Wednesday, May 9, 2012

Endstops and stepping

Attached X and Y endstops, mechanical switches for now, wiring was trivial.

My X axis does 5000 steps to travel 12 cm with small 8 tooth pulley.  That's 0.025mm per step not 1/4 of a millimeter but 1/40th, no wonder it's slow.  I will change microstepping from 1/16 to 1/2 to gain x8 speed and still keep the resolution at 0.2 mm.

Meanwhile i wonder if my UBW has enough pins for everything.


X axis               2 out
Y axis               2 out
Z axis               2 out
Extruder motor       2 out
Extruder heater PWM  1 out
thermistor analog    1 in
X end stop           1 in
Y end stop           1 in
Z end stop           1 in


Total               13


One spare pin left which can be used to power off the stepper drivers for example.



Tuesday, April 17, 2012

Got the Z axis going

Finally got the Z axis working, looks like 2 stepper drivers i got are busted.  Either defective or I fried them, one is completely silent, the other gives the motors a twitch with gets more violent with more current.
Made a simple GUI to control the motors.  The motion is quite slow probably due to throughput limitations of UBW, i may switch the steppers from from 1/16th to 1/8th or even a 4th and go to more toothy pulleys.

Next thing to mount and test the end stops. 

Friday, March 9, 2012

Exruder meets the chassis






To my surprise i found out that pulleys have different number of teeth, x and Z axis use pulleys with 8 teeth. Extruder uses one with 12, and my sets includes couple more 10 toothed pulleys just to make things more confusing. I could probably switch to those if i want little bit more speed.
Wires are too short for the Y axis motors, and they need extension. Same with extruder motor. Nothing that can't be fixed with little solder.

Friday, November 11, 2011

Body assembly




The body is coming together nicely. I'm giving up on the idea of using salvaged steppers and belts. Time to start ordering electronics...

Monday, July 4, 2011