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Author Topic: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)  (Read 25041 times)

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Offline Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #20 on: March 30, 2011, 07:00:08 AM »
If that is the case then your encoders are 250CPR and thus 1000 pulses per rev.
Hood
Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #21 on: March 30, 2011, 07:15:12 AM »
I checked my Viper 100 Drivers:

The only thing to "electronic" gearing i found on the drive is the step multiplier.

The options are:
1. Programmable multiplier
2. 4x
3. 6x
4. 10x

I selected the first one, by not using any jumper on the pins. I thought this was suppose to be a 1x, but doesn't actually state if it is or isn't..

I bought all of them from U.S. Digital directly. They all came sealed in the bags and cases that read 1000CPR.

Even the product number i double checked on there website just now: E6-1000-250-I-D-E-D-B (1000cpr, .250 shaft, options I-D-E-D-B-)

Offline Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #22 on: March 30, 2011, 07:17:38 AM »
Sorry had calcs arse for tit, talking on phone and typing at the same time is not my strong point ;) , heres the new calcs with 1000 PPR

X Axis
1000 per motor rev
Gearbox is 10:1 so motor rotates 10 times for one output rev so that is 10,000 steps per output rev
3191.931756 steps are needed to move 1 inch so 10,000/3191.931756 = 3.13289inch per rev that the axis moves per rev so divide by Pi and you have the dia which is 0.9977 inch.

Y Axis
Same encoder same gearbox so
1,000 steps per output rev
2491.704346 steps are needed to move 1 inch so 10,000/2491.704346 = 4.0133 inch per rev, divide by Pi and you get 1.278 inch

Z Axis

Same encoder so still 1000 per rev of motor, no gearing so again 1000 per rev of screw. 10,040.73425 per inch so 1000/10,040.73425 =0.0996 pitch screw

So looks like the Z at least is out as I presume you used the auto calc and your measuring was a bit out.
Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #23 on: March 30, 2011, 07:19:01 AM »
Not sure how US Digital marks their encoders, maybe the 1000 is pulses per rev rather than the line count?
Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #24 on: March 30, 2011, 07:20:00 AM »
Actually hang fire on my calcs, I will think about this before I type, its always a good idea to do that, just I often dont  ;)
Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #25 on: March 30, 2011, 07:28:14 AM »
Ok so start with Z, to calc properly we know 1000 pulses per rev of encoder so 1 rev rotates your screw 0.1inch as we know its 0.1 pitch so steps needed to move 1 inch  by calculating would be 10 times 1000 = 10,000
You have 10,040.73425  so divide by 1000 and that would mean 10.04073425 turns per inch so divide 1 inch by that and you get the pitch working out at 0.09959 which is close. Best using the calculated value though unless your screw is not precision.
Hood
Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #26 on: March 30, 2011, 07:33:22 AM »
Your new calcs look dead on. The Z pitch is .1" for sure. I'm 99% sure the X axis is 1" (i bought it new from mcmaster, just lost the paper work but swear its 1")  and the Y axis seems to be 1.25" last time i tried to get a caliper in where its housed.

The US digital site has now confused me further. In one sentence they say " we offer 256 to 10,000 pulses per revoultion (PPR) ". But on the drop down menu when you actually select the count it clearly states 1000 CPR. The ones i have are 1000CPR, what the heck is the difference between CPR and PPR.

http://usdigital.com/products/encoders/incremental/rotary/kit/e6

http://usdigital.com/assets/general/90_e6_datasheet_1.pdf

Offline Hood

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #27 on: March 30, 2011, 07:36:51 AM »
So X we start on now ::)
1000 pulses  per motor rev
Gearbox is 10:1 so motor rotates 10 times for one output rev so that is 10,000 steps per output rev
3191.931756 steps are needed to move 1 inch so 10,000/3191.931756 = 3.1329inch per rev that the axis moves per rev so divide by Pi and you have the dia which is 0.9977 inchr.

Hood
« Last Edit: March 30, 2011, 07:40:50 AM by Hood »
Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #28 on: March 30, 2011, 07:38:57 AM »
It is possible my leadscrew is not perfect, or it could be that my dial indicator is not perfect either. I will use the auto calculator either way. I need a better dial indicator!! Mine reads .0005" but its a cheap digital 0-1" one from harbor freight ($35USD). It seemed to work well but i would feel better with an expensive indicator.

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Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)
« Reply #29 on: March 30, 2011, 07:40:17 AM »
Now Y

1000 pulses  per motor rev
Gearbox is 10:1 so motor rotates 10 times for one output rev so that is 10,000 steps per output rev
2492.704346 steps are needed to move 1 inch so 10,000/2492.704346 = 4.0133inch per rev that the axis moves per rev so divide by Pi and you have the dia which is 1.278 inch