One trick I sometime use if I cannot find a datasheet, (rare as you can usually find one in the various suppliers catalogues.) is to use a piece of matrix board. Most leaded components are on a 0.1 inch grid (there are exceptions but there are not too many) You can then count the hole spacing.
The footprint is just that, an outline of the component. The critical part is any pad or mounting hole requirements. Just treat the leads as normal component leads, but I would suggest that you make the pads fairly large as they need to support a much heavier component than something like an IC. Andy On Sat, 23 Jan 2010 05:07:25 -0800 (PST) yukku yukkoooooo <[email protected]> wrote: > Hi, > Thank you for the answer. That brings me to the question as to what to do if > I do not have a data sheet for the part. > Can I measure various lengths on the part and gaps between the pins and > create my footprint ? > What should be the minimum tolerance (in inches) to get a decent footprint ? > > Regards > shyam > > > > ________________________________ > From: Veronica Merryfield <[email protected]> > To: [email protected] > Sent: Sat, January 23, 2010 2:51:38 PM > Subject: Re: [kicad-users] Footprint for a Relay ? > > It all depend what actual device the part was based on, but essentially it is > as you say. Relay bases have a long history. > > Find the data sheet for the actual relay you are going to use and pick the > footprint from that. > > My suspicion is that the device in the library is a DIL16 part so you would > need a 16 pin DIL 0.3" footprint for the library device if you are using the > same part that the library is created for. > > Datasheet time. > > > On 2010-01-23, at 1:09 AM, yukku yukkoooooo wrote: > > > > > Hi, > > I am using the Relay RELAY_2RT from the EEschema "device" library. > > I have a couple of question about it - > > 1. Why does it not use contiguous pin numbers instead using pins 1,3,5 8,9 > > and 12,14,16 ? > > My guess is it uses a standard package with missing pins to get double > > spacing. Please confirm. > > 2. What foot print should I use for it in cvpcb ? > > > > Regards > > yukku > > > > > > > > > > ------------------------------------ > > Please read the Kicad FAQ in the group files section before posting your > question. > Please post your bug reports here. They will be picked up by the creator of > Kicad. > Please visit http://www.kicadlib.org for details of how to contribute your > symbols/modules to the kicad library. > For building Kicad from source and other development questions visit the > kicad-devel group at http://groups.yahoo.com/group/kicad-develYahoo! Groups > Links > > > > >
