I am building a fixed gantry style CNC router. This router will have 15mm linear rails and 16mm ball-screws on the X and Y axis, the Z axis will be a unit I adapt from another machine. I should have a cutting area of 380mm X 500mm. I will use openbuilds motors, electronics and software for the control.
I have modeled most of this build in fusion 360, however I am still making decisions and reworking things as I go.
With lots of plates to cut out I have worked out the following technique. I hold down stock with clamps and bore my holes with an 1/8" single flute endmill. Once I have holes I use screws to attach the plate to the waste-board so I can do any contour operations with a 1/4 endmill. Once I am done with the contour cuts I add a chamfer and do any 2-sided work using a shallow pocket in the waste-board if necessary.
The motor for the Y axis will sit under the moving bed, I have mounted it with a pulley and belt to reduce the footprint of the machine.
The gantry is made from 3 25x75mm al extrusions these are bolted together and supported with endplates.
The x axis ball screw is mounted to the gantry with custom spacers.
Here are a few photos from milling the ball screw spacers.
I am reusing a z-axis from another machine, it does not mount directly on rails so I have made an adaptor plate to make it work. I started out by 3d printing a few test pieces to get the hole spacing and mounting height correct. The adaptor plate is made from 5/16 or 8mm plate.
For the bed I have a piece of 3/8 cast plate. So far all I have done with it is to cut it to the rough size. I will be cutting some mounting holes in it soon...
Fixed Gantry CNC Router
A fixed gantry router using OpenBuilds control and electronics.
- Build License:
- CC - Attribution - CC BY
Reason for this BuildI am building this machine to gain experience and see what type of accuracy I can achieve from a DIY router.
Inspired byC-Beam by OpenBuilds, Modesty by linmag, C-Beam Machine Too by Metalguru