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Type: Posts; User: joeavaerage

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  1. Replies
    7
    Views
    85

    Re: Picking a stepper motor

    Hi,
    here are three examples (from Leadshine's website), all 34 size.

    The smallest of them at 500oz.in is also the lowest inductance and retains its torque at speed better than its bigger...
  2. Replies
    7
    Views
    85

    Re: Picking a stepper motor

    Hi,
    this is 23 size:

    Object reference not set to an instance of an object.

    and 1.18mH.

    Craig
  3. Replies
    7
    Views
    85

    Re: Picking a stepper motor

    Hi,
    what first time buyers overlook is the inductance specification. The windings have inductance and that inductance degrades the motor
    torque at speed. Look for the most powerful (torque) stepper...
  4. Replies
    8
    Views
    37

    Re: speed vs torque graph for stepper?

    Hi,



    This is incorrect. The current limit is effectively set by thermal considerations, once you reach the thermal limit you can't increase the current without
    overheat damage.

    That figure...
  5. Replies
    8
    Views
    37

    Re: speed vs torque graph for stepper?

    Hi,
    its generally true that low resistance steppers have low inductance, but its not an exact rule.

    High current usually means fewer turns of larger diameter wire which also happens to be low...
  6. Replies
    8
    Views
    37

    Re: speed vs torque graph for stepper?

    Hi,
    isn't it a bit late to ask about that AFTER you've ordered and paid for them?

    What they do publish is the specs, particularly the inductance...which they claim to be 2.5mH. That's not great...
  7. Replies
    4
    Views
    37

    Re: Lead screw selection questions

    Hi,
    the NSK design formulas cover the situation where there is only one bearing and one end free. Naturally the possibility of the screw whipping is very much
    exacerbated by not having both ends...
  8. Replies
    6
    Views
    189

    Re: Surface Plates Granite

    Hi,
    yes I would be interested in a good granite plate. My current mill project has 700mm beds so I would be looking for 800-900mm length.......is that
    doable?

    Craig
  9. Replies
    4
    Views
    37

    Re: Lead screw selection questions

    Hi,
    un-supported length and axis speed will determine what size screw you need, given that the weight (momentum) of your axes is very modest.

    The general rule is that is the screw travel is 5'...
  10. Replies
    12
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    51

    Re: Spindle selection

    Hi,
    yes Mechatron are not cheap, beautifully made though.

    The example you linked to looks good....hard to believe they can make and sell it so cheaply.

    Craig
  11. Replies
    12
    Views
    51

    Re: Spindle selection

    Hi,
    50 Hz supply means that the rotating magnetic field rotates 50 times a second therefore 50 X 60 = 3000rpm.
    In the US with 60 Hz supply synchronous speed would be 60 x 60 = 3600rpm.

    Craig
  12. Replies
    12
    Views
    51

    Re: Spindle selection

    Hi,
    in my case I found that I needed two spindles, one a highspeed low torque unit for aluminum, plastics and engraving, and a second low speed high torque
    spindle for doing steel.

    Big...
  13. Replies
    12
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    51

    Re: Spindle selection

    Hi,
    about 2kW is the effective maximum for a 230V single phase household supply. Even then you will need a circuit with at least 2.5mm2
    wire and a 20-25A fuse.

    VFDs are notorious for drawing...
  14. Re: Mach4 looses configuration after restart

    Hi,
    exactly how are you shutting Mach4 down?

    When Mach4 shuts down it will run the 'Screen Unload' script which should flush any and all settings plus all the 'persistent' registers
    to the .ini...
  15. Replies
    166
    Views
    4,292

    Re: Which bits to use for PCB milling?

    Hi,
    when I first started becoming interested in CNC it was specifically to mill PCBs. I thought if I was going to buy/build a machine then I would
    want it to be capable of more than just...
  16. Replies
    2
    Views
    23

    Re: Adjust bearings in BK style mount?

    Hi,
    my understanding is that angular contact bearings for such purposes are sold as a matched pair. They are ground
    in such a manner that when the outer annular rings are clamped the inners are...
  17. Replies
    166
    Views
    4,292

    Re: Which bits to use for PCB milling?

    Hi,
    I have started a new mill project. I'm not unhappy with my original own-design mill but it has faults, some easily correctable and some not.
    I have the funds (temporarily) to build a bigger,...
  18. Replies
    15
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    179

    Re: Seek advice on small vacuum pump.

    Hi,



    I'm sorry you are not going to be able to avoid it, it is how rotary vane vacuum pumps work. If there is any significant flow through the pump it
    WILL generate an oil mist. Single stage...
  19. Re: Artsoft's Mach3 Verse Mach4 Motion Control Software

    Hi,
    the correction was provided by smurph, the lead developer of Mach4 at New Fangled Solutions, formerly Artsoft.

    Additionally I have used two out-of-band axes with Mach4Hobby....so I know it...
  20. Re: Is a Harmonic Drive best solution for a 4th axis?

    Hi,
    I have low backlash (<2 arc min) 10:1 planetary gearboxes on my steppers. They have been great. According to the Vexta website these gearboxes/steppers
    should produce a stall torque of 6Nm. In...
  21. Re: Artsoft's Mach3 Verse Mach4 Motion Control Software

    Hi,
    correction.........Mach4Hobby has six out-of-band axes just like Mach4Industrial.

    Craig
  22. Replies
    15
    Views
    179

    Re: Seek advice on small vacuum pump.

    Hi,



    I use a vacuum to bag epoxy/glass on foam. I require only 1-2 psi vacuum or the foam gets crushed. To do this I have a vacuum ballast, a largish tank. This means
    that the pump cycles...
  23. Replies
    9
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    252

    Re: Question on Mach3

    Hi,
    you'll get more help on the Mach forum.

    I use Mach4, and I could write a script for doing as you want in Lua. I imagine that you could do the same with Mach3 and Visual Basic
    but I hate...
  24. Replies
    9
    Views
    603

    Re: Advice wanted (mil for PCB)

    Hi,



    I disagree. When you design a circuit board and have a service make it for you pay for all the photomasks and so on. That's not cheap. If you have 50 boards made it
    certainly is cheaper...
  25. Re: New Control Build with Mach 4 - Flooding control

    Hi,
    Mach4s Estop stops all axis motion and spindle. If you want other items to stop or behave in some specific fashion add the appropriate script
    to the <Estop> button.

    Craig
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