by cgapeart, published
Updated to make the SCAD/MCAD Library usage more standard.
Now with Customizer Support!
Added cutouts for the motor mounts, and cleaned up a few spots. Also, started work on a 2d projection for export to dxf for making diagrams for actually building it.
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Well, I tried, but no luck. It doesn't create anything that is compatible with STL - something about it not being 2-manifold.
The updated version has the layout for making a DXF, for most of the parts, but its still a work in progress.
Freecad looks interesting, but I am really struggling with the UI still. Any tutorials you would recommend to get me past the initial learning curve? I need something the explains some of the ideas about how it works behind the scenes.
Sure thing. When I upload it next, I will include an alternate format - but STL isn't really the right format for this here, unless I break it down into seperate parts. I have also been working on adding a 2-d projection that I can export to DXF format so I can use a cad program to dimension the drawings for actual construction
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This is an early design, and has not been built yet. I want to post it early to make it easy to share with friends and I am opening seeking comments from people who have built something like this and might be able to see some pitfalls a newbie would miss.
The OpenSCAD file is fully parameterized, to easily adjust the dimensions of the final machine. The default values I am working with create a working volume of appoximatley 10.5 inches wide, 17 inches long, and 6.5 inches high. I also have it set up the design to 'control' the device so that it is easy to visually observe the range of movement and check for areas where parts might collide.
The design is missing any kind of end-stop at the moment, and I haven't drafted in the connections between the drive rods and the axes.
The main construction material is 3/4" MDF. The current plans are based on the lumber being actually 3/4" - I haven't adjusted that for the actual dimensions yet, but thanks to OpenSCAD, that is just one variable (BaseBoardThickness) to change.
The bearings are 608 rollerblade bearings, and the motors are set as NEMA14's. I am planning on using 8mm ACME threaded leadscrews if I can get them, otherwise I will go with standard 8mm metric threaded rods.
My biggest worry so far is that I built in routed out shapes on each of the axes to make is easy to keep the drive rod in close to the axis of movement and keep the off-axis torque down. Will the wood still be strong enough? I am hoping that the slots for the T-Slot rails can be cut into the machine mostly by itself.
An Arduino with any one of the available drive software packages and motor drivers will be used to control it.
The MCAD Motors library is required for the stepper motor. The library set is available from github.com/elmom/MCAD . You can adjust the path in the include statement at the top of the file based on where you install it.
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