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mdcpickandplace:tips [2009/11/04 16:50]
ladyada
mdcpickandplace:tips [2016/01/28 18:05] (current)
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-====== PCB Stencils ​======+===== PCB Stencils =====
  
 Unless you get a dispenser module add-on, you'll need to silkscreen / screenprint solder paste onto the PCBs. Most PCB stencils are made of stainless steel and last years. Right now [[http://​ladyada.net/​wiki/​laserinfo/​pcb_stencils|we make our stencils out of kapton (polyamide) with a laser cutter]] Unless you get a dispenser module add-on, you'll need to silkscreen / screenprint solder paste onto the PCBs. Most PCB stencils are made of stainless steel and last years. Right now [[http://​ladyada.net/​wiki/​laserinfo/​pcb_stencils|we make our stencils out of kapton (polyamide) with a laser cutter]]
  
 You can also get this done for you as a service from [[http://​www.pololu.com/​catalog/​product/​446|Pololu]],​ or [[http://​www.ohararp.com/​Stencils.html|Ohararp]] It should be $20 or so for a small sheet. ​ You can also get this done for you as a service from [[http://​www.pololu.com/​catalog/​product/​446|Pololu]],​ or [[http://​www.ohararp.com/​Stencils.html|Ohararp]] It should be $20 or so for a small sheet. ​
 +
 +===== Digi-Reels =====
 +
 +Say you want to make 100 accelerometer boards (using the ADXL335) but you're not keen on buying 2000 pieces that make up a full reel. You could try to go with cut tape (hassle) //or// you can go with a "​[[http://​dkc1.digikey.com/​US/​EN/​help/​DigiReel.html|digi-reel]]"​. This is a service offered by [[http://​www.digikey.com|Digikey]] where they will take a piece of cut tape and add a leader (long piece of '​empty'​ tape) and footer ​ so that you can mount it on a pick and place. Its kind of brilliant, and costs only $7 on top of parts cost. You can also make your own, of course, by saving old tape. 
 +
 +===== Sticky tape =====
 +
 +Test your parts placement by laying down double-sided sticky tape onto a PCB. It'll keep the parts in place without the mess of paste
 +
 +===== Nozzle sizes =====
 +
 +Use the biggest nozzle you can to pick up parts. The bigger the nozzle, the less slipping you'll get
 +
 +
/home/ladyada/public_html/wiki/data/attic/mdcpickandplace/tips.1257353447.txt.gz · Last modified: 2016/01/28 18:05 (external edit)