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Hi. I have not had that issue. The bearings sits nicely on the u-bolts. It is of course important to align them properly before tightening the assembly. I guess it could be caused by the u-bolt not being totally perpendicular to the tubing. I could imagine that if one of the u-bolts was misaligned, it could result in what you describe.
Hi!I can only offer you the help given in the instructable. Everything you need to know, should be there. I cannot offer you personal support in the entire process of building and configuring the machine.Best regards,Mogens
Good to hear! I have paid for Lazycam some years ago, so that is what I use for simple tasks. There is also something like Camotics and a bunch of other open source CAM solutions that I have not yet tried to work with. At the moment I don't have a CNC (I sold it a year ago or so), so I am not up to date on the newest open source CAM software out there.Best regards,Mogens
Hi, I do not have a diagram. But just Google "grbl wiring ". There are many examples to find, and they are all similar.
Thanks. I guess 10mm would be a bit much. But maybe it could be achieved with a good spindle and the right settings.
If you wan't to buy it, kits are available at www.ustepper.com If you wan't to build it yourself, you just have to get the parts listed in the instructable. The highest cost is the stepper and drivers.
Thank you for the nice words. I can see the problem with the imperical vs metric units in the US. The grooves I just made with a table saw, and yes, the aluminum angle is held in the groove by the pressure from the u-bolt and bearing. The pipe wall thickness is around 2.65 mm. The gantry does weigh a bit, so I don't think you should go much further down in tube dimension. You might risk that it will bend a bit on the middle if the dimension gets to small.Best regards,Mogens
Thnak you for the nice words. I can see the problem with the imperical vs metric units in the US. The grooves I just made with a table saw, and yes, the aluminum angle is held in the groove by the pressure from the u-bolt and bearing. The pipe wall thickness is around 2.65 mm. The gantry does weigh a bit, so I don't think you should go much further down in tube dimension. You might risk that it will bend a bit on the middle if the dimension gets to small.Best regards,Mogens
Thank you for the nice words!
Hi!Thanks for the kind words. I have just checked the link again, and it is still pointing to a nut cover (item number 25 on my list).
Thanks for the kind words. Your machine also looks nice - a bit bigger though :)
Hi,Yes, you could use any other stepper driver solution out there, be it GRBL shields, 3D printer controllers etc. Of course the sketch I wrote was done for the uStepper, but the principles would be the same as long as you have feedback. If you don't have feedback, then you will have to run it open loop (like a 3D printer og GRBL machine does).
Hi Thanks for the kind words! No the uStepper boards actually copes very well with the heat generated by the driver chip. This is due to the design of the board, which has large ground planes (also internal) that takes the heat. If loaded excessive over longer periods, one might have to add some cooling - but I haven't had any issues so far.
Hi!Thanks for the comment - totally forgot the rods... I have just added them :)
Thank you for the kind words!
Robot Arm - UStepperView Instructable »
Thanks for the kind words and the vote! Appreciate it!
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Strange! I got the same error... I read on the Fusion forums that some versions had a flaw that causes this - and that I could try saving it with the newest Fusion release. I have just done that, and now it works once again!
Hi! I simply chose MDF because it was cheapest and it is easy to work with. I have done another machine in plywood, and that also works fine. The plywood is more sturdy, but this machine does not require it.
I buy bearings at reprapworld.com They are not that costly. But ebay may be cheaper!
Yep. There are 6 alu angle pieces with 4 bearings each = 24. Then there is 8 u-bolts with one bearing each = 8. And finally there is a bearing in each end of the threaded rod used for lead screw = 6. So all in all 38 :)
Yes that is correct. I use 3 limit switches, or microswitches - so 1 per axis :)
That shield should work just fine!
Hi! Yes it should work with any grbl shield having at least 3 drivers. I just found the cheapest on ebay. But that may also be why I had to modify it a bit. It wasn't an issue for me though...
No problem! I can see now, that of course not everyone is familiar with Fusion 360... I look forward to see your result!Best regards,Mogens
I have just added drawings showing the MDF parts with measurements. Hope that helps!
I paid around 200 USD in parts for this machine. That includes everything, also the dremel (not a genuine dremel), controller and PSU.
No, why should it be that? Based on the parts I have done with it, I have gotten an accuracy that is at least 1mm.
Hi, The idea is that you should be able to build it yourself quite easily. It is not available for purchase :)
Hi,You should open the file in the provided link in fusion 360 (step 2). In there you can measure everything out :)Question 2 I don't understand?Software is just plain GRBL, and settings is shown in Step 4. There is not much programming to it.
Hi! I can't see any problem in just extending the different axes according to your needs. So just extend the tubes, threaded rods and MDF parts :)
Hi!The bearings are not attached to the u-bolts. But they stay where they are, since the u-bolts sits tight against the pipes. The bearings are unable to move to the sides when everything is tightened.The alignment has not been a problem - everything runs smooth. I have built 10 of these machines in the current design revision, to ensure that the design was okay. Essentially it all comes down to how much effort is put into building the machine (ensuring that all measurements are kept within a small margin). The machine design here is a bit forgiving though. The MDF is a bit soft, so some of the misalignment will be removed through this.
Yeah, it's incredible how much power you can get for almost nothing these days. I would hesitate a bit if I had to use gate logic for controlling a machine like this! It's really great that so many put so much effort in the open source GRBL firmware for these small microprocessors.
Thanks! - I have 1.25mm/rev on an M8 threaded rod, 200 steps is one revolution on a full step stepper, I use 1/16 microstepping giving: 200*16/1.25 = 2560 steps/mm
Hi again! Just got a friend of mine to open the STEP file in Rhinoceros, and it opened up fine. It's a bit heavy, but that's because it's a combined model. But if you have trouble, try out Fusion 360. Unfortunately I don't know any with a SolidWorks licens, so could not try that one out for you.
Hi! Thanks for the support!You can use something called img2gcode (google it), for converting an image to gcode. It has some settings enabling you to cut out the dark areas.The machine should be able to handle a reasonable size trim router. If the machine gets wobbly, you may have to offer some speed. But I believe a larger tool than a dremel can be used without causing to much of an issue.
Hi! I am not the creator of this Robot Arm design. Unfortunately I can't remember where I got it from, since it's maybe 9-10 years since I found it. I have a dxf file that I once downloaded. It was open source, but I can't give credit to the creator for the reason just stated.
Hi! I did some routing in 1mm aluminium. The important thing is to get the right spindle rpm and the right bit. The threaded rod is just regular 8mm from the hardware store. Best regards, Mogens
Hi!I have just added a couple of fotos, showing what the machine can do. Unfortunately the machine is sold, so I can't even make new examples to show. But I have been doing engraving in MDF, which it also did very well - just don't have any pictures of it.
Low Budget CNCView Instructable »
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