[sdiy] PCB faceplate large hole creation?

Mike Bryant mbryant at futurehorizons.com
Fri May 28 11:16:23 CEST 2021


Depends on your vendor.  For JLCPCB it seems to be the outer edge, not the centre line, as their DRC allows tracks within 0.2mm of the edge (not that I ever put them that close), and they route the outline with a 0.65mm mill if not done with laser.


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Richie Burnett
Sent: 28 May 2021 09:47
To: Synth-diy
Subject: Re: [sdiy] PCB faceplate large hole creation?

For PCB profile routing (milling) is it normal to:

1. Draw the Gerber line where you want the PCB edge to end up?  (and they make allowances for the cutting tool diameter.)

_or_

2. Draw the Gerber line where you want the centre line of the cutting tool to follow, knowing in advance what the cutting tool diameter is, so that you end up getting the right size cut-out?

I've encountered both approach, and on occasion been caught out!  Just wondered if there was a consensus on the way it is normally handled?

I can see advantages and disadvantages to both methods.

-Richie,




-----Original Message-----
From: Roman Sowa
Sent: Friday, May 28, 2021 9:26 AM
To: Synth-diy
Subject: Re: [sdiy] PCB faceplate large hole creation?

AFAIK JLCPSB does not use laser cutting, not even laser drilling, as they do not offer HDI boards where laser cut vias are common. All boards are milled with router bits.

Every PCB manufactures has detailed description of their capabilities and requirements, that nobody reads. Usually all manufacturers drill up to 6mm diameter, and anything above is milled. You can draw anything in Keepout layer as long it is doable with 2mm mill bit (no sharp inside
corners) and they will cut it without bothering you asking what your intention was. And without increase in price.
I used to add mechanical layer to show them how nice I am and want to minimize their precious engineering time, but turns out they rely on keepout layer mostly to do all the routing.

There is free tool out there - gerbv.exe, search the net. I check all my designs with it before sending. And whatever it shows, is always the same in real thing from JLCPCB. Even if online JLCPCB Gerber viewer gets totally confused and shows rubbish.

Roman

W dniu 2021-05-27 o 17:23, Mike Bryant pisze:
> Depends on who is making the PCB.  JLCPCB use a laser cutter to cut 
> any shape in the PCB.  I had some large fan sized holes with 
> crosshairs in my last order.  Best to use the tool of the PCB 
> manufacturer for something like this though
>
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of 
> doug at synthark.com
> Sent: 27 May 2021 16:05
> To: Synth-diy
> Subject: [sdiy] PCB faceplate large hole creation?
>
> I'm building a jack faceplate, which requires large holes (MIDI, USB).
> While I can create the holes in my PCB tool (DipTrace), it flags most 
> of the holes as DRC violations (too large to drill, > 0.2"), which 
> makes sense, since PCB fabs probably aren't setup to drill large 
> holes.  I'm guessing my best solution would be to CNC the PCB after 
> it's fab'd (since the USB hole is not circular).  Can anyone confirm 
> or provide a better solution?
>
> Thanks,
> --
> Doug Huseby
> http://synthark.com
> http://synthark.org
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