Well that didn’t take long. After assembling all the parts and checking alignment, attaching the GT2 belt, tapping the spool holder end stop for a set screw, and cutting out two small neoprene washers to hold the spool, it was time to evaluate where the electronics will go.
I played around with the parts (mainly an Arduino Uno, a custom stepper controller board, and a 12v power supply), and found a layout that made me happy. I drew up some CAD plans for the Arduino Uno mounting holes, the stepper board holes, and the MeanWell 12v power supply and added them to my base CAD drawing. I also added feet at each corner, and also drew up a custom assembly to hold the C14 power socket and switch. Then I added holes to route wires underneath the board. Then I cut everything out (except for the power assembly) and checked the fit of the feet. Looking good!
So to say the least, last night was extremely productive. I plan on making some small standoffs for the Arduino mount, and maybe a thin-gauge metal plate for the power assembly to fit into. The final bit I haven’t drawn up is the OLED that will mount on the front of the idler assembly, which will be quick but require a new idler set to be cut out.
All that said, I expect to be testing electronics and writing code very soon.
…and hopefully the final version, but only time will tell. I cut it out last night and fit all the parts. Behold!
As you can see, I’ve marked where the belt will attach to the carriage, and haven’t attached the limit switch to the adjustable right-hand stop yet. I also haven’t made the other end of the spool holder yet. I’m also considering changing the 8mm shaft on the solenoid spool holder to the full size of the central spool hole, but I’m not sure that’s necessary yet. It would also mean making another new shaft coupler.
After the spool holder and carriage belt mount, the next step is to add the electronics and I’ll be up and running!
Last night I took all the coiler parts out and estimated distances between each of them. I arranged a new CAD file with the cutouts in their proper places. Today is Pi Day, and there’s a celebration at the makerspace so I don’t know if I’ll get to cut the base out, but it will happen this week, and if everything looks good the carriage motor and idler assembly will have the belt cut for them and the carriage will have attachment points for the belt before the end of the week.
I finalized the idler plans, measured the height of the carriage motor at the belt location and used my idler parts thickness to decide the full height of the idler assembly. A quick cut out with the laser cutter and an overnight glue job yielded a final part. Lastly, I took a picture of (almost) all the coiler parts together. Not appearing in the picture are the electronics and the magnet wire spool holder assembly.
The CAD for the idler parts is not the final version, I dropped the curved top but you get the idea.
I did some more work last night, made pieces to finish the idler and the pulley bar caps. Here are some pictures of the parts and assemblies in action.
I started work on the idler for the non-drive side of the GT2 belt that will move the carriage back and forth. I have a delrin part to make for it (the center piece), and the wooden stand too. I didn’t have much time tonight though, so I only got a little done.
That being said, I did find the time during a meeting to swap the stepper motor off the old carriage drive assembly and on to the new one I cut out and glued yesterday. No picture of that yet.
I had a little time this evening and used it to check assembly heights. I realized that I needed to lift the carriage motor mount up about an inch for the GT2 belt to attach to it. I made a few small changes to the design as well. Here’s the new part layout:
I also drew up a template for the slingshots. Something simple that will help me locate the holes I need to drill out. I’m not quite there yet, but I’ve been itching to get it drawn and cut out.
My next step in to create an idler mechanism and support assembly for the other end of the belt. I need to use the lathe to make the actual idler and a small delrin tube, and also draw up plans for the assembly to bring the idler to the right height.