Draw an "X" Across the Surface Plate. Using the Height Gage and Gage Block measure the difference (Readings) and record. At a starting point on the Surface Plate (Use the left Front Corner as a Ref) Take a reading at every 6". along the X you have generated on paper . Your margin of error will give you the wear points on the plate. To get the greatest margin of error use a rectangle block. It has the least surface area. Square blocks are larger and may miss a deviation. You could also use a steel ball. This would be a bit more difficult but would find the greatest wear on the surface of the plate. This is accurate as far as measurement goes, not necessarily for a surface plate. With your size plate it should take no more than an hour TOPS to calibrate. If you do it every 24 - 36 months - depending on use you may be much more ahead of the game. What I have given you is a gross error method only, and problem a lot cheaper. Regards, Randy Bock Sr. Bryce [log in to unmask] 203 729-5370 Ext 239 ----- Original Message ----- From: "Franklin D Asbell" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, January 30, 2003 3:22 PM Subject: Re: [TN] Calibration/Verification of granite-surface block > Height gage??? I've got a hieght gage, and blocks...how are those applied... > > > ----- Original Message ----- > From: "Randy Bock Sr." <[log in to unmask]> > To: <[log in to unmask]> > Sent: Thursday, January 30, 2003 1:51 PM > Subject: Re: [TN] Calibration/Verification of granite-surface block > > > > A height check with a .0001 indicator and a rectangle gage block. > > > > > > > > ----- Original Message ----- > > From: "Franklin D Asbell" <[log in to unmask]> > > To: <[log in to unmask]> > > Sent: Thursday, January 30, 2003 2:18 PM > > Subject: Re: [TN] Calibration/Verification of granite-surface block > > > > > > > We'll be using this one for the same purpose, do you calibrate in-house? > > If > > > so, what do you use to verify it...thanks... > > > > > > Franklin > > > > > > > > > ----- Original Message ----- > > > From: "Mark Hargreaves" <[log in to unmask]> > > > To: <[log in to unmask]> > > > Sent: Thursday, January 30, 2003 10:31 AM > > > Subject: Re: [TN] Calibration/Verification of granite-surface block > > > > > > > > > > Hi Franklin, > > > > Our granite surface plate is used strictly for warp & twist > measurement > > of > > > > pcb's (very light use). It's on our recall list. The calibration is > > > rather > > > > expensive. I was able to move from yearly cal to 3 year cal by > > > downgrading > > > > the plate from "A" (inspection grade) to "B" (shop grade, I believe) > > which > > > > is still well within our accuracy requirements. > > > > > > > > Regards, > > > > Mark Hargreaves > > > > > > > > -----Original Message----- > > > > From: Franklin D Asbell [SMTP:[log in to unmask]] > > > > Sent: Thursday, January 30, 2003 10:57 AM > > > > To: [log in to unmask] > > > > Subject: [TN] Calibration/Verification of > granite-surface > > > > block > > > > > > > > Can anyone describe to me the method of calibrating/verifying > a > > > > surface > > > > block??? > > > > > > > > Also, in regards to calibration recall, would this need to be > on > > a > > > > recall > > > > list or would it be verify it once in it's lifetime, what > would > > be > > > a > > > > cause > > > > of initial calibration being voided... > > > > > > > > Thanks, > > > > > > > > Franklin D Asbell > > > > > > > > > > > > --------------------------------------------------- > > > > Technet Mail List provided as a free service by IPC using LISTSERV > 1.8e > > > > 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 > > > > ----------------------------------------------------- > > > > > > > > > > --------------------------------------------------- > > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > > > 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 > > > ----------------------------------------------------- > > > > > > > --------------------------------------------------- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > > 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 > > ----------------------------------------------------- > > > > --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > 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 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 -----------------------------------------------------