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Type: Posts; User: rexstep

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  1. Replies
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    Re: How do I ID the leads on a 8-wire stepper?

    I'll give it a whirl, thanks!
  2. Replies
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    Re: How do I ID the leads on a 8-wire stepper?

    Thanks for this. The idea intrigues me. I have four pairs. But I have no way of knowing within a given pair which one is + and which one is -.
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    How do I ID the leads on a 8-wire stepper?

    OK, so here's my problem: Bought these from China for a customer but it turns out the leads are not correctly matched to the coils according to the wiring diagram. I know my customer is not the...
  4. Thread: SX3 build

    by rexstep
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    1,211

    drives to parallel port hook up

    We at Homeshopcnc thank you for the mention. I would however caution you to use a breakout board between the drives and parallel port to protect your computor from possible voltage spike harm and...
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    steppers made for G540/G251

    Hi Guys,

    I saw some discussion about which steppers are well suited the G540. We don't have them up on the website yet but we have two new motors wound to 3.5A - one in series, one in parallel -...
  6. wiring diagram

    Email me at www.homeshopcnc.com and I'll send it to you.

    -Rick L.
  7. Thread: Cheap drives?

    by rexstep
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    144,100

    3.5A matching motors

    Our 8-wire Nema34's are 3.5A-4A in series. At 48V in series the upper speed torque won't be what it would on a G201 in parallel but it might suit some price sensitive applications. A 960 oz/in 3.5A...
  8. Thread: Cheap drives?

    by rexstep
    Replies
    1,792
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    144,100

    3.5A matching motors

    A drive like that ought to have a suitable dancing partner. We've called out new windings for 3.5A (fat)nema 23's in 2 and 3-stack. We should have them in about six weeks for any who are interested:...
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    The spindle is very good

    Hi Guys,

    Rick from Rex Machine Industries here (homeshopcnc.com). The spindle is tech supported by GorrillaCNC out of Canada. We had them test out a sample before ordering them in quantity....
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    bent ballscrews

    I don't have a lot of experience with ground ballscrews but I've straightened dozens of rolled screws received out of spec from Thompson and Nook alike. Unlike ground screws, rolled screws have to...
  11. Replies
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    binding issues on rolled screws

    Finding the right size balls for preloading is a trial and error event. Ideally, you would want four point contact but as someone pointed out, that tends to cause binding on rolled screws.

    What we...
  12. Replies
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    excentricity

    The OD of rolled ballscrews is always out of concentricity with the balltrack to some degree. This will also contribute to whipping. And other problems especially if you have a preloaded set-up.
    ...
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    replacing balls

    You don't want to try to match new balls in with the originals. You need to replace all of them. If you add six new balls in and they're even .0001" larger than the ones you have, only the new ones...
  14. protecting stepper

    It's not an easy problem to solve because most solutions hurt the stepper's ability to shed heat. If you enclose a stepper in an aluminum box say, you are trapping it in there with the heat it gives...
  15. motors, drivers etc. for BF20

    If you haven't bought your components yet please check our products and prices. We can save you some $ I think: www.homeshopcnc.com

    -Rick
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    We just got stock of 20mm LM guides in a couple...

    We just got stock of 20mm LM guides in a couple of weeks ago. They are heavy preload for metal working and are available in both wide and narrow carriages: www.homeshopcnc.com

    -Rick
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    double row preload

    Hi NC Cams,

    I readily admit that I am not a bearing expert but I know that Universal Thread Grinding Company, makers of a very high-end preloaded leadscrew product, offer their assemblies with...
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    double row preload

    Double row angular contact bearings DO come preloaded but I don't know if they come non-preloaded. I have some and they are certainly preloaded.

    You can easily tell: try to axially move the inner...
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    coupling backlash

    Try wrapping teflon tape around the flexible insert- probably a single turn- and then wedge it back in to see if it fills the gap thus removing the lash

    Rick L.
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    CNC for BF20

    We can help you get your BF20 CNC'd. Take a look at our website www.homeshopcnc.com

    Contact us through the website and we'll tell you how to get started with either a servo or stepper based...
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    added stiffness

    Filling the column with PC will not only add stiffness, it will add a heck of a lot of it. I found this out when I puchased a kit of Anocast PC to fill the columns of X2 mini mills. The mills are...
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    HomeshopCNC ships to Turkey, no problem.

    Hi, Not only will we ship the G201's to Turkey but it will be relatively painless.

    (3) G201's at $109/ea plus $35 for shipping/handling comes to $362.00

    Email me at our website:...
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    steppers and servos

    I don't think we're in disagreement necessarily. Remember that my comments are in responce to the other esteemed member's blanket statement that servos are better.

    0.0001" is a very tight responce...
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    low speed torque

    Ah, I misread your initial post and thougut you using a unipolar driver.

    10 volts is unusually high for a rated voltage since that value is supposed to tell you the minimum amount of volts need to...
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    stepper or servo

    Ok, let's be fair because the question is application specific. For example, you can say that servos are usually better for high speed routers. But I would always select steppers where low speed...
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    stepper speed

    Steppers are current driven. Think of voltage as the pressure that forces current into the coils because that is it's function in powering steppers. My guess is your voltage is way low. Try a 60 volt...
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    interface board

    Russell,

    Check out some of the board options at www.pmdx.com and www.cnc4pc.com A hole range of choices there.

    Rick LaLonde
    www.homeshopcnc.com
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    RHT23-1200 on the knee

    Vince, Even the RHT34-1780 needs to be on a 2:1 ratio to power a full size knee. Since you have a smaller knee mill, you'll want to do the same with a 1200.

    A good design tip would be to run at...
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    Poll: steppers vs. servos

    Steppers are dinsour controls motors.


    -I think you means dinosaurs, but I digress. Let me point out:

    1)steppers are far superior in holding torque output

    2)they don't...
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    voltage

    Rick from homeshopcnc here.

    You can with confidence run the 260's together with the 640 from a single power supply from anywhere between 48-68 volts with excellent results. If you want to get as...
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