 11:54:19 AM »
Do NOT buy a chinese motion controller, unless you want partial functionality, and no support.

Quote
I paid 1k for a basic Sherline stepper system so as far as cost goes in comparison, its rather insignificant considering the performance gain.

You can probably put together a stepper system for half that, that performs twice as well.


A $2K upgrade on a sherline that does little more than reducing noise is crazy, but that's just my opinion. ;)

862
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 04, 2017, 07:42:11 AM »
The biggest benefit the Clearpaths have, is that they are drop in replacements for steppers.
AC servos tend to be more powerful, and in many cases less expensive. But the frame sizes don't match steppers, so they are not quite as easy to implement on a stepper machine.

863
General Mach Discussion / Re: Motion controllers - Take me to school
« on: August 31, 2017, 06:37:01 AM »
Actually, AM882's typically run about $75 each on Ebay, and I've got them for as low as $58 each.
The downside is they are unsupported, as they are I believe intended to be sold to the chinese market only. But yes, they are comparable to Gecko G201's, and some would argue that they are better.

864
General Mach Discussion / Re: Motion controllers - Take me to school
« on: August 30, 2017, 05:30:54 PM »
Quote
the advantages of AC servos with my thinking is speed, not cut speed, but speed regarding approach, plunge, and transfer all with improved resolution.

You probably already have all the resolution your Sherline can handle.
And you can get plenty of speed out of steppers, with the right steppers, drives and power supply voltage.

Get some Leadshine AM882's from Ebay, and some low inductance, high current steppers, and you'll get all the speed  and power you need. And they'll run smoother, cooler and quieter than what you have.


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I also want to say more torque is not what I am after.

You can't get more speed without more torque. Generally, acceleration requires more torque than cutting does.
Quote
Another advantage is to use the external hardware drivers which I know steppers have as well but steppers are just noisy and don't like to be pushed very fast, at least open loop anyway. Using driver boards seems to be the way to go for more modern computer options.

You can't push a closed loop stepper any faster than an open loop stepper. When an open loop stepper runs out of torque, it stalls. When a closed loop stepper runs out of torque, the drive will fault. There's no magical power reserve to kick in when it loses position.

And I think you are confusing drives and motion controllers.

865
If your machine can handle it, higher acceleration is usually desirable.

866
General Mach Discussion / Re: Motion controllers - Take me to school
« on: August 29, 2017, 08:58:13 PM »
The stepper drives are separate from the motion controller.

Steppers are powered and controlled by the stepper drives, whether open or closed loop. The difference with closed loop is that the encoder signals go back to the drive.

Both types accept step and direction commands from Mach3, and as far as Mach3 is concerned, there is no difference.

Mach3 normally generates the step and direction pulses in software, and sends them out through the parallel port. For a variety of reasons, you can opt to use an external motion controller and not use the parallel port. In that case, Mach3 sends signals to the motion controller, and the motion controller generates and sends the step/direction pulses to the drives. Motion controllers can be either USB or ethernet, but ethernet is usually preferred.

867
You are running in CV mode, and Mach3 is rounding the corners in order to try and maintain constant velocity. The slower your acceleration, the more rounding you'll see. One thing you can do is go to General Config, and set Stop CV on Angles to 89, and enable it.

868
There's an option in Config Toolpath for 4th axis feedrate. Then, on the settings page, you need to enter the radius of your part. Then you should see proper feedrates.

869
8000 is degrees/min, which is about 22rpm.

870
Parallel port, not serial port.
Either get an older PC, or buy an ethernet smoothstepper, or UC400ETH motion controller. I wouldn't recommend a USB controller with plasma.

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