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Missing steps in jog follow mode

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rcrabb:
I was running with the pod tonight. Everything was going great untill I put mach in jog follow mode. I was running a 3d four axis file. I put Mach in jog follow mode and started missing steps. Took it out of follow mode and everything was ok. I did this test several times. Every time with same results. Maybe you guys know of the bug, I'm just reporting what I find.

kookaburra:
Ryan,

Thanks for letting us know, I will report the issue as it is not one I have come across before.

Dave

rcrabb:
Today I upgraded Mach3 and the NCpod plug-in. For the servo time I use .00084. I have been testing the pod as hard as I can. It seems the missing steps are not just related to jog follow mode but with any extra work the graphics on the screen do. If I rotate the graphic of the toolpath I get missing steps or if I move around screens allot.

Now I also find the FRO not working correctly. I move the slider and nothing changes. Sometimes it works.

Sometimes while running at 200ipm I do a feedhold when I restart the feedrate is much lower than 200ipm, maybe 50ipm. If I feedhold again and restart the feedrate goes back to 200ipm.

200ipm on my machine is near the limit of my steppers. I like to test at this speed because Ill get missing steps very easy if the pod doesn't keep the motion perfect. I do all these same tests using the printer port so I'm sure the information is pod related and not lack of torque, noise or any other strange variable. With that said, I found another thing. While running the roadrunner I would do a feedhold and restart, maybe 20 times. After the 20 feedholds I measured my axis and found I had lost position about 1/4 inch. I believe it was missing steps because I could here the missed steps everytime I did a feedhold.

Last thing for today. Everytime I start the pod I have to load the firmware. I get the slow blinking amber led. I load the firmware and the led stays steady. Is this the same for everyone?

My wife thinks its strange that I am happier when things don't work perfect.  ???

Chaoticone:
Men. ;D

kookaburra:
Ryan,

You mean you are a hobby CNCist and you have a wife?  ???

Be Sure you have not accidently knock out your SD Card as this happened to me once and although the SD Card was in the housing, it was not all the way home  :o . Other than that mine works all the time every time.

I am running a servo system and the machines movements a 100% accurate so the Pod ad Mach3 are not actually losing the steps, rather I think your motors are skipping steps, this could be due to the fact that at the moment Mach3 and the Pod are not running stepper motors as well as Art would like to see them run  :'( . I know Art is working on that side of things.

Dave

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