Do you know how to create lead nut ?
DIY lead nut ?
I saw cylinder nut, but not sure it will stay there even I clamp and glue it...
any ideas ?
thanks a lot
I created prototype with balsa wood, hex nut and hot glue, as in the photo...
I can make a clamp with nail screw on it..so the hex screw will be anchored into the plate
Any more ideas ?
any ideas on how to drill the screw so I can attach the shaft of my stepper motor ?
special drill bit ?
You need to look into couplings to connect your motors to your shafts. There are many varieties, each with their own advantages and disadvantages. They range from a small (1" or so) piece of flexible tubing clamped on each shaft to precision couplings that may run MANY dollars.
Many are available that will connect differing sized shafts conveniently.
I'd suggest looking at some of the common CNC suppliers mentioned on here such as CNCRouterParts.com or HobbyCNC.com for your hardware needs. You'll find there's many, many ways to do things.
I don't think using a steel nut is a leadnut is a good idea. There will be a lot of backlash that will continually get worse as the metal on metal causes wear. You can make leadnuts from cheap HDPE if you have access to a tap. You can even make a tap from a spare piece of threaded rod or you can use the melting technique to make leadnuts.
If you must use a steel nut you won't need any glue. You can drill a hole slightly smaller than the external nut size and screw the nut into the wood. Use a large washer on the other side to prevent both sides from embedding into the hole.
Hope that makes sense.
A search for "lovejoy couplers" on google images returns many good examples