Double Sided PCB

scott216
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Joined: Thu Oct 10, 2013 12:35 pm
Location: New Jersey

Double Sided PCB

Post by scott216 » Sat Jul 26, 2014 9:32 pm

Created my first two sided PCB with my Shapeoko. It came out pretty good. In my PCB design I put registration holes at each corner of the PCB (they get milled away when I mill the outline). I had to edit the g-code so these holes would be deeper (0.25") then the normal holes. I milled the bottom side, then drilled the holes, then I flipped the PCB over and used pins to register the PCB. The pins don't stay there, I use double sided tape to hold the PCB. Then I moved my x-axis zero point to the left - same width as the PCB. I'm using the new touch-plate feature in GRBL (dev v0.9f) to zero my z-axis. This works great, it's so much faster to set my z-axis now.

I'm using a 0.3mm end mill with lots of WD40 on the board. My feedrate is 4ipm and depth is 0.005 inches. I do want to experiment to see if I can go faster. I'm using Cadsoft Eagle with the pcb-gcode script to generate the g-code.
Attachments
Weather Data PCB Bot.jpg
Bottom PCB
Weather Data PCB Bot.jpg (116.38 KiB) Viewed 5867 times
Weather Data PCB Top.jpg
Top PCB
Weather Data PCB Top.jpg (134.26 KiB) Viewed 5867 times
Shapeoko 2 with DW660
grbl v0.9g
PCB Toolchain: Cadsoft Eagle > pcb-gcode > Chilipeppr or GRBL Panel
Other Toolchain: Fusion 360 > Chilipeppr or GRBL Panel
My Build Log
Location: New Jersey

cvoinescu
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Joined: Thu Jul 19, 2012 6:50 pm
Location: Camberley, UK
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Re: Double Sided PCB

Post by cvoinescu » Sat Jul 26, 2014 10:26 pm

That is a superb PCB. Good job!
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

WillAdams
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Location: Pennsylvania --- south of the Turnpike, East of US-15
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Re: Double Sided PCB

Post by WillAdams » Sun Jul 27, 2014 1:16 am

Agreed. That's one of the cleanest, neatest boards, w/ the most consistent traces I've seen posted here.

Thanks especially for posting your feeds and speeds. I've been thinking it'd be nice to dress that page up w/ sample images --- yours would be a great one to show just what the machine is capable of.
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

scott216
Posts: 226
Joined: Thu Oct 10, 2013 12:35 pm
Location: New Jersey

Re: Double Sided PCB

Post by scott216 » Sun Jul 27, 2014 3:24 am

I was getting ready to solder it and it struck me I didn't take into account the holes are not plated through :cry: Most of the holes are for headers and I can't solder those pads if they are on the top layer. Previous to this all my double sided boards were sent out to be made so the holes were plated through. I won't make that mistake again.

To get good results you need pretty low spindle run-out. I found on my Dewalt DW660 that the collet runout varied a lot from one collet to another.

I read a tip somewhere that flatbed scanners do a good jog for "taking pictures" of PCB boards, that how I got the pictures I posted.
Shapeoko 2 with DW660
grbl v0.9g
PCB Toolchain: Cadsoft Eagle > pcb-gcode > Chilipeppr or GRBL Panel
Other Toolchain: Fusion 360 > Chilipeppr or GRBL Panel
My Build Log
Location: New Jersey

cvoinescu
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Location: Camberley, UK
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Re: Double Sided PCB

Post by cvoinescu » Sun Jul 27, 2014 2:35 pm

Forgot to ask -- is that double-sided FR1? I would like to avoid milling FR4 (out of concern for both my tool and my lungs), so if you have a source of inexpensive double-sided FR1, I'm interested.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

scott216
Posts: 226
Joined: Thu Oct 10, 2013 12:35 pm
Location: New Jersey

Re: Double Sided PCB

Post by scott216 » Sun Jul 27, 2014 4:04 pm

cvoinescu wrote:Forgot to ask -- is that double-sided FR1? I would like to avoid milling FR4 (out of concern for both my tool and my lungs), so if you have a source of inexpensive double-sided FR1, I'm interested.
It's FR1, got it from Inventables: https://www.inventables.com/technologie ... ard-blanks
Even though it's FR1, dust insn't a problem for me because I have a the WD-40 pooled up on top of the PCB. It just creates this copper/FR1 sludge. I put a border of masking tape around the perimeter of the PCB to help keep the WD-40 contained.
Shapeoko 2 with DW660
grbl v0.9g
PCB Toolchain: Cadsoft Eagle > pcb-gcode > Chilipeppr or GRBL Panel
Other Toolchain: Fusion 360 > Chilipeppr or GRBL Panel
My Build Log
Location: New Jersey

cvoinescu
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Re: Double Sided PCB

Post by cvoinescu » Sun Jul 27, 2014 5:33 pm

I'm not afraid of FR1 dust, but I want to avoid extra-fine fiberglass dust (FR4). I know Inventables carries the double-sided FR1, but I haven't found them anywhere else.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

Auarhau
Posts: 243
Joined: Tue Feb 25, 2014 8:46 pm

Re: Double Sided PCB

Post by Auarhau » Tue Jul 29, 2014 5:27 pm

Great results!

I thought this video might fit in here, since this is the post that pops up on searching the topic. I found it instructional.

ShapeOko 2. Nema 17 74 oz·in. GAUPS shield on Arduino Uno. DRV8825 Drivers x4 . Kress 1050 FME-1. Z Acme Screw. Threaded inserts table.

scott216
Posts: 226
Joined: Thu Oct 10, 2013 12:35 pm
Location: New Jersey

Re: Double Sided PCB

Post by scott216 » Thu Jul 31, 2014 1:52 am

cvoinescu wrote:Forgot to ask -- is that double-sided FR1? I would like to avoid milling FR4 (out of concern for both my tool and my lungs), so if you have a source of inexpensive double-sided FR1, I'm interested.
Othermachine carries the PCB boards: http://store.othermachine.co/collection ... oducts/pcb
Shapeoko 2 with DW660
grbl v0.9g
PCB Toolchain: Cadsoft Eagle > pcb-gcode > Chilipeppr or GRBL Panel
Other Toolchain: Fusion 360 > Chilipeppr or GRBL Panel
My Build Log
Location: New Jersey

cvoinescu
Posts: 4442
Joined: Thu Jul 19, 2012 6:50 pm
Location: Camberley, UK
Contact:

Re: Double Sided PCB

Post by cvoinescu » Thu Jul 31, 2014 8:23 am

scott216 wrote:Othermachine carries the PCB boards: http://store.othermachine.co/collection ... oducts/pcb
Thank you. They appear to ship only to the US, though.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

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