This is the E-stop circuit I am going to use when upgrading the cnc-mill to servo control. The idea is to use a wire-OR circuit (series connection of NC switches) for things that cause an E-stop followed by a wire-AND circuit (parallel connection of relays) for things I want to happen at E-stop. The E-stop … Continue reading E-stop circuit
Most of the electronics I've ordered for the lathe has arrived by now. Still waiting for the servo-drive for the main spindle. Bottom left are three switched-mode power supplies: 5V 3.5A (logic etc), 12V 3.3A (brushless amps, E-stop chain, etc), 24V 1.3A (spindle brake) Bottom right are two Chinese 350W 48VDC 7.3A power supplies for … Continue reading Lathe electronics
By popular demand, a schematic which roughly shows the electrical connections of our cnc-mill setup. Most of it fits inside one box (also shown here). The m5i20 I/O connectors are on the left, followed by the optoisolator cards. E-stop chain in the middle, servo-amplifiers and motors to the right. Jog wheel at the bottom. The small … Continue reading Servo setup with m5i20 and EMC2
For a few weekends now I have been 'dry-running' the servo electronics that are going to replace stepper motors on the cnc mill. So far the servos are working in closed loop, I can control the VFD forward/reverse and set the RPM, I can read in a spindle-encoder to verify the RPM and also do … Continue reading PID Tunig
This small PCB is going to sit between the M5i20 optoisolators and the VFD that runs the spindle on the mill. Starting from the lower edge of the card there are three outputs that drive optoisolators on the VFD through BC337 transistors. On the VFD they are wired to Forward Start/Stop, Reverse Start/Stop, and External … Continue reading VFD control board
Some good steps towards driving our cnc-mill with DC-servos taken today. I got the pico-systems servodrives wired correctly, the new 50 kHz PWM m5i20 configuration loaded onto the fpga, and updated my pyvcp test panel a bit. I'm using three 19" rack enclosures. The lower one has a 1.8 kVA transformer, the middle one houses … Continue reading Spinning the DC Servos
I've bought three 19" rack enclosures from fellow cnc-enthusiast Jiri K: My plan is to house the PSU, based on a 230 VAC to 2x30 VAC 1.8 kVA transformer, in the bottom box (I might have to extend the encolsure a little, the transformer should the same as Sauli J:s transformers, about 220x220x120mm). The middle … Continue reading Enclosure for servo electronics
One part of our continuing CNC-mill upgrade is to connect a jog-pendant to the mill which will enable jogging and some other manual controls in EMC2. Here are some pictures and notes of the present status.