Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: jpeter on January 23, 2010, 09:16:18 PM

Title: speed mismatch
Post by: jpeter on January 23, 2010, 09:16:18 PM

On this new mach3 setup seems axis actual speed is only 75% of programmed speed. I must have parameter not properly set. For example, programmed f4 actually moves only at 3 inches/minute. What am I doing wrong?

Thanks,
Jim

Title: Re: speed mismatch
Post by: ger21 on January 23, 2010, 09:19:42 PM

Does the velocity DRO say 3ipm?

Title: Re: speed mismatch
Post by: jpeter on January 23, 2010, 10:14:49 PM

yes. example midi g1 x1 f10. result, fro 10, units/min 7.5

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 03:31:21 AM

You may have the FRO % set to 75%, make sure its at 100%
Hood

Title: Re: speed mismatch
Post by: jpeter on January 24, 2010, 09:16:04 AM

Regarding the FRO, I wish it was that simple.

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 09:18:42 AM

please attach your xml  and I will see if I can replicate.
Hood

Title: Re: speed mismatch
Post by: jpeter on January 24, 2010, 09:20:10 AM

I've been running mach since its inseption, back when mach 1 was king, so I pretty much know my way around around the major settings. The Mach 3 program I updated I've been running since maybe 2007.

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 09:23:51 AM

Quote from: jpeter on January 24, 2010, 09:20:10 AM

I've been running mach since its inseption, back when mach 1 was king, so I pretty much know my way around around the major settings. The Mach 3 program I updated I've been running since maybe 2007.

So what are you saying? If you dont want to attach your xml that is fine by me but if you are asking for help then I suggest it might be the quickest way to get this resolved.
Hood

Title: Re: speed mismatch
Post by: jpeter on January 24, 2010, 09:52:17 AM

Sorry, the timing of that last post was such that I was creating it during your request. I have to go to the shop for the xml file and its Sunday so it's gonna take me a while. Hey, thanks for the help. While I'm in the shop I'm gonna play with it a little more too.

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 09:57:16 AM

Ok no problem, stuff like that happens and I am doing my tax returns so I am a bit grumpy ;D

Hood

Title: Re: speed mismatch
Post by: jpeter on January 24, 2010, 10:11:43 AM

Got the solution. In the new setup I'd set the kernal speed at 35000. I just ran a test with it set back at the normal 25000 and the speed mismatch got fixed. Is it safe to assume my computer's not powerful enough for maxium performance. Its a pentium 3 666mhz. What would I gain, percent wise, by swapping the box for a faster one? Does the driver play a role. My driver is a 10 year old Camtronics servo driver. Its been a great dependable unit but never-the-less long in the tooth.

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 10:17:28 AM

It is your motor steps per unit and velocity that determines the Kernel you need. If you are fine at 25KHz then there is no need to move up to 35KHz as you will just waste resources and run into problems if your computer is low on them anyway. If you know your velocity could be higher but are restricted due to kernel speed then a computer upgrade may help or possibly use a SmoothStepper instead.
Hood

Title: Re: speed mismatch
Post by: jpeter on January 24, 2010, 10:27:29 AM

Lesson learned, stick with 25000.
Thanks Hood for the help/time. Good luck with the taxes. I've got that coming up too.

Title: Re: speed mismatch
Post by: Hood on January 24, 2010, 10:30:35 AM

No Problems :)
Oh and dont think luck will help, a silver cross, some garlic and a wooden stake are my only chance I think ;D
Hood