[ccsparky]

David,

When I purchased my HobbyCNC kit I purchased two of the power supplies recommended by HobbyCNC. If you and Joe think it will work and you would like to try it let me know. I'm just over the mountain and it would probably get there by the first of next week if I send it out tomorrow.

I also have the Xylotex kit however I'm no where near set up to try it for you. It will be a while. Let me know.

[gtschance]

David,

In response to your question about my voltages:

My chassis is open at the moment so I just measured.

The power supply is running at 26.82 VDC with the board powered, three stepper motors connected and the fan running (I have one 24 VDC, 92 mm fan vs. the tiny noisy one that came with the kit). As I am in the midst of my permanent installation activities, the PC is not hooked up now so I could not look at the PS during movement. I forgot to look at the PS voltage without any load to see if it changed.

My Vref is set at 3.36 for all three drives.

When I was testing several days ago, I ran at various speeds, both as a feed rate during my air cuts as well as just testing via command input where I had set max velocity at various points.

I checked at 5, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100. I would jog purposefully by issuing a G0 X?? Y?? Z?? to ensure all three axis moved.

I also experimented with some very slow acceleration and some very fast acceleration (1 thru about 15 as I recall).

During my time with the mis-alignment problems, I could easily stall the motors but rarely would they miss steps (they would run right or stop, nothing in between).

I only hope when I get everything back together it works as well as it did when I last tested!!

Regards,
George

[David Da Costa]

Thanks George.

Thanks for your offer ccsparky, I'll let you know as soon as I hear from Joe.

[joecnc2006]

Thanks George.

Thanks for your offer ccsparky, I'll let you know as soon as I hear from Joe.

David did you try or can you try the two computer PSu's wired together to give you 24v. min. and over 10 amps?

CCSparky, what is the amps of your PSU ?

I Still believe 5 amps in not enough to make it work properly.

One other thing, can you take the shuttle out of the equation and use keyboard arrows? and change jog rate, or press the tab key in mach to use the jog feature with the mouse.

[David Da Costa]

Hi Joe,

Okay I think I might have to computer psu's so let me be clear before I blow myself up, I take a common and a +12v lead from each power supply and wire them together? and then connect those pairs of wire to the Xylotex board?

I'll check out the shuttle removed but I don't think that will make any difference as I get the problem running g-code.

[joecnc2006]

Hi Joe,

Okay I think I might have to computer psu's so let me be clear before I blow myself up, I take a common and a +12v lead from each power supply and wire them together? and then connect those pairs of wire to the Xylotex board?

I'll check out the shuttle removed but I don't think that will make any difference as I get the problem running g-code.

no you want to wire them in series not parrallel, let me find a step by step guide 1st before you do it.

joe

[David Da Costa]

Actually I think what I described above sounds like I would have wired them in parallel not series so Joe if you don't mind could you explicitly tell me how to wire it before I do blow myself up

[David Da Costa]

Our messages crossed, I figure that was wrong I'll wait futher instructions

[ger21]

ATX power supply daisychaining.
http://www.cnczone.com/forums/showthread.php?t=17548

[joecnc2006]

http://www.procooling.com/index.php?...s&disp=52&pg=1

Ger21 beat me to the other link. He is always fast on the draw. (must have a mile long favorates).

[David Da Costa]

Thanks Joe and Gerry I will try it today and report back

[ger21]

Ger21 beat me to the other link. He is always fast on the draw. (must have a mile long favorates).

Memory

[David Da Costa]

So nice to have you guys racing to help me

[David Da Costa]

Looking forward to getting this sorted. Building the machine now seems a distant memory

[David Da Costa]

Power Supply testing is on hold for today as it appears that one of the computer power supplies is dead.

I ordered two more from Newegg so I should have them early next week.

[joecnc2006]

Power Supply testing is on hold for today as it appears that one of the computer power supplies is dead.

I ordered two more from Newegg so I should have them early next week.

When i got some i bought from a computer repair place for 5.00 each, and wired 3 together.

can you call around and see if someone has some? atleast its cheap for testing.

Makesure they have close to the same rating, watts and amps.

[David Da Costa]

Yes, I will see if I can find some local. Radio Shack and BestBuy want $60 ea vs $17 from Newegg.

I ordered 2 300 watt ones from newegg.

Interestingly the instructions on ProCooling did not say anything about having to jump the green power on to a common to power the psu on.

[David Da Costa]

I am going to try changing the microstepping on the z axis to from 1/8 to 1/4 to see if there is any difference in behavior (not really expecting anything but it may change the resonance.

[joecnc2006]

Here is a glossary of stepper motor terms if someone need a quick explination.

http://www.amci.com/tutorials/tutori...sary-terms.asp

joe

[David Da Costa]

Well I just tried 1/4 stepping on the z and it sounds much better (smoother) with no resonance. I just ran part of my test g-code and apart from one motor stall at the beginning it seemed to run with no lost steps.

I am going to change the y to 1/4 stepping to as that motor tends to resonate. As per someone else mentioned (I think George), my x is fine so I will leave that at 1/8.

back to testing.