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Travel speed
« on: September 06, 2010, 04:11:52 PM »
Hi Guy's
 Trying to get some more speed in the X&Y travel  I am using servo motor's and gecko drives i have tried upping the kernel speed to 4500 but when the machine dose a rapid it faults out the drives is the speed and the computer CPU speed connected do need a faster computer to get more speed out of the machine or is there something else i am over looking.
Thanks
Dennis

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Re: Travel speed
« Reply #1 on: September 06, 2010, 04:16:57 PM »
Do the Geckos give you an error for fault finding. Sounds to me like you are getting a following error due to the increased speed and the drives not being able to keep within the following error range. Other thing could be overcurrent as the motor is drawing too much trying to accelerate to the speed.
Try dropping the acceleration and see if that helps, also maybe a bit of tuning is required, not sure how easy or difficult that is with Geckos.

Hood
Re: Travel speed
« Reply #2 on: September 06, 2010, 04:25:54 PM »
Hi Hood
Thanks for the quick reply, the machine operates very well and no problem with the processing of G-code but i want the machine to go faster if i increase the kernel speed in Mach the machine moves faster but then when it calls for a rapid move the machine studder's and the drives fault out.

Dennis 

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Re: Travel speed
« Reply #3 on: September 06, 2010, 04:30:26 PM »
What does the Pulse Frequency on Diagnostics page read and does it jump about a lot or is it steady?
Hood
Re: Travel speed
« Reply #4 on: September 06, 2010, 04:35:43 PM »
hood
It's very steady around 3500.

Dennis

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Re: Travel speed
« Reply #5 on: September 06, 2010, 04:38:04 PM »
Too low if you have the Kernel set to 45K, it should be around about the 45K. You did restart Mach after the kernel change I presume?
Hood
Re: Travel speed
« Reply #6 on: September 06, 2010, 04:43:29 PM »
Hood
I had to change the kernel speed back to a lower speed of 3500 because of what i said above it would fault out the drives at the higher 4500 kernel speed so i set it to the lower 35 and no problem the machine runs fine just slow i have mach over driven to 300 % it's still moving slowly i timed it the machine travel is about 85 MM in 20 seconds i don't know but it seams slow to me.

Dennis

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Re: Travel speed
« Reply #7 on: September 06, 2010, 04:46:08 PM »
What steps per unit do you have?
What do you mean by over driven 300%

Hood
Re: Travel speed
« Reply #8 on: September 06, 2010, 04:50:50 PM »
Hood
The machine is at 790 steps per unit and what i mean is on the mach screen there is a setting to increase the feed rate i have it at 300 right now.

Dennis

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Re: Travel speed
« Reply #9 on: September 06, 2010, 04:59:04 PM »
Ah Ok FRO will only increase the feedrate (G1/G2 etc) G0 moves will always be the max set in motor tuning and also feed moves will never exceed that as well even if FRO is up to 300%.

The max rapids you will get with that kernel and that steps per unit are 2658 mm/min or 44 mm/sec

So your 80mm in 20 secs is very slow indeed. How are you commanding the move? If you G0X100 it should move at the velocity you have set in motor tuning.
Hood