Re: Buildlog.net Open Source Laser
Posted: Tue Feb 09, 2010 7:48 pm
Comment From Buildlog Author
buildsomething wrote:Something still doesn't make sense here. A smaller pulley does not increase resolution unless it works in conjuction with another pulley that is much larger. If the driver and driven are the same diam, no matter how small or how fine the pitch that is used, the resolution is still the same.
In my cutting laser I have a 3:1 reduction from stepper to the driven ass'y. This reduces my speed by 3X, increase my torque available by 3X and increases the resolution by 3X. In my case, I didn't need speed. I can move my 5lb gantry at speeds over 800 ipm which is way way to fast anyway for cutting.
Richard
In my simple system the motor is driving the pulley which drives the belt attached to the moving part. So all I care about is diameter of the pulley on the motor. It is actually calculated in teeth, so the fewer teeth per rev (smaller dia.), the higher the resolution.