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Author Topic: Travel speed  (Read 11504 times)

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Offline Hood

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Re: Travel speed
« Reply #40 on: September 08, 2010, 06:00:08 PM »
You are using metric though, aren't you?

Getting the acceleration as high as you can without faulting will make a big difference, that is where servos really score over steppers.
Hood
Re: Travel speed
« Reply #41 on: September 08, 2010, 06:04:43 PM »
Hood
Yes i am in metric G21 should i make a change to the acceleration as well i have only made the change to the velocity.

Dennis

Offline Hood

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Re: Travel speed
« Reply #42 on: September 08, 2010, 06:09:19 PM »
Try upping the accel and get it as high as you can. What kind of servos and drives do you have?

Hood
Re: Travel speed
« Reply #43 on: September 08, 2010, 06:36:38 PM »
Hood
The machine has big mho servo drives and i am using gecko 320 drives on all axis 500 line hp encoders.

Dennis
Re: Travel speed
« Reply #44 on: September 08, 2010, 06:39:27 PM »
Hood
one more thing i am really excited in 1hr 20 min the machine has now gone through over 3600 lines of code until i made the present changes it took the machine more then a day's time to process the same amount wow what a change thanks again.

Dennis 

Offline Hood

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Re: Travel speed
« Reply #45 on: September 09, 2010, 02:14:52 AM »
Glad to hear its working better for you :)
Hood
Re: Travel speed
« Reply #46 on: September 09, 2010, 12:57:55 PM »
Hood
I know the machine's drives are way under power for the servos as the original ones were 100 V at the time i was retrofitting the machine these are what the budget could handle.
One thing i did notice is when changing the kernel speed from 3500 to 2500 it seamed that the machine travel was faster so fast that the drives would fault out and a mach statement came up saying the speeds that were set for the drives was to fast what is the relation of kernel speed to drive speed or how dose this work?

Dennis

Offline Hood

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Re: Travel speed
« Reply #47 on: September 09, 2010, 02:12:58 PM »
The reason you would have seen that was you had previously set the velocity higher with the higher kernel then when you dropped the kernel the velocity was above what that kernel could deliver.
The way it works is this
25KHz kernel means that you can pulse at a max of 25,000 times per second, if your steps per unit are say 1,000 then that means your velocity can be 25,000/1,000 = 25 units. BUT that is per second so you would multiply by 60 as the Velocity you enter is per minute, so that would be a max velocity (at the steps per unit of this example) of 1500 units per minute.

Using the same Steps per unit but 35KHz kernel it would be 35,000/1000 x 60 = 2100 units per minute
For 45KHz its 45,000/1000 x 60 = 2,700 units per minute
Etc etc

Hood
Re: Travel speed
« Reply #48 on: September 10, 2010, 12:29:32 PM »
Hood
Thanks that explains it very well and i will apply this to the machine sure dose run a lot better now thanks again.

Dennis

Offline Hood

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Re: Travel speed
« Reply #49 on: September 10, 2010, 01:33:26 PM »
No probs Dennis, glad its running well :)
Hood