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Author Topic: new to mach - what can i expect?  (Read 7581 times)

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farmertwingolf

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Re: new to mach - what can i expect?
« Reply #20 on: August 22, 2011, 12:22:02 PM »
I sent an email to the guy I bought my hardware from.  This is the reply, hopefully it has all the info needed for software configuration.   "
The encoders are 500 line which will give 2000 counts per revolution in quadrature. The encoders are 5V single ended.  The differential converters are also 5V.

Your thread pitch is .200 on X and Y.  I cannot remember the Z axis pitch.  You should verify Z with a dial indicator as I am working from a defective memory.

The actual counts per inch will depend on whether you have the encoders on the motors or the ballscrews.  Your belt reduction is probably 2:1 on all axis'."

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #21 on: August 22, 2011, 03:54:47 PM »
The pitch on the Z axis is 1.8 to 1

Offline Hood

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Re: new to mach - what can i expect?
« Reply #22 on: August 22, 2011, 04:49:47 PM »
The steps per unit for X and Y will be 20,000

The way that is worked out is 2000 steps to move the motor 1 rev, you have 2:1 gearing so that means 2 motor revs to one screw rev so to turn the screw once it will need 2000 x 2 = 4000

Your pitch of screw is 0.2inch so it will take 5 turns to move 1 inch so steps per inch are 4,000 x 5 = 20,000 steps per inch.


Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #23 on: August 22, 2011, 04:54:47 PM »
So 18000 steps per unit in Z?

Offline Hood

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Re: new to mach - what can i expect?
« Reply #24 on: August 22, 2011, 04:56:43 PM »
If the screw is the same pitch as X and Y then  yes.
Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #25 on: August 22, 2011, 05:06:19 PM »
Pitch in Z is 1.8 to 1 but same encoder line count

Offline Hood

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Re: new to mach - what can i expect?
« Reply #26 on: August 22, 2011, 05:11:45 PM »
That is the gearing, the pitch is the distance between each "thread" on the screw. Your X and Y are 0.200pitch which means there are 5 to 1 inch so in other words the screw has to turn 5 times to move the axis one inch.
Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #27 on: August 22, 2011, 05:13:36 PM »
Oh ok.  So I will enter 20000 steps per unit for x and y and 18000 for z?

Offline Hood

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Re: new to mach - what can i expect?
« Reply #28 on: August 22, 2011, 05:16:37 PM »
Yes, if the pitch of the Z is 0.200". The guy said he couldnt remember what it was according to your post above.
If you try 18,000 and command a 1 inch move via MDI then you will be able to see if it moves 1 inch or more or less.
Hood

farmertwingolf

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Re: new to mach - what can i expect?
« Reply #29 on: August 22, 2011, 05:22:10 PM »
Thanks a ton hood. Someone from anilam sent me the 1.8 to 1 ratio.  What else will I need to know for software config?