User:Paulne

Plasma/Acetylene Cutter

Ramps 1.4 Heater circuit to be used for oxygen solenoid. Connector is a 6 terminal, screw terminal block. Use bared wire for connection. Solenoid voltage must be same as stepper voltage supplied to ramps board. Typically 12 or 24 volts DC. Media:180px-RAMPS1-3 6pos.JPG

Stepper motors are 425 oz.in 4 volt 2.8 amp. This exceeds the 1-1.5A capability of the ramps Pololu drivers. Decision has been made to use the Powerlolu board at [1] Schematic seems ok(Eagle format). Board file seems unfinished. Powerlolu drive capability is 10A. Media:Powerlolu_web_preview_featured.jpg This board does not directly attach to the Ramps board, but uses 4 wires to attach to one of the sockets that the Pololu board plugs into on the ramps board. Note #1 - This is not very mechanically or electrically stable. Note #2 - The Powerlolu board is not current limited or fused. The power supply to the board should have an inline fuse no greater than 10A.

Use a seperate Arduino Mega for the height control system. Requires a seperate Ramps & Powerlolu board for the z-axis stepper. Requires a custom software sketch in the Arduino to connect Ramps to the capacitive height sensor. Requires some pushbuttons for jog up/down and engage/disengage height feedback. With some custom g or m codes and a serial line between the two Arduinos the attached pc could jog the z-axis and engage/disengage feedback.