From sjo at snf.stanford.edu Sun Apr 1 18:48:31 2007 From: sjo at snf.stanford.edu (sjo at snf.stanford.edu) Date: Sun, 1 Apr 2007 18:48:31 -0700 Subject: Comment wafersaw SNF 2007-04-01 18:48:31: O-ring, light fixed Message-ID: I replaced the loose chuck pin O-ring with a Buna-N size 2-5 from the physics store. I also replaced the burnt-out "emergency stop" switch light with a yellow LED. This is a tad bit dimmer than the regular bulb, but on the plus side, it should now never burn out again. From sjo at snf.stanford.edu Sun Apr 1 18:52:56 2007 From: sjo at snf.stanford.edu (sjo at snf.stanford.edu) Date: Sun, 1 Apr 2007 18:52:56 -0700 Subject: Comment wafersaw SNF 2007-04-01 18:52:56: Autocut worked well Message-ID: Autocut worked well for me. For the 100mm wafer, I chose to forgo the circular substrate option "diameter" in favor of the rectangular X and Y street lengths of 110mm. In this mode, alignment to the "First" street is requested, which is the one closest towards the operator. Furthermore, I chose "Entry" and "Feed" speeds to be both identical and slow enough for safe entry - 2mm / sec, 15krpm, for a Pyrex/Si wafer sandwich, cut with resin blade. From shwong at snf.stanford.edu Thu Apr 5 13:26:10 2007 From: shwong at snf.stanford.edu (shwong at snf.stanford.edu) Date: Thu, 5 Apr 2007 13:26:10 -0700 Subject: Problem wafersaw SNF 2007-04-05 13:26:09: can't untighten the current blade Message-ID: From eenriquez at snf.stanford.edu Mon Apr 9 09:53:50 2007 From: eenriquez at snf.stanford.edu (eenriquez at snf.stanford.edu) Date: Mon, 9 Apr 2007 09:53:50 -0700 Subject: Problem wafersaw SNF 2007-04-05 13:26:09: can't untighten the current blade Message-ID: Untightened the blade. Also cleaned and polished spindle shaft. From davegage at snf.stanford.edu Wed Apr 18 10:32:39 2007 From: davegage at snf.stanford.edu (davegage at snf.stanford.edu) Date: Wed, 18 Apr 2007 10:32:39 -0700 Subject: Shutdown wafersaw SNF 2007-04-18 10:32:38: Y-axis (front) Failure Message-ID: After completing the the z-height calibration, the machine reported y-axis (front) as 'bad'. Mary Tang rebooted the system, but the problem persisted, indicating a mechanical problem. From eenriquez at snf.stanford.edu Tue Apr 24 11:08:35 2007 From: eenriquez at snf.stanford.edu (eenriquez at snf.stanford.edu) Date: Tue, 24 Apr 2007 11:08:35 -0700 Subject: Comment wafersaw SNF 2007-04-24 11:08:35: Update Message-ID: Ordered new y-axis servo motor amplifier. It should arrive tomorrow. From eenriquez at snf.stanford.edu Wed Apr 25 15:01:24 2007 From: eenriquez at snf.stanford.edu (eenriquez at snf.stanford.edu) Date: Wed, 25 Apr 2007 15:01:24 -0700 Subject: Shutdown wafersaw SNF 2007-04-18 10:32:38: Y-axis (front) Failure Message-ID: Replaced y axis servo motor amplifier. From eenriquez at snf.stanford.edu Wed Apr 25 15:01:35 2007 From: eenriquez at snf.stanford.edu (eenriquez at snf.stanford.edu) Date: Wed, 25 Apr 2007 15:01:35 -0700 Subject: Comment wafersaw SNF 2007-04-24 11:08:35: Update Message-ID: Replaced y axis servo motor amplifier. From sjo at snf.stanford.edu Mon Apr 30 15:46:46 2007 From: sjo at snf.stanford.edu (sjo at snf.stanford.edu) Date: Mon, 30 Apr 2007 15:46:46 -0700 Subject: Comment wafersaw SNF 2007-04-30 15:46:45: Blade shredded, overtightened Message-ID: The blade that was on the hub was totally shredded (accident?) and grossly overtightened. Even after getting the nut off, the blad was still stuck and needed a lot of gentle prying and some water to come off. Please remember to only finger-tighten the nut when fastening the blade.