Author Topic: Milldred gets some  (Read 849 times)

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Offline Chris.Botha

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Milldred gets some
« on: September 01, 2018, 07:04:37 PM »
Bought a 5 axis minitech, been getting her up and running in my spare time.

first cur from her yesterday, 60mm across diameter, 8 hours cut.. pathed with deskproto and even at 1200mm/min i was seeing sustained 150mm actual..
going to try recut using my RhinoCam copy and arcfit the path, see if i can sustain a higher feedrate.


Offline ger21

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Re: Milldred gets some
« Reply #1 on: September 01, 2018, 07:42:44 PM »
Good to see you back, Chris.
Been a long time.
Gerry

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Offline Chris.Botha

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Re: Milldred gets some
« Reply #2 on: September 01, 2018, 09:37:08 PM »
thanks, yeap, was in Thailand for a few years doing a thing or two, back in Australia now.

Offline garyhlucas

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Re: Milldred gets some
« Reply #3 on: September 03, 2018, 01:20:36 PM »
The thing slowing you down is acceleration. With a trapezoidal move profile you simply don't get to speed on a short move. Depending on where you are currently a higher voltage power supply, if the drives can handle it may help a lot.  The next step would be bigger motors and or drives.  If you go new motors get low inductance ones as that makes a big difference too.

My machine moves at 7600 mm/min rapids with 68vdc power supply and large nema 34 steppers. It gets up to speed scary fast!  Big CNC machines can do huge accelerations which is what actually reduces the cutting time.

Offline Tweakie.CNC

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Re: Milldred gets some
« Reply #4 on: September 04, 2018, 01:33:32 AM »
Excellent work Chris.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline Chris.Botha

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Re: Milldred gets some
« Reply #5 on: September 04, 2018, 04:00:11 AM »
Thanks, the casts came up ok.


Offline Chris.Botha

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Re: Milldred gets some
« Reply #6 on: October 26, 2018, 06:28:48 PM »
Some help from you smart types... I had this same config a few years back, and it was silky smooth, but when i run code now its jerky..

the path that is running is doing a series of XYZA, followed by a B, then repeat.

If I manually jog the machine pressing XYZAB its fast and smooth even at 1200mm rapid.

Mach3
UC300 motion controller @ 100khz
Mach set to 100KHZ
Look Ahead on 1000 or even 2000 makes no difference.
Constant velocity is set on.

any tips?

https://www.youtube.com/watch?v=5W9KAiYdED0

Offline Chris.Botha

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Re: Milldred gets some
« Reply #7 on: October 26, 2018, 09:03:01 PM »
(i changed CV stop angle to 180 which dramatically improved things, can achieve 2000mm/min smoothly, what does changing that achieve? does it reduce accuracy somehow?