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Discussion in 'CNC Mills/Routers' started by evil2002usna, Mar 27, 2016.
Cheap Ballscrew Ox CNC Router.
evil2002usna published a new build:
Read more about this build...
I really like the rigidity and squareness this could give you, especially if one finishes the ends of the C-Beams on a milling machine. Fine adjustments of squareness could be accomplished with very thin steel or brass shim stock. Great idea. Can't wait to see more!
I too would like to use ball screws. May I ask what you are paying for them and where you get them?
Also I have 3v NEMA 34 steppers left over from the upgrade of my Tormach PCNC 1100 from Series 2 to Series 3. I have been planning to use those for the Y and X axes. They are beefy suckers but they are so strong that they'll have no trouble carrying a heavy gantry around. Also I like their speed. I am using them now on an old non-OpenBuild's build I made 2 years ago. Using 45 VDC and 7 amps I can scream along at 300 inches/minute using a 10mm pitch ball screw directly connected to the motor shaft through a spider coupler. I know they can handle more voltage than that so who knows what maximum speeds could be realized. My build does both plasma and wood routing with a relative quick changeover of adapters and spoil material. When I saw the C-beam for the first time I knew I wanted to use them for rigidity and the ability to shield the ball screws from debris. I am working on designing more shielding using a soft plastic material that runs the length of the Y rails and is pushed slightly out of the way when the Y motion occurs.
I bought three 700mm ballscrews from Amazon for $113.00 a piece. They come with the nut and the two bearing blocks on either end. Basically it is the cheap chines SFU1605 ballscrews they sell everywhere. The plates were specifically designed with this type of ballscrew in mind. I also just received the ballscrew nut housing from Amazon as well, i had to wait a little while longer for those since they werent a prime purchase. You can buy longer ballscrews from ebay for probably close to the same price if you are willing to wait a little longer form them.
Just cut the first Y-Gantry today and mounted one of the Ballscrew housings. Everything is progressing as planned.
Now, that is looking really good.
And one more gantry. The only thing slowing me down now is trying to keep the wife happy by not spending too much money. My larger Ox has been performing beautifully. I don't know if I mentioned in earlier posts but I also plan to run this CNC with the same Clearpath servo motors I am using on my larger machine. Check out Neo7CNC on YouTube if your not sure what I am talking about.
Yes, the Neo7 is a nice machine and those servos are sweet!
There is a thread about keeping your wife "happy" somewhere here.
I think it involved bribery.
Remember: A man has got to do, what a man has got to do.
Sneaky is Best.
Finally got around to cutting the extrusions to length to fit the Ballscrew I purchased for the Y-Axis. I was putting it off because I had to take the machine apart again and I was worried about cutting it too short. Well luckily I got it right on the first try. Now I just need to buy the rest of the extrusions for tge x-axis and finish cutting the gantry plates on my cnc.
Looks like a nice beefy system in the works
Finally got the x axis pieces put in now just need to design the Y-Axis. Uni
Looks really good thus far! I also really like the rover setup. If that channel on the x isn't being used have you considered adding in a 20x40 piece to add some extra rigidity?
No, I was actually planning on supporting the x-carriage with polycarbonate wheels on the inside and outside of the C-Beam with the open space. I was hoping that would add rigidity in a different way. It might be overkill, but so is this whole project.
Good Deal! I look forward to your outcome