Rotary 4th Axis
by BoilerPlateDan, published
A simple 4th axis for lightweight CNC and 3D printing applications (go on, someone wants to try printing using a 4th axis). Designed to use a NEMA 23 stepper
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Makes use of a NEMA 23 motor, but edit to suit. I've fitted a face plate to mine; it is up to you what you stick on the spindle end
I built this for my CNC machine to allow full 3D objects to be machined. Generally its constructed from 6mm MDF glued together to form a frame. I've uploaded an alternative version for those who can print the frame out. I suggest that you take off the top plate if printing.
To make this you'll need 1x Frame (up to you how you make it) 4x Rotary Table Bearing Housings 1x Rotary Table Motor Mount
and 4x 8x22x7 Bearings 1x Rotary Table Layshaft (8mm rod) 1x Rotary Table Spindle (8mm rod) 2x T5x10 10 tooth gears 2x T5x10 40 tooth gears 1x NEMA 23 Stepper 1x Rotary Table Spindle Spacer 12x M4x22 bolts 4x M4x12 bolts 4x M4x26 bolts 20x 4mm Washers 16x M4 nuts
This doesn't really need instructions- just follow the jpeg and you'll be alright. You'l have to make up various spacers along the way- I used 10mm tube with a 1mm wall.