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Messages - Popeye

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1
General Mach Discussion / Re: Step losses in specific displacement
« on: August 15, 2007, 02:19:43 PM »
Thank's a lot for this very interesting thread !
I can't say that the sound I witness is the same as the machine is mechanically different but I'm quite sure that the phenomenon is identical.
The difference with and without the damper is amazing ! I actually thought about a kind of fly wheel but I wasn't sure if it would really be efficient.
I think I will study this solution as, as mentioned, what I've done may have just moved the resonance frequency to an other rotating speed.

Nb : I also use Xylotex control board and the motors I have are the reference 23LC100-025-8W (details here : http://www.stappenmotor.nl/Stappenmotor/Stappenmotoren/Stappenmotoren_globaal_overzicht.htm)

Thanks
Jean-Louis

2
General Mach Discussion / Re: Step losses in specific displacement
« on: August 08, 2007, 12:35:12 PM »
Hi Jim,

You're probably right when you say that the voltage may drop more than what I see on the voltmeter (even though I used an analog voltmeter that is better than a digital one for such a measurement), but I clearly get a more stable voltage since I made this new power supply (the previous one dropped down to 15 V when running the same program).
However everytime I had these step losses, it occured after having reached the rated G0 speed. It means that the motors were not accelerating anymore (you actually made me realise that :)), and that's why I finally don't think that it was due to a power supply problem, even if I actually really had one.

Jean-Louis

3
General Mach Discussion / Re: Step losses in specific displacement
« on: August 07, 2007, 07:55:07 PM »
Hi everybody,

I made new test today with my new power supply and despite a voltage drop that is now limited to 1 V maximum, the problem still occurred.
The "sound" of the machine on this particular segment (about 45Ā° angle, positive X move and positive Y move) was really like a vibration so I slightly modified the fixing of the Y motor (I actually added one fixing point) and since I made this modification, I ran about 10 or 15 times the same program without any problem (I previously had it about once every 3 attempts). The sound is now different and I think that it is definitely linked with a resonance frequency, and this frequency has probably been changed by modifying the motor assembly. I have to run several other programs, hoping the resonance frequency has been moved out of the range I meet on my machine.

Jean-Louis

4
General Mach Discussion / Re: Step losses in specific displacement
« on: August 05, 2007, 05:50:20 AM »
I've ordered the components to make a new power supply but I'll keep think link and contact them if necessarry
I'll confirm you if the problem has been definitely solved by changing the power supply

Thanks
Jean-Louis

5
General Mach Discussion / Re: Step losses in specific displacement
« on: August 02, 2007, 12:10:32 PM »
http://www.kelinginc.net/SwitchingPowerSupply.html

That is where I get my Power from ;)
http://www.kelinginc.net/SwitchingPowerSupply.html

The prices are actually very good. Unfortunately 120 Vac imput voltage is not suitable for French network.
I checked different solutions and I will finally do my own supply. It will cost about 60 Euros.
The output voltage will be rated about 25 Vdc while the stepper motor board can accept up to 35 Vdc so if the voltage is slightly higher when the motors are not running, it should remain within the driver board limits.

Thanks everybody for your help
Jean-Louis

6
General Mach Discussion / Re: Step losses in specific displacement
« on: August 01, 2007, 07:05:13 PM »
Thanks Jim, it could be an interesting alternative. I don't know the cost for 2 batteries + 24 V charger compared to a new power supply but I'll have a look.

Jean-Louis

7
General Mach Discussion / Re: Step losses in specific displacement
« on: July 31, 2007, 06:46:34 PM »
You're a very clever guy Brian. I think you pointed out the problem.
I made some test using a lamp to load the power supply at about 3 A. When I connect the lamp, the voltage drops down to 15 V for a while before recovering its rated value (27 V). And when I disconnect the lamp, the voltage then rises (I don't know how much, the power supply voltmeter stops at 30 V) and the overvoltage protection trips. I probably have a voltage regulator that is failing.

Thanks a lot for your help
Jean-Louis

8
General Mach Discussion / Re: Step losses in specific displacement
« on: July 31, 2007, 04:16:51 PM »
Hello Brian,

I actually didn't think about the power supply. Could you please explain what you mean by "power supply is browning out" ? (sorry, English is not my mother languageĀ   :P)

Thanks
Jean-Louis

9
General Mach Discussion / Re: Step losses in specific displacement
« on: July 31, 2007, 12:47:32 PM »
Hello Hood,

Thanks for your aswer.
I checked the enhanced pulsing and it is already enabled.

Jean-Louis

10
General Mach Discussion / Step losses in specific displacement
« on: July 30, 2007, 04:42:05 PM »
Hello,

I have a problem on my CNC machine that I couldn't solve for the moment.
With a certain combination of X and Y movements, I sometimes loose steps on the Y axis. It occures during a G0 movement and always on the same displacement (same combination of X and Y axis). The G0 speed is set lower than the maximum speed capacity of my machine and there is no mechanical problem.
It seems to have link with the frequency generated by this particular movement combination.
Does anybody have a clue how to solve this problem ?

Thanks
Jean-Louis

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