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    Nema17 motors driving 1204 ballscrews? ...that ok? ...or will I see the CNC police knock on my door?

    Ok, here's my dilemna.

    My first machine I built (a rite of passage I think)...been there done that...my engineering skills suck & therefore my machine sucked - I won't be building anymore.

    My Second (present) machine a modest sabel 2015 (http://www.cnc-sable.nl/images/sable%20text.jpg) ...fairly well constructed, certainly rigid enough for the stuff I cut (pcbs & the odd bit of acrylic)...the problem is insufficient accuracy. This machine uses bog standard M10 threaded rod & drive nuts of uknown parentage/pedigree (but I suspect are in the delrin accuracy scheme of things) ....& I'm now milling quite small SMD PCBs - I need more accuracy (& ideally a bit more speed...I do like a whizzy machine)

    So, I could just upgrade my present machine to a new one ...but I've a penchant for fixed gantry machines (I like how much quieter they are - I've neighbours & a wife to consider as I do this in a spare room) & they're not that common....in fact they seem quite rare - especially those fitted with ballscrews/nuts.

    I've found a Chinese supplier (http://redsail.en.alibaba.com/produc...a_RS_3020.html) ....bottom line is it's gonna cost me the guts of a grand after import duties etc & to be honest I don't even need the extra size (it a 3020...not that big...but still bigger than my 2015)...just the accuracy. Now to me, a grand seems a lot to pay for the small gain in accuracy I seek over my present machine!

    That said it seems well made & specced, for example, here's the innards of the control box ...

    )

    (at least it's not a woeful Yoocnc stepper driver single pcb board in there!)

    So then I wondered could I just simply upgrade the leadscrews on my existing machine to ballscrews/ballnuts (total cost would be approx £100 - I like!) ...having done the measurements & looked at ballnut dimensions, I think I might just be able to get away fitting SFU1204-3 ballnuts onto my present machine ....but my Sabel 2015 machine has small nema17 motors with 5mm shafts...would this be a crazy match for 1204 rods? (alas, IMHO it's not going to be practical to upgrade the motors to nema23...on account the present nema17 casing edges are flush with the rear of the CNC gantry uprights...if I replaced with nema23....two of the NEMA23 mounting holes would see fresh air at the back (ie they'd had nothing to screw into)...at a push I guess some form of plate could be made to allow me to use nema23, but then the project gets bigger (& like I say, I suck with anything involving metal/accuracy!)

    therefore I think I might be stuck with nema 17s...so like I say, would nem17s be be too much of a mismatch for 1204-3 ballscrews/nuts, the spec of the motors on my machine is here...

    1. Step angle: 1.8 degree
    2. Number of Phase: 2
    3. Hold torque: 4.4 kg.cm
    4. Rated current/Phase: 1.68 amps.
    5. Phase resistance: 1.65 ohms
    6. Voltage/Phase: 2.77 VDC


    Thanks in advance.
    Last edited by HankMcSpank; 18-06-2013 at 09:25 PM.

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