Power supplies for UHU

[cnc2]

Hi Guys !

I did the test at 45KHz & 75 KHz, every thing was smooth, what i can say now is: IT IS A COMPUTER PROBLEM. Thanks Henrik ! you were right about this one.

look at the vid 75khz, when i click to expand the task manager's window the motor locks & it also locks when i minimize it.

At 75khz & analyse mode on the motor runs smoothly when the terminal window is minimized, but when it's expanded the motor starts jerking like when at 100khz. This is a proof that the PC is the problem, not the UHU.

All this & the motor is running way slower than when supplied 24vdc from the charger. the motor psu for uhu is around 30vdc because of the big capacitor & this should cover the lost 15% of the pwm.

I'll have to make some vids under EMC2 & compare, last time it seemed there was no speed difference between EMC2 & the direct 24vdc from the charger.

Not only windows costs money, but it also waists alot of your hardware performance to make you buy a newer PC more often. (2 to 4 years)

Thanks !
cnc2.

[H.O]

Hi,
Well, Paul was actually onto it before me so the credit goes to him ;-)

As for the Windows thing, Mach3 really does amazing things with Windows. When Art started doing Master5 (what is now Mach3) it was said to be impossible to get 8kHz from the LPT-port under Windows - which was what he aimed for at that time. He did it and the "world" was astouned, the rest is history.

If you really can get 150kHz out of EMC2 reliably that's quite impressive and if it does what you want then by all means use it. And no, I have no personal interest in either one of the softwares ;-)

[tenmetalman]

H.O.
You the man, I was just trying to zero in on the problem, it's always the the combined input that solves the problems
Paul

[cnc2]

Originally Posted by H.O Hi, Well, Paul was actually onto it before me so the credit goes to him ;-) As for the Windows thing, Mach3 really does amazing things with Windows. When Art started doing Master5 (what is now Mach3) it was said to be impossible to get 8kHz from the LPT-port under Windows - which was what he aimed for at that time. He did it and the "world" was astouned, the rest is history. If you really can get 150kHz out of EMC2 reliably that's quite impressive and if it does what you want then by all means use it. And no, I have no personal interest in either one of the softwares ;-)

Hi,

I agree Mach3 is an excelent software, it is complete & customizable (vbs), well supported & many users are happy with it, But the problem is windows...what Mach3 does under windows is comparable to finishing second behind Hussein Bolt with rackets(snowshoes) on your feet
Take the same developpers but without windows then Mach3 will be faster !

I've done another test under EMC2 & what i can say is :I never got 150KHz out of it yeah it was the theorical required speed to achieve the acceleration & ipm i entered & the reason for that is that i was new to EMC2 in the previous tests the real kernel speed was around 105KHz instead of 150, & in the last test i did, i found better settings & got real 125KHz were it was ~105khz before & i can say YES the motor spins really faster than under Mach3
but this time the computer was a bit more freezy than what it was at 105khz & it took some time to refresh the screen & respond to the mouse but the motor never knocked or jerked when i clicked or moved a window as it did under windows.

After a bit of reading the EMC2 doc i understand the reason why it is faster than Mach3 on the same hardware, it is because: Mach3 uses a driver to be fast under windows but windows processes still keep precedence over Mach3 disturbing the motor & making it knock & jerk, on the other hand EMC2 is "purpose built" it is comparable to an RTOS(real time operating system) it uses an open source real time library & runs in real time, yes i know very little about this technology but what i know is that real time software is "built for speed" i've read that it was really expensive & slow to developpe because the average monthly production of a guru developper is around 125 lines of code (yes per month) if Mach3 did run on an RTOS it would be simply unaffordable to the public...Thanks to the open source for making such things possible.

Now, i don't think it'll be possible to run 3 axis at 125KHz on my hardware but if it runs 3 axis at 75KHz it'll still be WAY better than windows.

In this last test at 125KHz i got 106 O-counts & i couldn't understand till i see that the drain wire had got out of the ground connector, it ran at 125KHz for a long time & i never observed a knock or a jerk it already did 0 O-counts @ 100khz with the drain wire grounded so 125 will be no problem at all.

Me neither, I have no personal interest in either one of the softwares, i just hate to pay to go slow while i can go faster for free(this statement couldn't be true, out of this context)

Please, do tell me if my english is poor, because i feel it reached its limits.

PS: in the vid the motor is changing direction several times, it is not knocking, in one direction the gear reducer makes more noise than in the other & yes it is not clamped to the table.

Thanks !
cnc2.

[cnc2]

Originally Posted by tenmetalman H.O. You the man, I was just trying to zero in on the problem, it's always the the combined input that solves the problems Paul

I agree !

IMO, competition is a good thing at the learning stage, but after that it is just good enough to divide people & make them easier to control by the bosses

By the way, who is running a machine with UHU's ? at which kernel speed ? some pc hardware specs ?

Thanks !
cnc2.

[H.O]

Hi,
You are correct that EMC2 runs on a RT kernal on Linux and Mach3 does not but Mach3 still isn't an ordinary windows application. Well actually Mach3 is a Windows application but the driver is not - it actually runs windows, sort of.

If you're really interested Art, the original author of Mach3, published a document where he goes quite a bit into the details about how and why it actually works. It's available on the Mach3 Yahoogroup, here's a direct link. It's a good read!

[cnc2]

Originally Posted by H.O Hi, You are correct that EMC2 runs on a RT kernal on Linux and Mach3 does not but Mach3 still isn't an ordinary windows application. Well actually Mach3 is a Windows application but the driver is not - it actually runs windows, sort of. If you're really interested Art, the original author of Mach3, published a document where he goes quite a bit into the details about how and why it actually works. It's available on the Mach3 Yahoogroup, here's a direct link. It's a good read!

Thanks for the reply Henrik !

I agree, Mach3 does wonders under windows, if you say that the driver is not a windows application so, it might be a sort of kernel module used to provide direct access to the hardware but the windows kernel still has priority over the Mach3 driver

Thanks for the link, i'm sure it'll be agood read !

Sorry but the link you posted, doesn't work I get the "document not found" message from the server, I think that you was loged in when you accessed the document, never mind.

After a google search of "Mach3Mysteries.pdf", I did find the document, guess where ... If you allow me to, I'll post the link on this thread.

Thanks !
cnc2.

[H.O]

Hmm, I had to Goolge for it myself to see where you might have found it. I'll save you the time and add the link myself ;-)

I though it might be fun/good to understand a little bit about how Mach3 actually works as it is not your average Windows app. Anyway, the most important thing is that you use whatever works for you!

[cnc2]

Thanks for posting the link !

Yeah, I agree it's not an average windows application & the least i can say is it took CRAZY programming to achieve & i like the way Art talks about the details of a Proprietary software to explain how it works, i've never seen this before on a commercial App.

I agree that one should use what works the best, but when it comes to Vcarve pro ...etc i don't think there's a cheaper replacement for it...If you know any then let me know.

Thanks !
cnc2.