Mini CNC
Description
This is a mini CNC machine that uses Dremel rotary tool. It is assembled from Mini CNC and Electronics & Motors subsets of Contraptor.
- Axis travel:
- X (left-right): 6" or ~15cm
- Y (front-back): 8" or ~20cm
- Z (up-down): 2" or ~5cm
- Feedrate
- 15 IPM or ~6 mm/s (all-thread rods with flywheels)
- 10 IPM or ~4 mm/s (all-thread rods w/o flywheels)
- Accuracy: estimated 0.01" or ~ 0.25mm
- Assembly time: 6-8 hrs
Issues
- Higher feedrates (20 IPM) are unreliable
- Needs vacuum system for removal of chips/swarf
Firmware
Arduino GCode Interpreter
Source Files
Build Logs
- http://www.contraptor.org/forum/t-192541/mini-cnc-case-study
- http://www.flickr.com/photos/mantao05/sets/72157623378696709/
- http://www.contraptor.org/forum/t-234948/mini-cnc-build-log
More pics
In action
Fabricating a wheel from 3/8" HDPE cutting board (left) and making pockets in UHMWPE (right)
Test-routing a PCB in hardboard (speed 12x)
Component list
| components | qty |
|---|---|
| angle-1 | 6 |
| angle-2 | 14 |
| angle-3 | 8 |
| angle-4 | 11 |
| angle-6 | 4 |
| angle-9 | 2 |
| angle-12 | 6 |
| angle-18 | 6 |
| coupling-nut-clamp | 4 |
| leadnut-mount | 4 |
| linear-bearing-2.5 | 4 |
| linear-bearing-3.5 | 2 |
| linear-rail-12 | 2 |
| linear-rail-18 | 2 |
| motor-mount-nema23 | 3 |
| shaft-mount | 8 |
| sliding-element-1 | 2 |
| sliding-element-2.5 | 2 |
| dremel-mount | 1 |
| parts | qty |
|---|---|
| XL240 belt | 1 |
| pulley-XL10T | 2 |
| bearing #R188-2RS | 8 |
| bearing #R3-2RS | 16 |
| thrust-bearing #6655K13 | 2 |
| motor-coupling-set | 3 |
| nut 1/4 | 24 |
| washer 1/4 | 4 |
| spring-washer 1/4 | 10 |
| screw 1/4 1L | 4 |
| square-nut 1/4 | 12 |
| threaded-rod-13 | 1 |
| threaded-rod-14.5 | 1 |
| threaded-rod-15.5 | 1 |
| threaded-rod-21 | 1 |
| screw 10-24 3/8L | |
| screw 10-24 1/2L | |
| screw 10-24 3/4L | |
| nut 10-24 |
| custom items | qty |
|---|---|
| acrylic table 6x8 | 1 |
Assembly
Tools
The following tools are recommended to assemble mini CNC (list may be incomplete):
- Hex or Allen keys (imperial from 1/16" to 1/8")
- Combination wrench (imperial 3/8" and 7/16")
- Hex socket (imperial 3/8")
- Needle nose pliers
- Screwdriver (phillips)
- Small screwdriver (flat)
- Try square or equivalent tool
- Measuring tape
Color coding
The following color coding is used to visualize which angle lengths are used and where:
- angle-1: Red [255,0,0]
- angle-2: Green (Lime) [0,255,0]
- angle-3: Blue [0,0,255]
- angle-4: Cyan (Aqua) [0,255,255]
- angle-6: Magenta [255,0,255]
- angle-9: Yellow [255,255,0]
- angle-12: Maroon [127,0,0]
- angle-18: Green [0,127,0]
- angle-24: Navy [0,0,127]
Base
TODO: add text
Y-axis
TODO: add text
X-axis
TODO: add text
Z-axis
TODO: add text
Bill of materials
Todo
page_revision: 48, last_edited: 1282502291|%e %b %Y, %H:%M %Z (%O ago)
