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27-03-2022 #11-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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28-03-2022 #12
This is the board I have.
Is the frequency the Kernal speed in ports and pins configuration?...if so it's 25,000hz
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28-03-2022 #13
Ok so you are using the parallel port now I'm not saying that is your problem, thou it's highly possible, but what I am suggesting is you do yourself a favor and buy an external motion controller like the AXBB-E which uses an Ethernet connection. Combine this with more volts for the steppers and you'll transform the machine into a different animal.
It will be more reliable and faster, you'll also be able to dump Mach3 and go with UCCNC software which is much better.
Now back to your issue.!
Because you are using the parallel port some of this could be because you have the machine overturned, So give us the settings you have for the motor tuning and the micro-steps set on the drives for each axis.
Also, have you checked the STEPS PER is correct by measuring it moves the correct distance told.?-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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28-03-2022 #14
Yeah that Ethernet board does look like a better job alright.
Here's pics of my my motor tuning and the motor controller jumpers.
Yup I have the steps per distance set correctly.
That in itself has been an issue, when I use the feature in Mach 3 settings to do this the actual cut dimension is different so I have to make a cut and measure that.
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28-03-2022 #15
Many moons ago I used that board and had missing step issues. I put it down to the speed of the opto isolators, but couldn't say for certain.I then used a board from CNC4YOU which was a lot better and worked ok in Mach3 and had 10v PWM for the VFD.
I finally got fed up with Mach3 and bought the AXBB and wouldn't go back. I can now run my toolpaths without babysitting the machine and hovering over the emergency stop button. Very confident with UCCNC.
Sent from my SM-A715F using Tapatalk
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28-03-2022 #16
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29-03-2022 #17
Just a point of sanity - that board has no opto-isolated outputs to drive the stepper driver (which will have) - the buffer devices - 74HC series has a rise/fall time measured in 10's of nano-seconds and current source/sink in the order of 35mA - that's NOT the problem here.
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29-03-2022 #18
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29-03-2022 #19
You guys have started to lose me with the Opto isolators chat, can you put it in layman's terms?
Also the relevance of the frequency?
I'm good at making stuff but electrical engineering and computers are not my strong point.
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29-03-2022 #20
Apologies. This particular thread of conversation started with questions around signal integrity (pulse widths, and the like). That lead into a general concern if the breakout board (bob) might suffer in its design with the use of slow opto-isolators - devices that act like electronic switches, that would couple the stepper pulse from the computer to the stepper drivers. It’s a weakness in design that crops up from time to time and exhibits the problems you have witnessed. My post was simply to identify that these devices are not present on your bob, for the stepper driver signals, and that we shouldn’t get distracted with talks of changing bobs on the basis of an invalid assumption.
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