#homecmos IRC log for Saturday, 2014-03-08

azonenbergSync__: nice03:07
azonenbergi have stages from digshadow03:08
azonenbergbut not wired up yet03:08
azonenbergthe controllers didnt show up03:08
azonenbergso i'm gonna have to hack something up03:08
SpeedEvilI'm kinda wondering how hard a teeeeny arm would be.09:36
SpeedEvilbeing able to tie knots in 50um wire would be cool.09:37
Sync__yeah, my stages have dc servos azonenberg11:57
azonenbergSync__: these are steppers12:49
Sync__I guess12:52
Sync__nota friend of steppers12:52
Sync__yeah nice15:48
Sync__right on the money... repeatable within 1┬Ám on the ball screw stage15:49
Sync__the regular screw has around 3/100 backlash but I can compensate for that15:49
Sync__http://sync-hv.de/~tmp/stage_running.mp4 I'm ok with that15:58
Action: SpeedEvil is doing CNC soon - maybe - but the initial resolution will be +-0.5mm hopefully.16:01
Sync__well, there is not much point in doing it cnc then16:08
SpeedEvilSure there is.16:11
SpeedEvilIf I can cut 20 shapes in plywood to +-0.5mm - that is quite adequate for making some forms of furniture.16:12
SpeedEvilOr building components.16:12
Sync__I'm probably faster with the bandsaw16:12
Sync__but yes for wood that might be acceptable to some degree16:13
SpeedEvilI'm pondering a full sheet cutter.16:13
SpeedEvilThough other projects for a similar platform are something along the lines of a microbonder.16:13
Sync__I found that it is way easier just to get an old westbond off eaby16:14
SpeedEvilhttp://www.ebay.co.uk/itm/WestBond-2400-TS-AUTOBONDER-X-Y-STAGE-W-MOTOR-PARTS-/150883783329?pt=LH_DefaultDomain_0&hash=item23215fd2a1 hmm16:15
Sync__get a complete one16:16
Sync__building the rest is just too annoying16:17
SpeedEvilMore actually aimed at microsoldering - I want to be able to point-point wirebond 0.5mm BGA.16:17
SpeedEvilAnd alas - funds are a major issue16:17
Sync__for most things a manual bonder is good enough16:19
Sync__or rather for 99.9% of the things that are not in production16:19
SpeedEvilI'm wondering about PCB elimination16:19
SpeedEvilAnd yes - it's probably silly.16:23
SpeedEvilBut - meh.16:23
SpeedEvilIf we only did sensible stuff, where would we be.16:23
Sync__what benefits would cause you to do this?16:32
SpeedEvilrapid inexpensive prototyping, amongst other things.16:33
Sync__well, if you are forced to use .5mm bga I guess you can pay for getting 6 layer pcbs16:35
Sync__otherwise you are also not going to be able to use the chips as they were designed due to parasitic effects16:36
azonenbergSync__: not necessarily17:06
azonenbergi've seen some 0.5mm bga chips that are i2c interface :p17:06
azonenberg3x3 wlcsp17:06
Sync__well yeah.17:12
Sync__but everything that uses .5mm bga for a reason is high speed17:12
SpeedEvilI have ideas about parasitics.17:28
Sync__well it is way easier just to get pcbs made17:31
Sync__also way more cost effective17:37
SpeedEvilFor 2 layer PCBs, totally.17:41
Sync__even with 4 or 6 layers17:42
Sync__getting pcbs made is not expensive anymore17:42
SpeedEvilWhere can I get inexpensive 6 layer PCBs made? I seem to have missed that. Even relatively small ones - say 4*4cm17:43
Sync__it depends on your design rules17:43
Sync__but 4 layer out of china is around $45/5pcs at 50x50mm17:46
--- Sun Mar 9 201400:00

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