Re: [PEDA] More Qs :)
Hello Waheed, Monday, May 20, 2002, 2:35:29 AM, you wrote: > Hello all, > Whats a polygon good for? Polygons are used to place a copper area (very often a small "ground plane") on the board. > Also what are Gerber, Gerber Photoplot files will contain the instructions that a photoplotter will use to plot the artwork necessary to produce your PC boards. > NC Drill NC (Numerically Controlled) Drill files are used by the PC maker's drill to drill the holes in your board. > and Pick and Place files (CAM) Pick and Place files would be used by a board assembly shop to automatically place components on the boards. When you have finished your board design, you will produce Gerber photoplot files for each copper layer, solder mask, and silkscreen layer, and an NC drill file, and send all these files off to the shop that will produce the bare board. If the board uses surface mount components, you will produce a Gerber file for the solder mask layer, and provide that to the assembly shop - they will get a solder paste screen made from that file, and use the screen to apply solder paste to the board before placing the components. If the assembly shop uses auto-place machines, you can produce a Pick and Place file for them. -- Peter Bennett, VE7CEIVancouver, B.C., Canada GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver-webpages.com/van-ps * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] More Qs :)
At 02:35 PM 5/20/2002 +0500, Waheed Bajwa wrote: >Whats a polygon good for? For filling an area of a PCB with copper. Also called a "copper pour." Properly set up, the inside of the polygon will fill with copper (track) except for clearances as determined by the appropriate design rules around pads, via, and other primitives not belonging to the same net as the polygon. > Also what are Gerber, NC Drill and Pick and Place files (CAM) Gerber: standard file format for photoplots. Gerber was originally devised to control mechanical photoplotters that drew with light by moving an aperture (an opening for light to pass through) over a film (actually, the film was usually moved, not the aperture, same difference; conceptually it was the aperture that was used to draw.). The original gerber used a separate aperture list; the early plotters only had relatively few apertures on a wheel. RS-274X gerber added more sophisticated commands and features, the most notable of which is embedded apertures, so that no extra aperture table is necessary. Protel will generate one anyway NC Drill: This is a file with tool (drill) sizes and positions, for controlling a Numerically Controlled drilling machine. The format is called Excellon from one of the manufacturers. There are also other formats. Pick and Place: A file with the position of all components and their rotations, for use with automated assembly (pick-and-place) machines. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] More Qs :)
A polygon makes a good ground fill (GND). The Gerber and NCDrill files are for the board manufacturer and the pick and place are for the SMD-placers. Rene Waheed Bajwa wrote: > > Hello all, > > Whats a polygon good for? Also what are Gerber, NC Drill and Pick and Place files >(CAM) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] More Qs :)
hi waheed, a polygon is good when you have irregulary shaped planes of copper. gerber files are what you finally knock out when you are ready to get a board made. you walk thru the file/cam manager and then F9 to generate them. you send these to the board shop to get the board made, along with the NC drill file, too. i don't know about the pick and place stuff. good luck, waheed. i've been using protel on and off for two years and i'm still learning stuff. miker -Original Message- From: Waheed Bajwa [mailto:[EMAIL PROTECTED]] Sent: Monday, May 20, 2002 4:35 AM To: Protel EDA Forum Subject: [PEDA] More Qs :) Hello all, Whats a polygon good for? Also what are Gerber, NC Drill and Pick and Place files (CAM) Best Regards, Waheed Bajwa == Design Engineer Communications Enabling Technologies Software Technology Park, 5-A Constitution Avenue, Islamabad - 44000 Pakistan Ph. No: +92-51-2826160 Ext. 254 http://www.enabtech.com == * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
[PEDA] More Qs :)
Re: [PEDA] More Qs
> What is a thermal relief connection? OK. On the PCB you have holes (for your components) and pads around (for soldering). You connect these pads with traces. If you decide to fill everything else of the board with a copper, you can place a polygon. If this polygon is attached to a net (let say GND), all traces and pads, which are not connected to it, will be automatically cleared. The pads that are connected to the same net (GND) may be connected directly (you'll see only the hole) or thermally (you'll see this: \ / o / \ or | -o- | If you need to solder a pad, which is connected to a big copper polygon or a plane, you'll need much more to heat it during soldering. To avoid this we use thermal relief pads. The "plane" is normally in inner layers (used for spreading out the VCC and GND), negative image, solid copper and pads only. Mira __ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
