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Messages - kb18951452

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1
General Mach Discussion / Re: Motor Max Speed problem
« on: February 28, 2011, 09:45:01 PM »
So. It appears to have been the BOB. Replaced it.

We are having a diff problem now, however.

One side of the gantry seems to be running faster than the other.

I am wondering: We slaved the A to the X, and since then have adhjusted the steps per inch rate for the motors. Is there a chance that the steps per inch isnt getting properly applied to one of the motors? Maybe we need to unslave change the settings, then reslave the motors?

2
General Mach Discussion / Re: Motor Max Speed problem
« on: February 15, 2011, 01:42:03 AM »
I actually replaced the ICs on this board after i conencted 12v to the 5v terminal.....

Do you recommend a BOB? I'm familiar w/ cnc4pc, and would probably just get he updated version of this board.

3
General Mach Discussion / Re: Motor Max Speed problem
« on: February 14, 2011, 01:18:49 PM »
R&P and i don't know the pulley diameters (Only needed to know them when calculating things at the beginning.)

4
General Mach Discussion / Re: Motor Max Speed problem
« on: February 14, 2011, 12:52:28 PM »
that sounds about right.

5
General Mach Discussion / Re: Motor Max Speed problem
« on: February 14, 2011, 12:19:23 PM »
~1275 steps per inch. I don't know all the gearing details, but i do remember that the steps per is ~1275 (maybe 1272.24)

6
General Mach Discussion / Re: Motor Max Speed problem
« on: February 14, 2011, 11:43:17 AM »
Gotta get the XML file later, but we are using the cnc4pc C-11 with 4 Gecko 201x Drivers.

7
General Mach Discussion / Re: Motor Max Speed problem
« on: February 14, 2011, 11:11:29 AM »
Kernel speed set to 25.
We did some precise testing, and find that the "turning point" appears to be just above 500ipm Whats interesting is that this is about exactly half of the so called Max Velocity (According to Mach motor tuning). I know from experience that i almost never go over 200 (Not while machining, and the higher speed just helps with rapids. Any other Mach settings? Otherwise, seems my next stop is the BOB manufacturer.

8
General Mach Discussion / Re: Motor Max Speed problem
« on: February 10, 2011, 01:24:30 PM »
Hood, Thanks for the reply.

Where might i go to see/set the kernel speed? And secondly, what would be a reasonable speed, or how might i go about determining that?

9
General Mach Discussion / Re: Motor Max Speed problem
« on: February 10, 2011, 11:36:35 AM »
Where would i go to see what the kernel speed is set to? (I havn't changed it, don't even know how :), It might be the acceleration, but i changed that, And the problem was happening even when the motor was dismounted (900oz steppers).

Hood,
Yes, when Mach is showing a running speed of , say, 0-100, the motor will, Accelerate from 0-50, then decelerate from 50-100. I don't know the exact numbers, it seems we can get it to going 250 (as the computer reads) before going faster will cause it to decelerate. If youll let me know where to check those settings, or maybe i can load a file that shows all my settings

This machine is electronically identicle to another machine i have. Save the computer. This computer has much less RAM, that my other one.

Secondly, On my machine at home, when i drag the Velocity slider all the way over, it stops at 1184. I have thhis machine (the one with the problems) set at 1000IPM. Same number of Steps per in., mechanicals are identicle drive systems. Steppers are identicle.


10
General Mach Discussion / Motor Max Speed problem
« on: February 09, 2011, 03:11:35 PM »
So, i have a very weird problem. I can't figure out how to look for this on the forums, though i looked around best i could. Thought someone might have some ideas.

So, If i jog at a high speed, like 500ipm, this is what happens.

on the speed readout in mach:
From 0-250 ish, the motors accelerate
from 250-500 ish, the motors decelrate.

If i run at 400 ipm, it actually moves as a low speed.

I am sure i am losing steps. I get the idea that the kernel speed might be a factor, but i really don't know. Honestly, i cant even spell kernel :)

Has anyone seen this kind of thing before? Maybe i don't know to determine the max speed. , I honestly dont know. Would love to get back.

Thanks,

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