I’ve read of people upgrading their rail system - notably adding a second rod to each Y rail, to prevent the carriage from twisting.
I’ve also tried to make upgrades to my emblaser by adding air assist using 3D printing, and found my cheap 3D printer to be unsatisfactory for the task. I’ve also noticed the ‘straps’ that hold the bearings in place have broken, and every now and then a job has to be aborted because of a problem with the carriages.
So I’m thinking of replacing the carriages (initially the left and right carriages, stretch goal - the laser carriage) with laser-cut MDF box carriages, and at the same time adding an additional rod to the Y rail.
I’ve got a suite of Python (2.7, ugh, I know) code for Inkscape that helps me design sturdy, tight-fitting box-like structures out of laser cut material. And I’ve just started adding a section to deal with making the upgraded carriages.
I’m going to base my design on the 3d printed ones here:
Although mine will have none of the graceful curves of this print, it will instead all be 90 degree joins and box-like parts.
Some things that I’m not sure about, having not worked with bearings before:
there are 3 ‘sections’ to the bearings. I noticed that the voids in the 3d print tend to “grip” the centre section and leave the outer rings not touching anything. Is this necessary?
the lower rod from the X axis passes into the Y carriage and rests against the bearing. Is this just a simple way of making sure that it lines up correctly?
the post above links to an ebay store where the bearings can be bought. Does anyone know where I can get the extra rods, and their dimensions?
Finally, I’m getting a lot of the dimensions for the parts - the distance between X rods, distance into the carriage, rod diameter, etc, from using a measure tool on these STLs. I can get my calipers out when I get home and confirm some of them by hand, as well. But are they listed anywhere?