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twistedfuse

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  1. Hello MP, Thanks for the quick reply. I didnt really expect it to be that quick. As for the power supply ill be using an old ATX power supply retrofitted to be a lab supply with a 10w 10ohm resistor for load. I'm pretty sure i remember that computer supplies only give the neccisary current needed but i would just like to know how to figure out the steppers surrent usage anyway as i like to know for future projects and knowledge. As for the computer i was lucky enough to get a free toshiba laptop from way back (one of the first satellite series) and it has 98 and was thinking of running it on that with turboCNC. As for the controller i have seen some of the l297,298 chopper controller but it seems to be a bit more difficult to make where as i like the UCN5804 because of the simple layout and size. I have actually sourced the chips finally from an aussie dealer ($22 each) bit heafty compared to the $5 each l297/298 price. If the xyz chopper type controller is better which is the best design cause i have seen a few. Also is anyone willing to do some boards up if im too lazy to etch them myself (of couse ill throw money their way). Cheers, Daniel
  2. Hello All, I have recently been browsing non stop to find a great CNC stepper controller so i can build my first CNC milling machine for my PCBs to make it slightly easier to make double sided PCBs. I was just wondering if anyone here from Australia could point me in the right direction to find the UCN chips or similar. I read in this forum that the 5804s can be replaced by the 3967 or3977 chips(not pin for pin) is this correct? I dont mind making heaps of off board connections. Such as im too lazy to order in the resistor network and have way too many 4k7 resistors so ill probably use veroboard with wiring to make similar. Also just to verify. My motors have 0.66A stamped onto the XY motors and i need another do i need to find another similar motor for the Z axis? I also wanted to know some calculation confusions. Say i had 3 of the 0.66A motors, My current draw would then be something like 4 coild times by 3 motors = 12, therefore 12 x 0.66A = 7.92A. Is this correct? Also if this is correct for the different motor on the z axis could i just figure out the 8 * 0.66A (xy motor) + 4 * (new motors current draw)??? Also with the programs i will be running an old computer with 98 on it.I like the sound of turboCNC but would like to know what people think is best suited for this OS. Thanks in advance. Daniel
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