Ooza cnc router, coffee 3d printer, and pen plotter

Ooza is our name for the large CNC rig in the basement. It's capable of basic 2D plotting, as well as soft material extrusion via an attached controllable air pressure regulator. We also have a dewalt router ready to be attached. Reach out to micro or lp for training and usage. (PW ooze)

WIki for RatRig Killerbee (1510?)
3D Model Viewer (wants email for download)

Layout
layout drawing A0 Landscape (electronics left side) work area - 1189x841x95mm.

Tools
Pen holders, sized for sharpies by @LP

Pen Plotting Software
List of pen plotter software

svg2gcode

web: ooze
pi: oozaooze

Ooza plotter toolheads
Motors
Biomaterial Recipes for 3D oozing
OOZA Biomaterials printing log

Ooza plotter toolheads

Pen holders, sized for sharpies

https://cad.onshape.com/documents/a7004339719b8194c98d1ff1/w/2a43afa87741d7d332fc674e/e/eb8e0a1270b5742382a76c5a?renderMode=0&uiState=6902928b3060d2615aa58b48

Motors

LDO-57STH86-3004A

Stealthchop

We set stealthchop motion because its quieter, and we set it from moves as slow as 5mm/s so that we don't get whiplash from switching between stealthchop (voltage-controlled) to maxspread (pwm-controlled) output at high speeds.

Stall Detection

Stall detection gives us virtual endstops on the maximum X and Y, and protection if a toolhead gets stuck on something.

Note! I am not sure if the rated toque should be 3.0A, or 3.0A * 2 because there are two phases in the motor

A rough figure for the minimum speed in full steps per second (M915 H parameter) for which you should be able to get reliable stall detection is given by this formula:

min_full_steps_per_second_for_reliability = 
  steps_per_full_rotation * rated_current
  * (actual_current/(sqrt(2) * pi * rated_torque_nm)) 

steps = 400
rated = 3
actual = 0.8 Amp
pi ‎ = 3.142
sqrt(2) ‎ = 1.414
torque = 2.4 N/m (from 24.5Kg-cm)

actual / (sqrt(2) * pi * torque) ‎ = 0.075

steps * rated * 0.075 ‎ = 90