Hi, David, If +/-5 degrees is measurable, +/- 1 degree should be as well, only with more sensitive equipment. I believe angles are or can be measured using optical interferometry or X-ray. For optics, this requires a grid or graticule of particular line pitch - the finer the tolerence to be measured, the finer the pitch of graticule needed to produce visible fringes. Since instrumentation using light wavelengths is commonly used to measure things with differences within one wavelength of the light source, a tolerence as coarse as 1 degree should be quite easy. Sorry I can't suggest actual equipment to do this, and I've no idea about costs. Product yield @ 1 degree tolerence will be down on same product @ 5 degrees tolerence, so unit costs will increase unless 1 degree tolerence is within the capability of the process(es) concerned anyway. Just find yourself a precision machineshop specialising in aerospace products and you should have no real practical problems Peter David Hoover <[log in to unmask]> 03/07/2002 12:39 PM Sent by: TechNet <[log in to unmask]> Please respond to David Hoover To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: [TN] Angle Tolerances I have a customer who has specified +/-1 degrees on angles in the general tolerance portion of their part number title block on their blueprint. On other prints the typical tolerances found are +/5 degrees. Is this +/-1 degrees something that's possible? What on earth could measure something like that? Is their a general specification that lists volume/production tolerances including something like these angles? I'm extremely curious, David Hoover Staff Application Engineer Multek Technology, Inc. www.multek.com --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------