Messages

91

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« 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

92

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« 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-)

93

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 06:59:49 AM »

I will have to go check to see if i have the pins set for electronic gearing. I'm fairly certain i do not. be back in a moment.

94

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 06:58:41 AM »

Seems like if you divide 1000CPR/10,040.73425 you get .0995943, or roughly .100 leadscrew pitch which it was advertised as. My mind is fried haha.

95

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 06:54:24 AM »

Well i know my output gear for the x and y are somewhere around 1" i will have to measure them somehow. Really hard to get a caliper in where they are.

The z axis screw is a .1 pitch kirk leadscrew, its brand new.

96

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 06:14:45 AM »

Is there a way to calculate the gear ratio if i know my exact steps per inch?? I went out to measure the gear but cant really get to it, and even so i can't measure the Diametral Pitch, which is obviously less than the overall diameter which i estimated. With the following below is there anyone i can reverse calculate the gear pitch?

X axis: 3191.931756 steps per inch @ 700IPM (10:1 gear reduction) (1000CPR encoder)
Y axis: 2491.704346 steps per inch @ 499.98IPM (10:1 gear reduction) (1000CPR encoder)
Z axis: 10,040.73425 steps per inch @ 49.998IPM (No gear reduction directly linked to lead screw) (1000CPR Encoder)

97

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 05:32:51 AM »

I have a 10:1 gear reduction on each servo. So would it be 1875RPM/10=187.5 RPM x3.14 = 588ipm max?

98

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 05:08:01 AM »

That is really odd. I have been running my X axis @ 800IPM, and Y axis @ 500IPM @ only 125Khz on the smooth stepper. My viper drivers only accept a maximum of of 125Khz input. I was told by viper to make sure that i don't exceed that number so i set it @ 125khz and left it. I believe the smooth stepper was set to 1Khz or 512mhz speed, and each axis was set to specifically 125Khz. How would you explain that? Thank you by the way for your time, it means a lot Hood!

99

G-Code, CAD, and CAM discussions / Re: Solidworks, to solidcam, to mach 3.

« on: March 30, 2011, 03:41:22 AM »

I have axis to Mastercam X5. I will have to try it out. I'm looking for something user friendly.

100

General Mach Discussion / Re: Mach 3 Driver test. Results for 3 computers, which is best? (PICS)

« on: March 30, 2011, 03:37:24 AM »

I am re-doing my Bridgeport at the moment and normally I use a Via Pico mobos (tiny things   ) but as I am needing dual Lan this build I decided to go with an Asus micro ATX with a 1600 Atom. Although I wont be using the parallel port I ran the driver test and was amazed at how good it was even at the 100KHz. I scoped the output and it was also quite nice but not as clean as the SS is at that or faster. I think however it would run fine at 100K from the PP if I was to go that route but I need almost 500KHz on this setup so it wont happen
Hood

I tried to follow along to see how many Khz i would need to find a theoretical max speed in the mach manual but the wording is very confusing and frankly the example they use SUCKS. Anyone wanna give me a run down? I have 3200rpm servos with a 10:1 gear reduction on them followed by roughly a 1" output spur gear on a rack. I have 1000CPR US digital E6 encoders mounted on my servos. anyone have the equation?

Technically 3200rpm/10= 320rpm output MAX.
circufrence of 1" output gear is equal to pie (3.14). Take the 320rpm x 3.14 = 1004.8 inches per minute. This is my physical max limit.

Now with 1000CPR encoders with differential output, @ 1000 IPM what would i need for Khz?

Thanks!