X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=blobdiff_plain;f=pcb%2Fcsm84%2Findex.mdwn;fp=pcb%2Fcsm84%2Findex.mdwn;h=9bf03384c5a71a85bdd1856bb42f2279479c0666;hp=0000000000000000000000000000000000000000;hb=c75e0810cdbfef24da254fe984eddcede48f6c29;hpb=d2c9aab2960878276b765311601581c49f62e563

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+# Surface Mount Robot
+
+For a long time, we've hand-loaded prototypes and then sent production board
+runs out to one of several 3rd-party surface mount assembly shops.  We've
+tired of dealing with these assemblers, however, would like more control
+over the process, and are intrigued by the [OpenPnP](https://openpnp.org)
+project. 
+
+After playing around for a while with building a machine from scratch, Bdale
+was offered a surplus Philips (Yamaha) CSM84 pick and place robot.  This is
+a massive thing to make room for in a home shop, but as designed it's meant
+to be able to hold 84 reel feeders with 8mm width reels, has a conveyer belt
+for loading and unloading assembly panels, 3 placement heads, and very good
+fundamental mechanical accuracy and repeatability.  Unfortunately, the machine
+controller is 1980's era technology, and the machine isn't really capable of
+handling 0402 parts as-is.  The goal, therefore, is to convert the machine
+over to using a modern control and vision system running OpenPnP, capable of
+loading [Altus Metrum](https://altusmetrum.org) and other products that make
+heavy use of 0402 passive components, and fine-pitch integrated circuits.
+
+## Sub-Projects
+
+* The stock machine has a nozzle vacuum sensing board that uses an analog
+  amplifier and comparators to output 3 states per nozzle as a 2-bit digital
+  signal.  OpenPnP would rather have simple analog vacuum sensors on each 
+  nozzle, readable by one of the system's control interfaces, then implement
+  the thresholds in software.  That that end, Bdale designed a [replacement
+  vacuum board](https://git.gag.com/hw/csm84vacuum) that uses 3 NXP 4115
+  series analog output vacuum sensors, intended to be attached to three of
+  the "thermistor" inputs on the Smoothieboard that also provides axis servo
+  control.
+