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  1. #1
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    Urbs New Build

    After much thought and procrastination onto my 3rd and hopefully best build. It'll be hobby grade in aluminum extrusion. I chose aluminum extrusion for ease of assemble while meeting my accuracy and rigidity requirements. I ordered the extrusion from a Canadian supplier MakerParts and the rails from aliexpress. Hardware from all the different sources to whatever is convenient at the time. The work area will be around 50"x30"x8" with the X axis being the longest so I can use the table as a desk when not in use. I found the longer 1500mm cbeam extrusions flex quite a bit so I mated 3 of them together which seemed to provide adequate stiffness. Still have to tie the back of the beam together. The last thing I did was to mount the 20mm rails on the gantry beam. Some work with the dial indicator up next. The drive system will be R&P from avidcnc. I originally wanted ballscrew but R&P is accurate enough and the easiest to for me to mount. I'll use the electronics, motors, and vhd/spindle from my 2nd cnc, a joes2006. All the plates will be mocked up in 3/4" plywood then likely 1/2" aluminum plate when I finalize the design. I've designed the gantry sides but need to hit the hardware store for some ply.

    Maybe an update in a few months as I plan to take this slow. Very slow. Posts are always better with pictures.....



  2. #2
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    Re: Urbs New Build

    Attachment 458800Click image for larger version. 

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    Opps. I guess google photo's requires permission to access saved files. Here are the pictures.

  3. #3
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    Re: Urbs New Build

    Small update. Cut the top brackets for the gantry. Although my joes2006 may not be very good it's a whole lot better at accuracy than I am. Makes a huge difference with the many precise holes. You can see where the two sided tape let go luckily at the end of the cut so only superficial damage. A good reminder to myself to ensure the workpiece is securely fastened down. Screws next time. Not sure the 8020 is suffice for the gantry wall. I know it's use on the openbuilds lead machine so I'll just have to see how that goes. If there is too much deflection I'll get some 8040 or cbeam like the avidcnc stuff. Same with the plywood plates. Still intending on going with 1/2" 6061 plate but that might end up 3/4".

  4. #4
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    Re: Urbs New Build - Update #3

    Got around to making the bottom gantry plates. Learned my lesson and screwed down the workpiece this time. I tried climb cutting for the first time. Interesting. I think the tearout means my bit is no longer sharp. I should really stop being so cheap and use a new one. The two plates allow me to experiment with the amount of clearance. Once finalized the height of the gantry sides will be cut as one plate. I love peteeng's suggestion of laminating an aluminum skin to the plywood. May try that instead of the 1/2" aluminum plate but that's to be decided later after I see how it runs on the ply plates. I've decided to try ballscrew on the X so I ordered a pair of 1616's from bstmotion. I'll be taking a cue from v0dka's plan and running the ballscrew under the xrails using a plate screwed to the bottom of the extrusion. Tapped the extrusion while the plates were being cut. Found a m5 tapping guide on thinguniverse which works very well. https://www.thingiverse.com/thing:2105706

    Next step is to mount the gantry to the X so I can finalize the 4020 crossmembers. Maybe make a stand but I haven't decided if I'll buy some steel and relearn how to weld. Been a while. How hard could it be? Famous last words...

  5. #5
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    Re: Urbs New Build - Update #4

    Small update - Mounted the gantry to the base. Was a bit wobbly with just blocks to hold up the beam so I threw some tie straps around the ceiling. As mocked up I have about 5" of z height to work with. I'll probably go with 7" for the final design. Cut and added the cross members. Starting to look like something. The base and end plates will be next. That and ordering more screws. So many screws.

  6. #6
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    Re: Urbs New Build - Update #4

    A little here and a little there throughout the week. Placed some ply on the table surface which added rigidity throughout the whole frame. Ballscrews came in and I instantly learned how to reball the nut. Yeah spun it a bit too far in the wrong direction while testing with a drill. One is perfect, the other is usable. For the price I am not complaining. I finalized the gantry walls which I cut using baltic birch. At this point I don't see a need to buy aluminum plate but that may change when I do actual cutting whenever that may be. This weekend I plan to make some brackets out of 3" x 1" x 3/16" aluminum angle for the ballscrew and cut some end caps so the bearing don't fall off the table. I just don't feel like packing any more ball bearings right now.

  7. #7
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    Re: Urbs New Build - #6 because I can't count - End plates

    Cut the rear end plates that support the steppers. The cavity is for grease nipple clearance. Wouldn't be the first time I have crashed the gandry into the end plates. The ball screw bearing block mounts are 3/16" aluminum angle. The pictures clearly show why I need a cnc. My precision and accuracy with hand tools is awful. The "bad" ballscrew seems to work much better mounted in machine. Just a little vibration at 1000rpm which is faster than I will run with my motors. At this point I think I'll just buy steel channel workstation legs. Getting going on welding would be my first choice but time and budget are limited. Waiting on screws and motivation to do more.

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