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Re: Sprockets again?
You can purchase some sprockets from AndyMark, but try bearing supply stores. Around here (Toronto Ontario Canada) I use "Canadian Bearing" "Toronto Bearing" "Oshawa Bearing" "BMI" etc. Also McMaster Carr. All these sources should be able to sell you sprockets with the correct bore or they will likely sell you a stock bore sprocket. In this case, you to chuck it in a lathe (a drill press can also be used in a pinch) and drill the center out of it to the right size of your shaft. Then you drill and tap a hole in the side of the sprocket to install an allen key. You can also buy cheap keyway broaches which with the help of an arbor press (or something really heavy, a car jack and some creativity) are used to cut internal keyways:
http://www.ebay.com/itm/18-NO-10-HSS...em518e50 9246
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Mentor, Team 2013 Cybergnomes 2010 - 2014, 2016
Mentor, Team 3756 RamFerno 2011 - 2013
Mentor, Team 854 Iron Bears 2005-2007
Founding member, Team 854 Iron Bears 2000-2005
Mech.Eng.+Mgt University of Ontario 2009
B.Ed OCT Trent University 2015
Professional Education and Product Knowledge Consultant - Toyota Canada Inc.
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