thanks for the tips
a bit more involved than what we have done
ds
_______________________________________________________________________ Integrated Controls, Inc. Tel: 415-647-0480 EXT 107 2851 21st Street Fax: 415-647-3003 San Francisco, CA 94110 www.integratedcontrolsinc.com
Brad Velander wrote:
Dennis, I did this (special internal/external routes)at my previous employer all the time. I mean almost every board. I never had a problem across a number of fabricators. Here was my methodology.
I would use a mechanical layer. The layer would be specified for a particular routing bit diameter (i.e. Mech 6 - 0.062" Router path). Then on that layer I would draw the centerline of the actual router path with start and stop points. I usually obtained this through ACAD and then imported it to Protel because I could use their simple offset functions. On some boards that had some very small diameter detailed routes I may have used up to 3 router diameters on different layers.
If I had some feature where it was desirable to have some of these routes plated, then it was a mech layer for X diam. router and it was a plated feature layer. There would be a special note in my file notes just to make sure they were pointed to the fact this router path layer was plated features.
I would also place a layer name right in the database for each layer so that it was included right in the gerbers. i.e. "Mech 6 - 0.062" Router Path Centerline (PLATED)"
Then all you have to do is know what are the common router diameters available at your fab shops and stick to those sizes. (typically 0.062" and 0.093" at most shops, 0.0325" at some and 0.04?" at others) If needed they can buy other router bits and don't need any interface with you to do so.
Sincerely, Brad Velander Senior PCB Designer Northern Airborne Technology 1925 Kirschner Rd., Kelowna, BC, V1Y 4N7. tel (250) 763-2329 ext. 225 fax (250) 762-3374
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dennis Saputelli Sent: Friday, February 04, 2005 10:48 AM To: Protel EDA Discussion List Subject: Re: [PEDA] Specifying plated internal cutouts in DXP2004
I did that (1 mil holes)
yeah it forced a phone call but they were sort of upset that i really wanted 1 mil holes and they couldn't do them
after i explained (language issues here as well) they still couldn't understand why i put a 1 mil drill in the tooling if i wanted a slot
i've had more trouble over these slots than i would care to admit and i have tried about every method i have ever seen mentioned
esp if the slot is *almost* a round and there are a lot of them close together
nowadays we only do them when they are really a must_have feature
they just burn too much time on either the front end or the back end
there really ought to be a better way
ds
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