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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > RF-45 Clone Mill > eBay 3 axis axis servo motor/driver package questions
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  1. #1

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    Sep 2018
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    eBay 3 axis axis servo motor/driver package questions

    I’m sure this has been asked before, otherwise they wouldn’t be scattered all over eBay, somebodies gotta be buying them. But I haven’t been able to find a single review from anyone who has used these. A little back story about me though, I have a zx45 from Bolton tools that I’ve been using manual for several years now, and I want to convert to cnc, I’ve read several of the build threads, and have a very general idea of what to do, but I am a complete newbie in this area, aside from messing with 3d printing and fusion 360, I know very little else.
    So my question is, would this kit be worth while, or are their better options out there? Here is the link to eBay. I like that it comes as a kit, meaning it is hopefully most of what I will need, and the components will work together. But again, I don’t know much about this. Yet.

    https://ebay.us/irucNr

  2. #2

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    Sep 2018
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    Re: eBay 3 axis axis servo motor/driver package questions

    Well I have grown a lot these past few days, read everything I can, I believe just basic steppers would work fine, but if I’m gonna do it, I want to do it right, so I’m leaning towards closed loop Nema34 steppers. The question is what software(I’ll be learning from scratch) I think I’ll go for unccnc or Mach4, or Linux, haha, guess it just depends, either way there will be a steep learning curve. Any recommendations for which motion controller and bob?

  3. #3
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    Sep 2006
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    Re: eBay 3 axis axis servo motor/driver package questions

    Let me ask you: Do you think that $1100 spent on an ebay package is a bargain versus $1575 from a company that does this as its main business and has been around a long time (i.e. DMM-tech https://store.dmm-tech.com/products/...c-servo-system ) and can and does provide support? (see other builds on here that have used these DMM systems)
    I'm not going to get into the whole debate of what size motors is right and simply spout my opinion on a few other points.
    Just think about finding compatible parts in the future - where are you going to find them - ebay again? good luck with that. So yeah, people can buy it and it can work, but if this is a longer term investment then ebay shouldn't be the source for this sort of part. Think about down time - how long are you going to be willing to wait to get your machine back up and running in the event something breaks (can break due to outside influence too - i.e. you drop something on a critical bit or send it past a limit by accident).
    Also - something not always considered (just like with 3D printers) is safety. And there are a couple of areas of safety that should be thought of. First is electrical - ebay one is taking in high voltage AC (220V) - I see no safety certifications listed, not even CE which is completely self declared on most items like this (no 3rd party auditing to make sure you're doing things right). Are you willing to turn your machine into a giant electrocution hazard? (The system I linked to above uses a reputable name brand PS to convert AC to 48DC - a relatively safe voltage).
    Next is the drives themselves - if they run away that's alot of power - people forget how much 750W is (basically 1 HP) - that can do a lot of damage, to your machine or you. How much do you trust these drives to behave properly?
    But at the end of the day its your choice.
    That's my opinion, worth what you paid for it

    Mike

  4. #4
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    Re: eBay 3 axis axis servo motor/driver package questions

    I can't comment on unccnc as I know nothing about it, but I can say that LinuxCNC along with an Ethernet Mesa interface card (in my case the 7i76e for "steppers") has been great - and the latest release of LinuxCNC (with the operating system) is great - I was able to install on a brand new SSD in less than 20 minutes. The Mesa card will give you the ability to control 4 axes, a spindle and way more IO than a basic homebrew cnc conversion will need (home and limit switches, probe input, tool touch off, coolant or mist relay control, not sure what else would really be needed but if you do there are even more capable cards from Mesa.
    Also the initial setup of a Mesa card has been greatly improved as well in LinuxCNC with the included pncconf utility, Still need to manually edit files to add some stuff (like a USB pendant), but I think that's the case for most of these systems as they can't support out of the box every possible thing that can be plugged into them.
    And the LinuxCNC forum is full of active users willing to help.
    Mike

  5. #5
    Community Moderator ger21's Avatar
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    Re: eBay 3 axis axis servo motor/driver package questions

    but if I’m gonna do it, I want to do it right, so I’m leaning towards closed loop Nema34 steppers
    The only benefit to closed loop steppers is that they can stop your system when they stall. They don't have any more power than open loop steppers.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  6. #6

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    Sep 2018
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    Re: eBay 3 axis axis servo motor/driver package questions

