/ GROUP-WORK

Electronics Production

Hay Guys! We gotta participate in a group project before you go anywhere.

Electronics Production

Result Value

Type of endmill 0.4mm 0.8mm
Feed Rate (mm/min) 180.00 360.00
Plunge Rate (mm/min) 30.00 50.00
Spindle Speed (rpm) 12000 12000
Stepover (%) 15.00 15.00
Pass Depth (mm) 0.05 0.15
Clearance (mm) 0.8 N/A
  • Minimum Trace Size - 0.35mm (It remained at 0.1 mm, but was clean at least 0.35 mm.)
  • Minimum Clearance Size - 0.4mm
  • Minimum Hole Size - 0.8mm

    • Characterize the design rules for your PCB production process

    We chose trace width jpg files in schedule web page.

    Design rules

    Design illustrator (divide into three steps 1.engraving 2.make hole 3.cutout)
    image trace - expand - ungroup - remove the parts to be left - save design files as svg

    PCB production process

    Measure circuit board. (hight, width, thickness)
    Wash circuit board with water.

    Open windows in machine.
    Clean workstation in machine with scraper.
    Attach double-side tape to the circuit board back side.

    Attach the circuit board to the workstation.

    Change to the endmill we use.
    Close windows in machine.
    Configure the changed tool in program.
    Set board material, size, placement.

    Open files to be cut.
    Set files placement, scale, parts to mill, engraving depth, milling tools.

    Proceed in two step engraving and cutout.




    Tools should be changed if different types of work are done. (ex. engraving and cutout)

    Clean it with a vacuum at the end of each task.
    Wash completed circuit board with water.
    Our result of the group assignment.

    What we learned from the group test

    Because our group result was not clearly made, explained other board.
    What do you think is the smallest safe trace size to use?
    0.008
    How much space should you leave between traces?
    0.016

    Add test file cut in week 6

    We had one more test about the minimum trace size & clearance as well as through hole size. (in mm) We used 0.4mm, 0.8mm of end mill on the Bantam.

  • Minimum Trace Size - 0.35mm (It remained at 0.1 mm, but was clean at least 0.35 mm.)
  • Minimum Clearance Size - 0.4mm
  • Minimum Hole Size - 0.8mm

    • Workflow in MODS

    Open MODS, Click mouse right.

    Click program - open program - 1.7 Othermill / PCB


    If see this page, Select .png or SVG file. (In MODS, Can use png or svg. And When using svg files, using mods saves more time than using bantam programs. This is because the offset portion can be adjusted in Mods.)

    Set ‘cut depth’, ‘max depth’, ‘cut speed’, ‘plunge speed’. (If want to adjust offset, change offset number. 0 = fill)cd

  • cut depth : depth cut in one trace
  • max depth : ultimate cutting depth
  • cut speed : trace speed
  • plunge speed : the speed at which endmill coming down.

    • And confirm trace by pressing calculation button. (Press the ‘View’ button to see a larger image.)



    If click ‘send file’, The bantam machine connected to the computer will work.