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Author Topic: mach 3 and Xylotex  (Read 5471 times)

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mach 3 and Xylotex
« on: February 17, 2008, 01:19:17 PM »
What kind of rpm can I expect to get from a xylotex system running 269 oz in motors using Mach3
Re: mach 3 and Xylotex
« Reply #1 on: February 17, 2008, 05:04:19 PM »
You can get a lot of RPM but it all depends on how much load you will accel and deccel and how fast.   What is your machine setup?
Re: mach 3 and Xylotex
« Reply #2 on: February 17, 2008, 07:44:28 PM »
I run it at 20 ipm with a 10 thread per inch lead screw anything faster seizes the motor. I thaught it might be my computer that’s keeping my speed down so low its only 1.1GHz. Someone else mentioned I might need to increase the voltage to the motors. My power supply is running 24 volts. I think I might be able to bump up to 32 volts with a different power supply. Im hoping that might speed it up.
Re: mach 3 and Xylotex
« Reply #3 on: February 17, 2008, 09:04:37 PM »
What microstep do you have it set to?   Going to 32v will for sure increase the speed.

Offline rcrabb

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Re: mach 3 and Xylotex
« Reply #4 on: February 17, 2008, 10:30:52 PM »
I run at 200ipm with my Xylotex. 5tpi ballscrews. 24 volt supply. I have dry run all the way up to 230ipm but there wasn't much torque. I usually cut at 150ipm to be safe.
« Last Edit: February 17, 2008, 10:35:04 PM by rcrabb »
Ryan
Re: mach 3 and Xylotex
« Reply #5 on: February 24, 2008, 10:05:55 AM »
     So I think I have this ipm thing figured out with out a load I can easily get 600 rpm out of my motors. The problem is because with higher rpm I have less torque. Since my x axis linear bearings are not the best it takes a lot of torque to drive them. My motors are stalling because they don’t have the needed torque at higher rpm. So I see I need to fix two things to get higher ipm with my machine. One upgrade my x axis (parts are on there way) and increase my voltage. Now I need to come up with a 30 volt power supply at 5a with out breaking the bank. If any reader knows of a good source for power supply like this please let me know.   
    Also I have a question about how torque falls off with higher rpm’s. For example if you go from 50 to 100 rpm is the torque decreased by half. Or is the fall off expediential. An increase from 50 to 100 rpm decreases torque by lets say three quarters.
   If toque does fall of expediential then replacing my 10 tpi lead screws with 5 tpi lead screw would increase my ipm speed with out halving my force at the cutting tool. Is this a correct assumption?



Dennis.
   I will figure out my microstep when I get back out to my shop. Does how microsteping is set up change the amount of torque with these motors?
Re: mach 3 and Xylotex
« Reply #6 on: February 24, 2008, 10:14:52 AM »
Dennis.
My microsteping is set at 1/8th.

Offline rcrabb

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Re: mach 3 and Xylotex
« Reply #7 on: February 24, 2008, 11:45:18 AM »
I got more torque by increasing the current. I was running at the recomended current for my motors, but I noticed after running for hours they never got warm. So a started increasing the current and got alot more torque. Now I have the Xylotex almost at its max current and my motors scream. They still only get warm after running for hours.
Ryan
Re: mach 3 and Xylotex
« Reply #8 on: February 26, 2008, 11:51:27 AM »
Now I need to come up with a 30 volt power supply at 5a with out breaking the bank. If any reader knows of a good source for power supply like this please let me know.

Meanwell S-150-27. This is 27 volts 5.6A nominal, adjustable 24-30V. At 30V it delivers 5.0A, so it's exactly what you're looking for. (Make sure that you get the -27 model. The much more common -24 model only goes up to 28 volts!)

$34.43 at trcelectronics.com. Jameco.com wants $69.79 for the same thing...

BTW, it is not recommended to run the Xylotex board with more than 30V. The limit is 35V, but you need a margin for back electro magnetic force. Quoting the Xylotex data sheet:
Quote
The system motor drive circuitry can handle up to 35 volts which includes Back EMF (BEMF). The recommended maximum running voltage is 30VDC. The absolute maximum voltage is 35VDC. Exceeding the maximum voltage (35V) will destroy the circuitry!

Peter
« Last Edit: February 26, 2008, 01:37:34 PM by pnielsen »