    TLDR: I ordered a bunch of stuff, including an ESS and c11g, What recommendation for software do you have for a complete newcomer to cnc? Mach3 or mach4, and it looks like I may need additional software like wizards, and add ons...? Any recommendations for those? At some point I would like to add a hand held pendant?(I believe they’re called) of sorts.
    I missed your replies before ordering or I would have given more thought to linuxcnc, I went the Mach route as I figured their might be more info in terms of forums and online groups.
    I ended up getting these from stepper online, they’re relatively cheap, but still twice as expensive as their cheapest versions(possibly a waste of money, we will find out). https://www.omc-stepperonline.com/tp...h=1-cl86t-p120
    I also ordered some eBay special ballscrews, 2005 series for all 3 axis, i can upgrade in the future if I need to. And keep in mind, this a Chinese mill, no need to run top of the line parts for a conversion built by me. I also ordered an Ethernet smoothstepper and c11g boards. I almost went the Mesa 7i76, but ultimately decided on the warp9 products due to them being more popular and thinking it would be easier for me to get help with if needed. I ordered limit switches and an e-stop as well as some various shielded cables and a kl7220 72vdc toroidal power supply and a 5v switch mode supply which I believe I need for the ESS.
    I will be running all 3 axis direct drive to the ballscrews, with a belt drive to add a handwheel on the Y and an extra long ball screw on the x to add a handwheel on the opposite side of the table as the stepper motor.
    Now my question remains if I should go with Mach3 or Mach 4? It seems the general consensus is that they’re both not very fine tuned, but Mach3 no longer has support, but does have more in terms of “add ons”? I have 2 PCs to choose from, one with windows 7 and one with vista, i also have a pci card and the drivers to add a parallel port if needed.
    I found a cad file for a very similar mill that I have been reworking with my design. here is a screenshot of where I am at with it. I already made and installed the column spacer that raises the column an inch and moves it back 1.35" it also allows me to use 3 bolts on each side of the column to bolt it down. the very front bolts only go through the spacer.
    Attached Thumbnails Attached Thumbnails millscreenshot1.jpg   millscreenshot2.jpg  

  7. #7

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    Re: eBay 3 axis axis servo motor/driver package questions

    I should also ask if I am missing anything? or to word that better, the holiday season is coming up, and COVID could screw up shipping and warehouses delaying shipments in the near future, so any recommendations of what I may be missing and should get ordered now that I may need for the build.

  8. #8

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    Re: eBay 3 axis axis servo motor/driver package questions

    Parts are trickling in, I planned on getting 3 more ball nuts so I could double them up, but these seem quite tight as is, I may run with it and see how it goes, they have absolutely zero slop, but an indicator will be the only real way to check. I also 3-d printed a y axis mount and the timing belt gears for the handwheel I want to add.

  9. #9

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    Sep 2018
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    Re: eBay 3 axis axis servo motor/driver package questions

    I think I have everything done to put the x axis together, I had to make the motor mounts out of steel because my shipment of 3/4” aluminum is delayed, I also had to 3d print a nema34 motor to test fit stuff because my shipment with the motors and drivers is also delayed. I had to remove 2mm from the ball it mount, and put new countersunk bolt holes to mount it, and I removed 3.8MM from the bottom of the ballscrews bearing blocks, doing this I can retain the same bolt center as the original and have plenty of clearance without having to mill the bottom of the table. For the y axis I had to cut out an offset hole lower from the original in order to drop the motor and lead screw down about 10mm from original otherwise the saddle would hit the motor. I think it’s coming together pretty well. Here is some pics.
    Attached Thumbnails Attached Thumbnails F15B4197-2F60-4D9A-8911-566C970D13F6.jpg   CDB0F725-2EF4-4E40-8770-9864F4CA88E7.jpg   47794E98-4F63-461F-B407-18739DE5233C.jpg  

  10. #10
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    Re: eBay 3 axis axis servo motor/driver package questions

    but Mach3 no longer has support
    I have cnc router with mach3 for long time, I have no problem with no support. I found a lot of mach3 on u-tube. I found mach3 and electronics/accessories were a lot cheaper and easy to find and easy to install. I don't think mach3 will die. I use mach3 for lathe also no problem and cheap with handwheel/mpg for setting up easier. For cad/cam, I use fusion 360.

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