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akuker / piccolo

A Raspberry Pi Pico clone with a USB-C port.
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Hacky Castellated holes didn't turn out well #3

Open akuker opened 1 year ago

akuker commented 1 year ago

Having "real" castellated holes on the board adds to the production cost.

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An attempt was made with revision 1 to create pseudo-castellated holes by having a regular hole, then using the edge cuts to slice it in half. BUT, the castellated holes option was NOT selected for manufacturing. This was a worthwhile attempt, but in practice, the results from JLCPCB were not clean.

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In the next revision, the design should be updated to use real castellated holes (and pay the extra manufacturing costs) or remove them.

akuker commented 1 year ago

This document sums it up pretty well: https://jlcpcb.com/quote/pcbOrderFaq/Castellated%20holes

Regarding the castellated holes option:

  1. If "Yes" is checked, the castellated holes will be made with a special process and extra cost will be charged.
  2. If "No" is checked, the castellated holes will still be made but with the ordinary process, so the quality is not promised (e.g. defects may highly occur: unplated holes, incomplete plating, hole with copper residues etc.).

Data point: The cost for castellated holes is around $40 for lower volume orders (up to ~100 boards).