Skip to content

8. Embedded programming

from last week

Note

Hamamatsu CNC is using the 1 flute straight bit (Tool_dia: 6mm, Shank_dia: 12mm) by default.
Learn about Up cut and Down cut endmill from the Tip CNC tool

Sunshine Protection Act in US

article

  • 2023 Autum -> never change the time
  • FA2024 22:00-1:00

Preparation for next week

Molding and Casting
group assignment:
review the safety data sheets for each of your molding and casting materials,
then make and compare test casts with each of them
individual assignment:
design a mold around the stock and tooling that you’ll be using,
mill it (rough cut + (at least) three-axis finish cut),
and use it to cast parts

Assessment

Assessment

FAQ

What does 3-axis milling mean?
Answer: You should have smooth tilted or curved surfaces instead of
“steps” towards axis Z.

some flat surfaces and depth -> X

Material ans Machine

  • Machinable wax
    • size: 152mm x 92mm x 39mm (real size is smaller)
  • Machines
    • Genmitsu PROVerXL
      • work area: 400mm × 300mm × 110mm
    • MDX-15
      • work area: 152.4mm × 101.6mm × 60.5mm
  • Endmill
    • 0.1250” DIA 4FL SE LONG AlTiN 1/8
      • Tool_dia: 1/8” =3.175mm
      • OverAll Length: 2-1/4”(2.25”) =57.15mm
      • Rough cut
    • 0.0625” DIA 2FL SE AlTiN 1/16
      • Tool_dia: 1/16” =1.5875mm
      • OverAll Length: 1-1/2”(1.5”) =38.1mm
      • Finish cut
  • Design to think…
    • XY size: real wax size
      • Final Part size < wax size - wax_wallx2 - mold_wallx2
      • distance between bumps凸 & dents凹: tool size > 1.58mm(1/16”) > 0.79mm(1/32”)
    • Z depth: 1.5 in mill > 38.1 -　10mm?_in_collet
    • Registration Key, Registration post
  • Process
    • 3D modeling
      • Fusion360
    • Tool Path
      • Genmitsu PROVerXL
        • mods?/FusionCAM?
        • gSender?/jscut?
      • MDX-15
        • Modela Player4 (Windows)
        • Virtual Modela (Windows)
  • Casting materials
    • Silicone rubber (mold)
      • Mold Star 31T
    • Urethanes resin (final part)
      • Smooth-Cast 320
        • color: Off white
      • So-strong
        • Color Tints for Urethane
    • Ref. last year
    • Low melting point alloy (final part)
      • 138 C
    • Tin (final part)
      • 231.9 C

Preparation

  • 3D modeling
    • sample
    • design final part (positive)
    • design molds to make final part (negative)
    • design wax to make molds (positive)
    • Add pouring and vent ways
  • make (next week)
    • mill wax for 2-3 hours
    • pour liquid silicone rubber into wax to cast molds (negative)
    • pour liquid resin into molds to cast final part (positive)

Group Assignment

compare the performance and development workflows for other architectures

Todo

  • Seeduino Xiao
    • ARM
      • Atmel SAMD21
  • Seeduino Xiao RP2040
    • ARM
      • RP2040
  • Raspberry Pi 4/3
    • ARM
      • Broadcom BCM2711/BCM2837
  • Microbit v1
    • ARM
      • Nordic nR51822
  • Raspberry Pi pico
    • ARM
      • RP2040
  • Arduino UNO
    • AVR
  • ESP32
    • Espresoif

Ref. last year

individual assignment:

read the data sheet for your microcontroller
use your programmer to program your board to do something
extra credit: try other programming languages and development environments

Attention

resistor[ruh_zi_str] : electrical component that implements electrical resistance
register[reh_juh_str] : a memory location within the actual processor that work at very fast speeds

Note

Easier procedure to burn bootloader into USB-D11C-serial board
USB-D11C-serial (Arduino IDE + Xiao)

ToDo

Read/browse one of the data sheets

Document what you learn form one/two of the topics

Program your 1614/3216 board from USB-SAMD11C-Serial board via UPDI interface

Arduino Sketch

  • Press Button and LEDs blink
  • Echo in Serial monitor
  • Flash sound

Arduino with register_bit

Arduino in C

Last update: March 24, 2022