BritishIdeas » resources http://www.britishideas.com Interesting Tech Projects Sun, 23 Oct 2011 20:05:43 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Pitch Conversions http://www.britishideas.com/2007/10/17/pitch-conversions/ http://www.britishideas.com/2007/10/17/pitch-conversions/#comments Wed, 17 Oct 2007 19:51:23 +0000 Andy http://www.britishideas.com/2007/10/17/pitch-conversions/ In order to set up the CNC software we need to know the pitch of the leadscrew being used. I found a Pitch Conversions Table to help with this. I have purchased a 6ft 1/4″-20 (20 threads per inch) threaded rod to use as a leadscrew. According to the table this is a pitch of 1.27mm.

With 200 steps per revolution that will give 6.35um per step. Using 1/16 microstepping that should give an average of 0.397um per microstep. However there will likely be a bit of play between the nut on the leadscrew and the leadscrew, eroding this accuracy somewhat. Also the threaded rod and the motor are made to specific tolerances and are not exact.

]]> http://www.britishideas.com/2007/10/17/pitch-conversions/feed/ 0 Another Design http://www.britishideas.com/2007/10/12/another-design/ http://www.britishideas.com/2007/10/12/another-design/#comments Sat, 13 Oct 2007 03:30:36 +0000 Andy http://www.britishideas.com/2007/10/12/another-design/ Build Your Own CNC Router Machine is an interesting site. It described step by step with videos an alternative design. Worth taking a look at!

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