User:Wayland
Release status: Experimental
| Description | A new belt-drive repstrap loosely based on Darwin and the McWire Cartesian Bot
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The Golem is a work-in-progress RepStrap. It'll be big and cheap, as much as I can make it. It probably won't have a great print area for its size, but I don't need to keep this thing on a desk. Y axis runs on aluminum channel, X axis will run on steel rod, and z axis will be on threaded rod, with the print platform moving. I'm thinking about using pololu sepper drivers and the sanguino for a motherboard. For the extruder, I might use Adrian's geared extruder, if I can get someone to print the parts for me...
Current Progress: Z axis is nearly finished but for threaded rod and build platform; threaded rod has been obtained but needs to be cut
Contents
To Do List
(things will be listed as they are foreseen, stricken out when they are completed, and deleted when they are documented and photographed.
-
Cut and drill angle and channel for the z-axis -
Put z-axis legs together - Put in threaded rod
- Build a coupler for the stepper and the threaded rod
- Obtain timing pulleys and belt
- Build print platform
Parts
I have basically a scrapyard in my backyard, so a lot of these parts are salvaged. This is a prety cobbled-together thing, using whatever I have or can get cheaply
- Aluminum plate, channel, and angle - Salvaged, cut to size with circular saw, drilled with drill press
- 3 Stepper motors - Cheap surplus-store Molon steppers (these guys) - Almost no specifications, I will test them and figure out voltage and current once I get my power supply and drivers. They don't have a great resolution - I'm thinking I will gear them. If they're no good, I can always buy some NEMA 17s.
- 8 skate bearings - Salvaged from an old generic-brand skateboard. These are pretty nice bearings and perfect for what I have in mind. These are just for the y axis - I'm gonna need to find or buy some more for the carriage.
- Threaded rod - Salavaged
Y-Axis
I really liked the self-adjusting bearing arms used in the McWire Cartesian bot, so I made something similar; instead of using a platform, though, I'm using separate (for now) carts that will have the x-axis running between them. Each cart will be driven by a separate belt, both of which attach to the same stepper.
The cart is made of sheet aluminum , as are the bearing arms. The fixed bolts have on them: a spacer, the bearing arm, the bearing, and the nut. The floating bolts are just the arm, bearing and nut. There is a small hole on the inside of each bearing arm; I had planned to use springs like in the McWire, but I only had rubber bands around to test it with, which ended up working fine. If the rubber bands break, though, I'll switch. These carts run on a frame I made from aluminum channel.
Gallery
Salvaged skate bearings
More bearings
Aluminum channel frame
Frame with carts
