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Usually, in systems like you pictured above. Between the motor and the drive wheel is a tension-er pulley setup like on old reel-to-reel tape recording systems used to always keep the tape under tension. I’d copy what they’ve done there, because it works and prevents backlash of the tape(filament) in this case.
Hmmm, it would seem you would need to keep the filament under some kind of tension at all times to make sure it feeds (winds correctly around the spindle). Otherwise you run the risk of the filament not spooling correctly on the windings. I could see this possibly working if the motor was mounted on the top frame and at a 90 degree angle. That way in theory the filament could naturally made to be always under tension. You would need to add a pulley at the base of the drive wheel to affix it to the drive wheel.
My 2 cents!
Hi Robert,
I believe air bearings would be impractical. They are specifically designed to have almost no friction once up to pressure and since no contact is made but the air, there would be no way to prevent slip on the rod.
I went and used fiber board 3/4″ @ Homedepot and its cheap. It’s super stiff and does not flex at all, which will provide an excellent base for the X,Y, and Z axis. I’ll let you know how it works out.
If I remember correctly, one of the caveats to using fiber board is it tends to degrade over time, the binding glue begins to dry out if you don’t seal it up. I’m going to probably need to add primer and paint to it in order for the glue to hold up for a long time.
Here’s a link to the sketchup 8 plugin that imports DXF files.
https://sites.google.com/site/jimfoltz/my-sketchup-plugins/freedxf/freedfx-0.57.rbz?attredirects=0
I followed the install directions on this page.
https://sites.google.com/site/jimfoltz/my-sketchup-plugins/freedxf
If you use sketch up, there are free plugins that you can load to open up and view DXF files. Alternatively, you can use LibreCAD to open it up.
Also, a problem I discovered I had was to make sure you’re not downloading the individual files from the Git project using Firefox or whatever browser you use online. At least with Firefox, it will save a garbage file that you will not be able to open. You must download the entire project zip, then open the selected DXF file you want from the zip.
Thanks Quentin!
I’m getting my parts printed this coming week over here (http://uk-3d.com/) in the UK for £ 0.1 cm3. I’ll let you know how they turn out.
Things are starting to come together and I’m chaffing at the bit to start putting stuff together…
Mike
How long of GT2 timing belt do I need for both X/Y stepper wheels? I bought a 1100mm belt, will this be long enough for both?
Threaded rods are not as I understand it uniformly accurate with regards to the pitch of the screw where as lead screws more or less guarantee uniform pitch, diameter, etc… within a given tolerance range. That’s why they cost much more than a threaded rod.
Hi Quentin,
Could you contact me and tell me how much you would charge for sourcing the Morgan STL’s parts (8mm) through you?
