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 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.
I’m closing in on the design for the different parts of the coiling machine. Today I worked out the left home limit switch assembly, and glued up what I hope to be the final iteration of the carriage and carriage mount assemblies.
I took the back panel off the carriage slide mount because it just wasn’t necessary, and the delrin rods wouldn’t stay glued into their slots. I moved the enamel wire slot up, to accommodate another change to the carriage: I added the pulley to the front of the carriage assembly, eliminating the need for an additional assembly and simplifying the design. I also drilled the hole for enamel wire to feed through the delrin block. Lots of tweaks and small iterative changes happened.
Last night I had some time on the lathe and made a new 8mm-5mm coupler because my first one was just stupid big. I also made two rod caps with set screws to hold the end of the steel rod in the carriage mount. I still need two more of them, as well as two more for a smaller rod in the pulley mechanism.
You can also see where I cut a rectangle out of the carriage mount front and back, and CA-glued in 1/4″ delrin rod to protect the enamel wire as it feeds through. Next step is to figure out how I’m mounting the limit switches to control back-and-forth motion, then it’s assembly time!