i'm sure you are right about that you can groove on one side or two, sometimes they like to see a dwg showing the depth of the groove
it is a little sloppy but it saves material and break apart cleanup time i am running some boards now (with light components) that snap apart like a charm the panel is about 8x10" and breaks into 10 boards which get waved all at once you do get a little fraying at the edges and as mentioned i wouldn't want to slide them in a card cage, but for some jobs they are just right i *think* the depth was set to leave half the material thickness left after grooving on both sides it was FR4 062" thick (it might be a little less deep than that which is what prompted this) i would worry about putting heavy transformers on there, but then that is an issue with tab routing too Dennis Saputelli Danny Bishop wrote: > > hmmm... I would suggest that your mechanical design should take into account > the inacurracy associated with the v-grooving, again it is application > specific, but getting too tight with PCB's is fraught with danger, not sure > what the CTE of FRx is, but can't be too good. > > It sounds like a tough call for a scientific approach to specifying the > v-groove depth, as the load distributions on the board is likely more > important than the board weight as a whole. > > Danny > > > -----Original Message----- > > From: Dennis Saputelli [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, 5 June 2002 9:45 AM > > To: Protel EDA Forum > > Subject: Re: [PEDA] Issues related to Excellon Format and Scoring > > > > > > right, but keep in mind that the location of the V groove is not as > > accurate as routing so that may be an issue in some boxes > > > > (in fact i had a few large bds once with the V groove going diagonally > > across the whole thing! must have slipped) > > > > anybody know any scientific method of specifying V groove > > depth for the > > given board weight and size? > > sometimes the fabricator will ask me this question and i > > usually answer > > to do what you usually do > > > > Dennis Saputelli > > > > > > Danny Bishop wrote: > > > > > > HI all > > > > > > with regards to below: > > > > > > scoring (or v-grooving) is a cheaper way to manufacture > > boards as the > > > scoring tool has to remove less material, so it can move a > > lot faster. The > > > boards will be a lot cheaper with this method. The tradeoff > > is that you need > > > more clearance from copper and components to the edge of > > the board, which > > > may or may not be a problem depending on the design. > > > > > > Routing can be used with a panelized manufacturing process, > > you just need to > > > leave some areas for break off tabs - this is a small area > > that is not > > > routed, but several small drill holes are made to enable > > you to snap them > > > out of the panel after the boards are populated. > > > > > > cheers > > > > > > > > > > > > Secondly, some FABSs specify different distances between > > > > Pad/Trace to Board > > > > > Edge for 1) Routing Method 2) For V-Cutting (scoring). So > > > > whats the point in > > > > > specifying different distances and What does the Terms > > > > "Routing Method" and > > > > > "Scoring" refer to ? > > > > > > > > You probably need to work out with YOUR board fabricator what > > > > they need in > > > > this regard, and then see how it works out in your board > > > > design. You probably > > > > don't > > > > want the router to trim the board right across a component > > > > hole, but maybe your > > > > > > > > design really needs this. As long as you say this is really > > > > what you want, > > > > most > > > > board houses can make it that way, but they will call back > > > > and say they think > > > > you > > > > have an error in the routing outline. I put a trace on a > > > > mechanical layer and > > > > have > > > > it added to all layers, and tell the board maker to route the > > > > board outline to > > > > that > > > > trace. That seems to satisfy most makers. > > > > > > > > Scoring is how you have the router cut part way through the > > > > board, so you can > > > > put large panels into your pick and place machine, and then > > > > break them apart > > > > into single small boards after stuffing, soldering and > > > > testing. Most makers > > > > charge > > > > extra for this. If you are making them by hand, don't bother > > > > with scoring. > > > > > > > > -- > > ______________________________________________________________ > > _____________ > > www.integratedcontrolsinc.com Integrated Controls, Inc. > > tel: 415-647-0480 2851 21st Street > > fax: 415-647-3003 San Francisco, CA 94110 > > -- ___________________________________________________________________________ www.integratedcontrolsinc.com Integrated Controls, Inc. tel: 415-647-0480 2851 21st Street fax: 415-647-3003 San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
