Revision as of 11:55, 5 April 2017

5 thousandths, or .12 mm - is enough to cause trouble. Depth of cut is .12mm for circuits.
See Shapeoko discussion - [1]
Latest Shapeoko uses GT2 9 mm
Most RepRaps use GT2 6 mm

Calculations

Positioning accuracy of GT2 belt - Say 1/2" pulley. Circumference about 40 mm. 200 steps per revolution = .2 mm positioning - but with 16 microstepping RAMPS standard - we get down to 0.01 mm positioning accuracy, or 0.5 thousandths
Chart at [2] shows positioning accuracy of GT2 belt to be 0.0003 - about half that of the RAMPS 16 microstepping standard
The question is - how much does the belt stretch upon motion?
Why is there no resource that states belt stretch as a function of force?
Contact Application Engineering Department - this bible - [3]

@@ Line 1: / Line 1: @@
+*5 thousandths, or .12 mm - is enough to cause trouble. Depth of cut is .12mm for circuits.
 *See Shapeoko discussion - [https://www.shapeoko.com/wiki/index.php/Belts_and_Pulleys]
 *Latest Shapeoko uses GT2 9 mm
 *Most RepRaps use GT2 6 mm
+=Calculations=
+*Positioning accuracy of GT2 belt - Say 1/2" pulley. Circumference about 40 mm. 200 steps per revolution =  .2 mm positioning - but with 16 microstepping RAMPS standard - we get down to 0.01 mm positioning accuracy, or 0.5 thousandths
+*Chart at [http://file.lasersaur.com/docs-thirdparty/The_World_of_Timing_Belts.pdf] shows positioning accuracy of GT2 belt to be 0.0003 - about half that of the RAMPS 16 microstepping standard
+*The question is - how much does the belt stretch upon motion?
+*Why is there no resource that states belt stretch as a function of force?
+*Contact Application Engineering Department - this bible - [http://file.lasersaur.com/docs-thirdparty/The_World_of_Timing_Belts.pdf]