### 4th Axis Tangential cutter for MPCNC
*IN DEVELOPMENT*
*Designs and software likely to undergo updates. Please check back.*
#### Recent
...Zeig mehr updates
25/11:
- Published update to gcodetools: manual path selection. Gcode cut order will match path selection order. See github link and manual_path_selection branch. Will merge once I've implemented optionality.
- Printed out geodave's blade holder, and very happy with it. See below.
Older:
- Moved gcodetools to Github.
- Shifted to degrees for the turn magnitude, firmware changes required
- Added support for full command by command speed control in the generated gcode
- Switched away from the pineapple, and adopted a metal 5mm to 8mm coupler
- No more thread moving inside the skate bearings - fashioned a smooth rod threaded at one end and clamped straight into the thread coupler - no top bolt, spring tension controlled by adding or removing washers. Not a critical update, more to follow.
See below for details
#### Further planned changes
Redesign blade holder - this one is too far from the tool mount. I will probably do something like the [TOCK](https://www.thingiverse.com/thing:1436870), where Olfa blade snap offs are used. Hopefully the rigidity of the cutting head can be improved.
^ Scratch this. Geodave did it better than I could have https://www.thingiverse.com/thing:2661474
Inter-changeable pen mount - some cut out jobs benefit from markings, like using Fusion 360 Slicer.
Instructable detailing workflow for going from Fusion 360 Slicer output to useable gcode.
#### Intro
Like a drag knife, only able to cut more intricate designs and sharp corners. Also more suitable for thicker material. May be adapted for other tools which require 4th axis (A axis) rotation, and also for other CNC machines.
https://www.youtube.com/watch?v=UMdeTK2p5F0
https://www.youtube.com/watch?v=cap5BHarNFA
Latest vid, working quite well now for thick (7mm) cardboard:
https://www.youtube.com/watch?time_continue=2&v=Y-hkMQuFu2w
#### Hardware
Design changes incorporated:
- Stepper motor to rotate the blade
- Rotating assembly free to slide on two steel rods mounted to the MPCNC via linear bearings - allows rotation without losing the spring loaded z
- Offset of blade tip to centre axis reduced to 0mm
In addition to the printed parts, you will need:
- 2 x 608ZZ skate bearings
- 2 x LMK10UU linear bearing
- 2 x 10mm x 120mm steel or aluminium rods
- 1 x Nema 17 stepper motor
- 4 x M3 x 8 screws
- 3 x M4 x 20 screws with nut
- 2 x M3 x 15 screws with nut
- 1 x M8 x 70 screw with lock nut, or M8 threaded rod cut to length
- 15mm x 20mm spring (took mine from a £1 caulk gun)
- 1 x standard utility knife blade
Optional:
5mm to 8mm metal shaft coupler (to replace pineapple, £1.50 each in UK)
#### Gcode Generation
A modified version of Gcodetools is supplied. Please note, this is no longer included in the Thingiv
