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Single 1/4" Coupling Hub
$4.00
Introduction:

This hub can be fastened to a 1/4" motor shaft or a 1/4" lead screw.

Description:

Note: To create a complete coupling set, you will need two hubs (one for the motor shaft and one for the lead screw end) and you will need one spider. These items are only offered to allow for any configurations that is not offered for rigid couplings.

Related Tutorials
DIY Coupling: A coupler for the motor and lead screw (from Marc K.)
This creative coupling solution comes from another generous user of the site. He has devised a way to couple the motor to the leadscrew with standard aluminum tubing. Marc has graciously allowed me to show you this creative idea.
CNC Panel Joinery from Make:
Here's a really useful article on CNC panel joinery methods by Make:. Most of the images show laser-cut pieces, but could definitely be adapted for use on a CNC router or machine. In some of the images, you'll notice there are sharp corners that would not be possible using a CNC machine. With a CNC machine, you would need to create overcuts to account for the thickness of the end mill. If you're having trouble figuring out how to fasten parts together in your designs, this article is definitely worth a look. Find the article here.
Technique to Minimize Backlash by Gérard C.
Getting rid of backlash seems to be the biggest concern for the CNC hobbyist, especially when milling PCBs since copper traces for surface mount devices are used. Surface mount devices are very small electronic parts that contain leads that are extremely close together, or the leads are found on the bottom of the component and the part usually lays flat on the PCB (Printed Circuit Board).