New to LinuxCNC - seek ATC advice
10 Aug 2015 21:46 - 15 Aug 2015 08:18 #61278
by ftree
Replied by ftree on topic New to LinuxCNC - seek ATC advice
Interesting! 
Last edit: 15 Aug 2015 08:18 by ftree.
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12 Aug 2015 08:50 - 12 Aug 2015 16:30 #61304
by ftree
Replied by ftree on topic New to LinuxCNC - seek ATC advice
Quick question regarding the Mesa FPGA cards. I can't really find a clear FAQ anywhere.
With a low latency PC what frequency can I expect to drive stepper motors? I was looking at the 7i76E from a touch screen AMD APU CPU.
I assume the software step limitations are removed with FPGA adaptors?
With a low latency PC what frequency can I expect to drive stepper motors? I was looking at the 7i76E from a touch screen AMD APU CPU.
I assume the software step limitations are removed with FPGA adaptors?
Last edit: 12 Aug 2015 16:30 by ftree.
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12 Aug 2015 16:55 #61320
by andypugh
I think the limit is something like 10MHz. Basically so fast that you don't even have to consider it.
Replied by andypugh on topic New to LinuxCNC - seek ATC advice
With a low latency PC what frequency can I expect to drive stepper motors?
I think the limit is something like 10MHz. Basically so fast that you don't even have to consider it.
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12 Aug 2015 18:03 - 12 Aug 2015 18:04 #61321
by ftree
Replied by ftree on topic New to LinuxCNC - seek ATC advice
Excellent. I only need ~ 250Khz max. My stepper has 6400 steps per rev with 8mm lead screws. So 2000 rpm = 16m/min rapids @ 214Khz.
Last edit: 12 Aug 2015 18:04 by ftree.
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15 Aug 2015 08:42 - 15 Aug 2015 08:58 #61408
by ftree
Replied by ftree on topic New to LinuxCNC - seek ATC advice
Andy,
I've had a quote back for MicroE Systems Mercury II.
The SPI or Quadrature sensors are around £750+VAT on a 5m cable. 3m of tape with end limits is around £400+VAT. The end limits laser etched on the tape are useful.
The Quadrature version has some useful pins like tri state alarm and active-low non latching for the limit markers. At 40nm interpolation and a max speed of ~20m/min we would require a output frequency of around 2MHz.
The resolution for the SPI version @ 25Mhz does not drop off with speed.
Pricey. Does anyone know how that compares to Renishaw Resolut?
I've had a quote back for MicroE Systems Mercury II.
The SPI or Quadrature sensors are around £750+VAT on a 5m cable. 3m of tape with end limits is around £400+VAT. The end limits laser etched on the tape are useful.
The Quadrature version has some useful pins like tri state alarm and active-low non latching for the limit markers. At 40nm interpolation and a max speed of ~20m/min we would require a output frequency of around 2MHz.
The resolution for the SPI version @ 25Mhz does not drop off with speed.
Pricey. Does anyone know how that compares to Renishaw Resolut?
Last edit: 15 Aug 2015 08:58 by ftree.
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15 Aug 2015 17:00 #61409
by andypugh
You could look at magnetic tape scales:
www.machine-dro.co.uk/digital-readout-sy...30&encoder_type=1101
That works out at about £170 for the tape and £70 to £170 for the reading head depending on accuracy.
I think that most machines choose to trust the ballscrews.
Replied by andypugh on topic New to LinuxCNC - seek ATC advice
Pricey. Does anyone know how that compares to Renishaw Resolut?
You could look at magnetic tape scales:
www.machine-dro.co.uk/digital-readout-sy...30&encoder_type=1101
That works out at about £170 for the tape and £70 to £170 for the reading head depending on accuracy.
I think that most machines choose to trust the ballscrews.
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22 Mar 2016 10:22 #72007
by tkamsker
Replied by tkamsker on topic New to LinuxCNC - seek ATC advice
hi ftree did you solve yours i just saw you mentioned my video 
-
thomas
-thomas
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