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How to make PCB

How to make PCB

edited by Yongwoo Song Y Eduardo Chamorro

Santi Fuentemilla

February 19, 2019
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  1. HOW TO MAKE PCB edited by Yongwoo Song Y Eduardo

    Chamorro USING SRM-20, Small Milling Machine
  2. 1. What is PCB 2. PCB Production 3. PCB Endmill

    4. SRM-20 Operation 5. Practice INDEX
  3. TYPES OF COPPER BOARD FR4 : Epoxy resin (fiber glass),

    multiple layer (multiple use) double sided or more can be fabricated FR1 : Phenol resin (paper fiber), less hardened than FR4 single sided board
  4. CHOOSING THE BOARD TYPE 1. Check if it is power

    circuit / signal circuit 2. If SMD components are needed or not 3. If there are too many components for difficult wiring 4. What’s the final goal for the price
  5. - Recommended feed rate of mills - Making Traces :

    3.5 ~ 4 mm/s Outline Traces : 0.5 mm/s SPEED CALCULATION
  6. FAB MODULE INTERFACE 1. Check Machine 2. Feed Rate setting

    3. X, Y, Z origin 4. Calculate 5. Save
  7. FIXING THE COPPER BOARD MAKE SURE THERE ARE NO BLANK

    SPACES !!! DON’T TRY TO SAVE DUCT TAPE, SAVE COPPER BOARD ~
  8. SETTING ORIGIN POINT (USER COORDINATE SETTING) CHECK TO MAKE SURE

    ORIGIN POINT IS USER COORDINATED (ex G54) PRESS
  9. Select layers that are needed for monochrome image Remember to

    edit some design with 2D design tools such as Photoshop / illustrator / GIMP etc.
  10. WHAT WE NEED TOOLS - Roland SRM-20 - Computer with

    VPanel Installed - Soldering Iron -Flat end mills, 1/64” and 1/32”, -(If equipped) Flat end mills, 1/16” for clearing out all excess copper MATERIALS - Double-sided FR-1 PCB - Double-sided tape - Solder & Solder paste - Velcro straps (accesories) ELECTRONIC COMPONENTS - Atmel ATtiny chip (ATtiny 85) - LEDs (SMD) = Surface Mount Device components - Resistors, ~499 ohms (SMD) - Momentary button, square (SMD) - Coin cell battery, CR2032, 3-volt - Coin cell battery holder
  11. Order of making tool path FILES note : black for

    the end mill to recognize 1. (filename)_traces.png
  12. OBJECT - PATH - ADD ANCHOR POINTS Add as enough

    amount to know the outline of the drawings Save the file in dxf RT13 format!!
  13. RUN ULP FOR IMPORTING VECTORS import_dxf_polygons.ulp is available at GitHub

    for windows put the .ulp file in C://Program files/Eagle
  14. 1. Use a good soldering iron (cordless, temperature-controlled…) 2. Correct

    type of vice or third hand 3. Use the thinnest solder appropriate for the project 4. Use the right-size time for the project 5. Allow the soldering iron the reach the right temperature 6. Apply the iron to the joint first then solder to allow the spread. 7. Don’t put too much solder … bigger the blob, more trouble 8. Tin your wires by placing small solder first and wipe it off 9. Clean the tip often with iron wool, a wet sponge and tip cleaner 10. Don’t apply pressure on the soldering iron 11. Don’t move the joint while its cooling and don’t blow it 12. Practice on scrap before starting the joint, and practice practice !!! SOLDERING TIPS
  15. 1. Don’t burn yourself 2. Don’t burn anything else 3.

    When you burn yourself - because you will - be sure to have first aid kit 4. Wear pants to protect your legs, safety glasses 5. Don’t wear polyester clothing 6. Work in a clean area free of oils, grease and anything that is flammable 7. Solder slowly and stay focused 8. Always return the soldering iron to the stand after each use 9. Remember !!! It takes a long time for the soldering iron to cool off 10. Always unplug the soldering iron when you’re done SOLDERING SAFETY