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Author Topic: new to mach - what can i expect?  (Read 7653 times)

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farmertwingolf

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Re: new to mach - what can i expect?
« Reply #10 on: August 20, 2011, 06:01:58 PM »
Is there numbers on the servos that show what the steps per unit and velocity are for them?

Offline Hood

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Re: new to mach - what can i expect?
« Reply #11 on: August 20, 2011, 06:34:07 PM »
To work out steps per unit you meed to know the line count of the encoder, the pitch of the screws and any gearing that you have between motor and screw. If you let me know that I will show you how to work out steps per unit, oh also say whether its metric or imperial units you will be using as default units.

Velocity will depend on the motor and also possibly the voltage your drive is supplied with, for example servos will have a velocity constant, in other words X amount of volts per 1000RPM. The motors will also have a max continuous RPM rating. If you give details about the motors and the supply voltage to the drives I can give you a ballpark figure.

Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #12 on: August 20, 2011, 08:07:50 PM »
Servos have 142 volts, 30 pulse amps, and tacho 9.5 volts/1000 rpms on the label. I will figure out the thread pitch and gearing online.   The encoders were in the set I bought from someone who was using emc2 and had extras but I will figure out the line count.

Offline Hood

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Re: new to mach - what can i expect?
« Reply #13 on: August 20, 2011, 08:27:58 PM »
Ok Tacho has no relevance as you will not be using it, they were used with the analogue style amplifiers (drives)

What voltage will your supply to the Dugongs be?


Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #14 on: August 20, 2011, 08:58:39 PM »
should be close to 160v

Offline Hood

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Re: new to mach - what can i expect?
« Reply #15 on: August 20, 2011, 09:07:06 PM »
Might want to lower that a bit as your motors are rated at 142v so would have to be careful you didnt set the velocity too high or your motors would get over their rated voltage. Likely wouldnt harm too much if it was just for short periods but still something to think about.
Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #16 on: August 20, 2011, 09:12:06 PM »
i will check with the electrician.  i have a relative that helps with electrical issues since its my weakest point.    ;D

Offline Hood

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Re: new to mach - what can i expect?
« Reply #17 on: August 20, 2011, 09:13:36 PM »
;D

Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #18 on: August 20, 2011, 09:42:34 PM »
i was a little off, its 118 volts.  hypothetically, if i am unable to gather all of the other info, will i be able to tune them correctly? or will it just take a lot longer.

Offline Hood

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Re: new to mach - what can i expect?
« Reply #19 on: August 20, 2011, 09:53:27 PM »
Really need to know what the rated RPM of the motor is  or the voltage/rpm constant to work out the max RPM you will get at that voltage.

You need the encoder counts, the pitch and the gearing if any to calculate the steps per unit, you could use Mach to calculate it buit that is only ever as good as your measuring and is personally not the preferred method for me.

Hood