Hello! I’m a junior high student and this is my arduino project. This is an instruction about modifying proxxon mf-70 from full manual into semi-automatic. If you’re interested, please watch the video!

Video:

Step 1: Control Board-1

Material

Aluminum (100x80x1mm)
Wood board (120x200x12mm)
Push switch

Tools

Chisel (12, 30mm)
Handsaw
Jigsaw
Drill

Method

Aluminum board

Draw mark for inserting the push switches
Drill hole that fits the push switches

Wood board

Use hand saw to cut the wood board into the size of
Draw lines for inserting the aluminum board and LCD screen
Use jig saw to saw out the lines
Use 30mm chisel to make the side smoother
Use 12mm chisel to cut out notch that can fit the LCD screen (like the picture above)
Use 12mm chisel to cut out a slope at the edge of the LCD screen area (like the third picture above)

Step 2: Control Board-2

Material

Led(Red and Green)
LCD board https://www.amazon.com/SunFounder-Serial-Module-D...
Screw m3
Keypad (4x4) https://www.amazon.com/Matrix-Membrane-Switch-Key...

Tools

The same
Screwdriver

Method

Aluminum board

Drill two more holes to place in the LEDs
Insert it by placing it inside if it fits and not loosely or glue it on the wood

LCD screen

Place the LCD board in the wood board
Screw (like the picture above)

Key pad

Drill holes in a line on the area that the wire has to go through
Use 12mm chisel to make it square
Make the wire go through the back of the wood board
Wrap off the white layer of the key pad
Stick it on the wood board

Step 3: Control Board-3

Material

Arduino Nano
Jump wires
Breadboard
Computer (downloaded Arduino)

Method

picture above

Circuit

Picture above
LCD i2c (SDA-A4)black
LCD i2c (SCL-A5)blue
LCD i2c (VCC-5v+)red
LCD i2c (GND-GND)black
Push switch1 (the right one above the green LED-D13)green
Push switch2 (the one at the left of this one↑-D11)Red
Red LED (connect with the push switch2)
Green LED (connect with the 5v+)
Keypad (connect from D10 to D3)

Program

https://create.arduino.cc/editor/aiden_hsu/908a7d8...

Step 4: Proxxon Micro Mill — Material

Material (for each axis)

Thrust bearing x1 https://goods.ruten.com.tw/item/show?217422420585...
Bearing adapter x1 (Pre-processing)
Diameter 2mm axle x1
Axle adapter 4.5-5mm x1
Stepper motor x1 https://goods.ruten.com.tw/item/show?214051710720...
Stepper motor adapter x1 (Pre-processing)
m3 screw x3
Copper pillar x3
M3 Spacer x3

Tool

Hex key (
Vernier scale

Step 5: Pre-processing

Method

Stepper motor adapter (for x and y axis)

Combine two cut 3mm acrylic board (design page dxf(1))

Disassemble the handle (x and y axis will be mostly the same)

Unscrew the screw
Remove the dial scale (there’s a small pin will pop out)
Use a 1.9mm pin and a hammer to knock the pin for connecting the handle out
Remove the black plate (pic 7)
Drill three holes on it for connecting stepper motor (only for z axis)

Cutting the stepper motor axle (the shortened length will be different for x, y, z axis)

Measure the length of the axle that has to be shortened (Mark it with marker)
Use tape to protect the motor from the dust
Use grinding wheel to cut the axle (wear gloves)

Cutting the copper pillar

Measure the length of the copper pillar that has to be shortened (Mark it with marker)
Use grinding wheel to cut the copper pillar (wear gloves)

Thrust bearing adapter (design page 3dm(1))

Use CNC to mill aluminum to form the shape
Mill a trench for fitting a 2mm pin (2mm mill head)

Step 6: X-axis

Method

Screw the copper pillar on the stepper motor(do not screw it too hard)
Screw the stepper motor adapter onto the three copper pillar with 3 m3 screws (the screws might have to be cut shorter to fit)
Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
Insert the thread bearing onto the bearing adapter
Screw the stepper motor adapter on the mill with two m3 screw
Screw the axle adapter on the mill axle

Step 7: Y-axis

Method

Screw the copper pillar on the stepper motor(do not screw it too hard)
Screw the stepper motor adapter onto the three copper pillar with 3 m3 screws (the screws might have to be cut shorter to fit)
Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
Insert the thread bearing onto the bearing adapter
Screw the stepper motor adapter on the mill with two m3 screw
Screw the axle adapter on the mill axle

Step 8: Z-axis

Method

Screw the copper pillar on the stepper motor(do not screw it too hard)
Screw the copper pillar on the black plate
Insert the thread bearing onto the bearing adapter
Screw the axle adapter on the stepper motor axle (make sure it’s screwed on the flat surface of the shape axle)
Screw/unscrew the hex nut on the z-axis thread in order to adjust the position of the hex nut (Before the black plate was screwed on the mill
Screw the black plate on the mill
Soldering the stepper motor 4 line wire (If the order is incorrect)