**RESOLVED** How many, is to many encoder counts?

[Bill]

Hi all, my cnc runs great! just a couple of questions:

1) I have "go fasty" brush less motors with 2,500 line encoders, 10,000 counts per REV with 7.5 motor turns per inch. It runs great at rapid traverse 250 IPM. I can go 400 IPM if i want. My question is: thats a lot of encoder counts being sent to MPU11. If i go 400 IPM's will that many counts be to much for MPU to handle, or is it ok? ( Accurate positioning is very important to me. I can scale down the encoder counts being sent out of the drive, if that’s to many)

2) The Centroid/Ajax software is nice, and that’s what we are going to use. I do have the Mach3 software, so just for fun, can i try Mach software in my system, or is there a hardware difference in your circuit boards? ( i am very familiar with the Mach3 software, and i don't feel it is a good software for our hardcore machine shop environment. I have more than 20 cnc mills )

Thanks,
Bill
BTW, I have sn#A900168 , MPU11, GPIO4D, windows software ver CNC11, and Ajax/Centroid operating software

[Centroid_Tech]

Bill,

The MPU11 can handle 25000000 counts/sec.

You will not have a problem if you increase your max rate to 400ipm.

All Mill Ajax systems have the ability to run Mach3 or Centroid software, there are no differences in the hardware.

[CNC-Global]

Mpu11 handle
Encoder input frequency (per channel)* Max 6000 khz i.e 6Mhz according to the Mpu11 manual
.As long as your max rate is under this frequency then no problem .

As you mention

1turn = 10000 encoder counts
7.5 turns =75000 counts
75000 encoder counts = 1inch
now on 250IPM your frequency is
75000 x 250 counts /min =250 in/min
18750000 counts/min =250 in/min
In sec
312500 sounts/sec =4.167 in/sec
0.3125 Mhz or 312.5 Khz frequency on 250 in/min
upon 400ipm your Frequency is 500Khz or .5 Mhz
So you can easily increase the Max rate .

Yes you can try mach3 on Gp4iod


CNC Global