pcb-fab

Table of Contents

  1. General processing reminders
  2. Process Guides
  3. Process Capabilites
  4. Process Specifications and Tolerances

General Processing Reminders...

  • Orient all your boards *before* creating any fiducials.
  • 4 fiducials – always.
  • Don't forget to save before generating the toolpath on the ProtoMat!
  • Make sure that the two boxes are checked before selecting a ProtoLaser template.
  • Do not forget the chemical safety gear when electroplating.
  • Get a PI to change any bits in the ProtoMat!

Process Guides

HELP! –> First, go to the proper process guide and make sure you've followed our most up-to-date process. If that doesn't resolve the issue, see the Knowledge Base for processing issues/concerns/questions.

See our tips and tricks page for some advanced processing concepts (or just interesting tidbits).

The above guides targeted towards End Users and PIs (Peer Instructors) who want to know about the standard fabrication process often employed at The Hive, either before they are certified or afterwards. It is not intended to serve as a technical manual for any of these three tools or the software that controls them; for those, see the individual tool SOPs. It is also not intended to serve as a complete list of all processes that can be achieved with this tool suite. It is simply a step-by-step guide to our two most basic and standardized processes.


Process Capabilities

The Hive has a suite of LPKF tools that enable students to fabricate 2-layer prototype-quality PCBs with fully-plated vias on campus. With additional setup, they can also apply soldermask and silkscreen for a production-quality finish, cut a solder paste stencil for part placement, and a reflow solder the components to the board. The tools have numerous additional capabilities beyond simple PCB fabrication, including 2.5D milling and exotic substrates. We encourage our users to explore new uses for the tools; however, as these options are beyond the scope of this document, if you’re interested in doing a non-standard process, we ask that you contact us beforehand.

The Hive's PCB fabrication tool suite has the following capabilities:

  • Substrates: FR4, Rogers materials, polyamide, among many others.
  • Copper thickness/weight: No known limit, other than processing time.
  • Slot: yes, but YMMV.
  • Electroplating: yes, standard processing time of 3 hours will plate approximately 16 um of copper. We also have a chemical-free non-electrical “plating” process with the ProConduct package.

The full suit includes the following:

  • LPKF ProtoMat S103 (datasheet) - drilling, milling, and routing
  • LPKF ProtoLaser U4 (datasheet) - etching, cutting
  • LPKF Contac S4 (datasheet) - electroplating
  • LPKF ProMask (datasheet) - Soldermask
  • LPKF ProLegend (datasheet) - Silkscreen
  • LPKF ProtoPrint S (datasheet) - Solderpaste stencil holder
  • LPKF ProtoFlow (datasheet) - Reflow oven
  • LPKF ProConduct (datasheet - Plating for RF applications

See our Standard Operating Procedures page for further details.


Process Specifications and Tolerances

If you’re board passes OshPark’s specs (OshPark .dru file), it can be made using our process (see their website for details). However, our process can, in fact, go beyond that in some ways.

Specification Minimum/Theoretical Recommended
Trace width 2 mils (0.05 mm) 10 mils (0.25 mm)
Trace spacing (“pitch”) 1 mils (0.025 mm) 6 mils (0.15 mm)
Polygon isolation 10 mils (0.25 mm) 30 mils (0.75 mm)
Drill hit 6 mil (0.15 mm) 15 mil (0.4 mm)
Drill X/Y resolution +/- 0.01 mil (0.25 μm)
Drill repeat accuracy +/- 0.2 mil (5 μm)
Laser repeatability 0.08 mils (2 μm)
Drill hit 0.05 mil (1.2 μm)

See our Knowledge Base for more fabrication-related tips, tricks, and more.

  • pcb-fab.txt
  • Last modified: 2021/01/21 09:36
  • by benh