Quick double-check about bottom silk

Questions about the BatchPCB service

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Doktor J
Posts: 3
Joined: Mon Feb 11, 2013 10:37 pm

Quick double-check about bottom silk

Post by Doktor J » Tue Feb 12, 2013 1:38 am

I notice in the FAQ it says to not mirror bottom layers; I assume this means mirroring the entire layer (so it looks as though you're looking at it "from the bottom" instead of the usual "through the top" view); should I still mirror my text as I do with other fabs, so the text comes out correctly left-to-right when printed?

IOW, is this right?
Image
dark red = top copper
dark blue = bottom copper
magenta = top silk
cyan = bottom silk

TBecker
Posts: 2
Joined: Wed Feb 13, 2013 8:56 am

Re: Quick double-check about bottom silk

Post by TBecker » Wed Feb 13, 2013 8:59 am

AFAIK, when you move stuff to the bottom layer, EAGLE automatically orients the text correctly. Given your example, that cyan text should be printed correctly on the back side of your board. If you mirrored the text on the bottom layer, you could read it from the top, but it would be backwards on the board when you looked at it.

Doktor J
Posts: 3
Joined: Mon Feb 11, 2013 10:37 pm

Re: Quick double-check about bottom silk

Post by Doktor J » Wed Feb 13, 2013 4:00 pm

Well the silk layer is a custom layer, so I'm not sure EAGLE will do anything to it "automatically"; I set the text as mirrored, but placed it where I wanted it.

This type of setup worked well when I sent some boards to OSHPark; however, BatchPCB is much more economical for a single board of the size I want (about 3"x4"), and I wanted to give them a try and compare the output. Of course, to make the most accurate comparison, I want to make sure I submit the files properly!

Doktor J
Posts: 3
Joined: Mon Feb 11, 2013 10:37 pm

Re: Quick double-check about bottom silk

Post by Doktor J » Wed Feb 20, 2013 10:32 am

So... no disrespect to TBecker, but can I get an authoritative response from someone @ sparkfun about this? I'm unemployed right now, so sending off a $40 order to "find out" whether something will come out right just isn't gonna happen.

jmdhuse
Posts: 3
Joined: Mon Apr 30, 2007 4:29 pm

Re: Quick double-check about bottom silk

Post by jmdhuse » Thu Feb 21, 2013 9:00 am

Hi -

I've ordered dozens of boards from BatchPCB over the years and never had a problem with bottom silk text... I do as you would suspect - mirror and place it where you want. It looks backwards on the computer screen because you are "looking" through a transparent board image, but when you turn the actual physcial board over, the text is correct.

Good luck!

Jon.

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Ross Robotics
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Re: Quick double-check about bottom silk

Post by Ross Robotics » Fri Feb 22, 2013 5:13 pm

I wouldn't hold my breath if you are waiting on a response from someone at BatchPBC. They don't post on here. I haven't used BatchpCB but other fabs have no problems with mirrored items on the bottom layer. If you are that worried, use another fab house. Itead and OSH Park are cheap.
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