Electronics Forum | Mon Jan 21 16:01:04 EST 2008 | fsw
All, I have a customer requirement for a PCB that has rounded corners with a radius of 0.031". Present brd house says this cannot be met. Any comments?
Electronics Forum | Mon Jan 21 18:57:02 EST 2008 | davef
We think maybe 50 thou would be a more approachable corner radius. Why does your customer want to have radiused corners?
Electronics Forum | Tue Jan 22 17:20:05 EST 2008 | fsw
All, Thnx for the replies! The brd thickness is 0.062", hence no confusion there. Have no idea why customer's engineer specd in the 31 thou radius. Asked them but have no definitive answer as yet.
Electronics Forum | Mon Jan 21 18:11:35 EST 2008 | dyoungquist
0.031" radius is a diameter of 0.062" which is very tight (small) for a rounded corner. I would tend to agree with the board house that is can not be done. 0.031" is a standard thickness of PCB. I think it is very possible that your customer swapp
Electronics Forum | Tue Jan 22 16:05:51 EST 2008 | jmelson
This is an OUTSIDE corner spec or an inside corner spec? If outside, I don't see why it is a problem, but will require programming the router or making a template (if an "old school" shop.) Yes, if an inside corner, then it requires a small router
Electronics Forum | Thu Jan 12 10:21:59 EST 2006 | Dhanish
Can someone advice how the outer ring of TH part can get missing during Wavesolder process beside the Temperature Profile?
Electronics Forum | Tue Apr 25 12:01:17 EDT 2006 | daxman
Just thought I'd post and let you all know, SMT Research helped me identify the issue here. Turns out it's the outer moveable rail on the XY table. The clamp bracket brakes were in bad shape, and the outer rail was slipping.
Electronics Forum | Tue May 14 20:45:45 EDT 2002 | davef
Ashok Dhawan, an old friend of SMTnet, says: Formula for counting components on SMT tape & reels [spiral belt]: Length = Number of turns * 1/2 * 22/7 * ( dia outer + dia inner), where ... Number of turns = ( dia outer - dia inner) / thickness of
Electronics Forum | Sun Jul 19 06:11:32 EDT 2009 | dekhead
For 29x29; 622mm from rear (outer) edge of frame to front edge of board.
Electronics Forum | Wed Jul 21 10:26:19 EDT 2010 | cyber_wolf
They define outer tray dimension and thickness. The array is specific to the component type.
