My didn't want to go past 2000mm/min.

diycnc-machines
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(Marcus Wolschon) #1

My #TravelCNC didn’t want to go past 2000mm/min.
Just updated #MACH3 kernel speed to 100KHz and set the motor max speed to 4000mm/min (not touching the acceleration).
The Xulifeng controller card can do 200KHz and the stepper drivers are running at a fraction of their rated load anyway.
Z axis is a bit choppy now at 3000mmm/s doing wood with Z-0.5mm .

(Marcus Wolschon) #2

3900mm/min now.
The Z axis is the only axis that uses one of the old stepper drivers.
So I guess it will stop being choppy with one of the 5A drivers, when the voltage is no longer above it’s absolute maximum rating. :wink:

(John Bump) #3

That’s cooking. Mine’s limited to about 1500mm/min thus far.

(Marcus Wolschon) #4

At these speeds I noticed that acceleration is the limiting factor.

…and tollerable audio levels. :wink:

(Mark McKinlay) #5

Surprised that isn’t loud as hell.

(Marcus Wolschon) #6

Normally it’s not louder then a sewing machine.

(Marcus Wolschon) #7

I guess with a better stepper driver for Z I can go a long way by using parallel strategies for roughing and thus removing the need to change direction as much.
Currently I’m using waterlines to keep Z movement to a minimum.

(X,Y,A drivers have been replaced after 2 of them burned up. Z still has the original driver. Thus I’m limiting the load I put on it until the replacement arives.)

(Marcus Wolschon) #8

Actually the cutting speeds and depth are determined by noise level and neighbors. :wink:

(Marcus Wolschon) #9

Aparently noise is determines primarily by RPM, secondary by cutting depth.
So shallow cuts with higher speeds are more tollerable.
#TravelCNC sits on a rubber mat inside a fligth case with Basotect Acoustic foam lining the walls. …and uses a spindle that is hardly any louder then a sewing machine.

…my large CNC on the other hand is another matter.