[kicad-users]Re: How to make little holes in the pads centers printing from Gerbview?
Thanks to all! Plotting to PostScript solved the problem compleately! I dont need a tuning on a Gerber-level to proto boards, so simple PS files are good enough! KeepIt SimpleStupid : the 1/3 of drill diameter is not a solution in my opinion: 1. for protoboards w/o CNC drill machine it's impossible to make a bull's-eye hit for large drills... I think every hole should be drilled with the smallest diameter (0.8mm in my case). Larger holes drill using 0.8mm as a centering hole. 2. drill's flare angle + copper plane thickness dramatically affects a centering area size. Juan Franco: some years before a program (using !only! PostScript) for making a `knitting machine punched cards' was written by me =) Alain M.: using Postscript+small marks for me eliminates a problem compleately (because I drill ALL holes with 0.8mm and later re-drill with the larger diameter). Regards, Vladimir. Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
Re: [kicad-users]Re: How to make little holes in the pads centers printing from Gerbview?
That's an excellent idea and so is the pilot drill size. I leared that from a machinist although he would use something like 1/3. --- "Alain M." <[EMAIL PROTECTED]> wrote: > > Vladimir Kalyaev escreveu: > > If I'm not mistaken "Print" prints out FULL-SIZED > holes, not SMALL > > centering hole! > > Other explanations: for .6-8mm drill open area > should be 0.2-0.3mm. > > For 0.8mm thru-hole element a drill open area > produced by "Print" > > command equals to the drill diameter. I think it's > impossible to use > > 0.8mm open area for centering a 0.8mm drill! > I did some tests (some years ago) and I finaly > settled that holes *half > the real size* are ideal. That is because dril > centers are bigger for > bigger drills, if you have a .8mm center for a 3.2mm > hole it is just > useless. What I used to do was to define all my pads > with half the real > diameter and fix that in the docs acompanying the > drill file... > > Alain > > In OrCAD there is an option "keep drill holes > open" which produces a > > same-sized holes for each thru-hole element. > > I can write a script for overruding every > thru-hole padshape to force > > a "Print" command work correctly. Is it an only > way? > Just the same, a script could be made to fix that > and generate the print > file. On option could interest some people... > > Alain > > Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
Re: [kicad-users]Re: How to make little holes in the pads centers printing from Gerbview?
Vladimir Kalyaev escreveu: If I'm not mistaken "Print" prints out FULL-SIZED holes, not SMALL centering hole! Other explanations: for .6-8mm drill open area should be 0.2-0.3mm. For 0.8mm thru-hole element a drill open area produced by "Print" command equals to the drill diameter. I think it's impossible to use 0.8mm open area for centering a 0.8mm drill! I did some tests (some years ago) and I finaly settled that holes *half the real size* are ideal. That is because dril centers are bigger for bigger drills, if you have a .8mm center for a 3.2mm hole it is just useless. What I used to do was to define all my pads with half the real diameter and fix that in the docs acompanying the drill file... Alain In OrCAD there is an option "keep drill holes open" which produces a same-sized holes for each thru-hole element. I can write a script for overruding every thru-hole padshape to force a "Print" command work correctly. Is it an only way? Just the same, a script could be made to fix that and generate the print file. On option could interest some people... Alain
Re: [kicad-users]Re: How to make little holes in the pads centers printing from Gerbview?
--- Vladimir Kalyaev <[EMAIL PROTECTED]> wrote: > Subject: [kicad-users] Re: How to make little holes > in the pads centers printing from Gerbview? > > If I'm not mistaken "Print" prints out FULL-SIZED > holes, not SMALL centering hole! > Other explanations: for .6-8mm drill open area > should be 0.2-0.3mm. > For 0.8mm thru-hole element a drill open area > produced by "Print" command equals to the drill > diameter. I think it's impossible to use 0.8mm open > area for centering a 0.8mm drill! Hi Vladimir, You can also plot your board to a PostScript file. In the plot dialogue there is an option to plot drill holes as Real Size, Small Marks or none. If you don't have a PostScript viewing software you may need to install GhostScript + viewer Regards, Juan Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
[kicad-users]Re: How to make little holes in the pads centers printing from Gerbview?
Subject: [kicad-users] Re: How to make little holes in the pads centers printing from Gerbview? If I'm not mistaken "Print" prints out FULL-SIZED holes, not SMALL centering hole! Other explanations: for .6-8mm drill open area should be 0.2-0.3mm. For 0.8mm thru-hole element a drill open area produced by "Print" command equals to the drill diameter. I think it's impossible to use 0.8mm open area for centering a 0.8mm drill! In OrCAD there is an option "keep drill holes open" which produces a same-sized holes for each thru-hole element. I can write a script for overruding every thru-hole padshape to force a "Print" command work correctly. Is it an only way? Excuse me for my bad english... >> It's used during manual board making for centering a drill. >For home-made boards, rather than using the "plot" command to create >gerbers, use the "print" command and print exact 1:1 for each layer. >That way the layers print as they appear on the screen with the >correct width and with open holes in the pads. Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
[kicad-users] Re: How to make little holes in the pads centers printing from Gerbview?
--- In kicad-users@yahoogroups.com, "klui_" <[EMAIL PROTECTED]> wrote: > > It's used during manual board making for centering a drill. For home-made boards, rather than using the "plot" command to create gerbers, use the "print" command and print exact 1:1 for each layer. That way the layers print as they appear on the screen with the correct width and with open holes in the pads. Depending on the method you use to prepare the board for etching you may need to mirror the print, of course.
