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Hello ensemble, recently a friend did propose the build of this plane, from a german magazine (FMT) plan: the SALy. So there was stimulus to put machines at work. I designed all the cut files for wood pieces, writings, grapics and a few 3D printed pieces too. Those include servo tray, nose cone, wing screw base and more to come. Four kits were cut for a club build. The prototype is now almost finished, so I thought about sharing the build here. Best regards, Ric
Hi ensemble, I need some help with an issue related to Solid State Relay. The machine is composed of: - a CNC router/hot wire cutting combo - a chopper board to control stepper motors and Z level probe (parallel port #1) - a supply for wire heating - a breakout board to control two Solid State Relays (parallel port #2, USB for 5V SSR supply) - a Solid State Relay to control the wire heating (DC-DC) - a Solid State Relay to control spindle on/off (DC-AC, 10A) - a spindle (Kress, 4.8A) - control wires are shielded and grounded The machine works well and has several hours of work on its shoulders, both on milling or hot wire cutting. Both control board seems to work properly. The DC-DC SSR works well controlling wire heating The DC-AC works well controlling a vacuum cleaner, even if I set the cleaner at partial power. The spindle works well if I connect it directly to mains supply, at partial speed also. The problem arise when I try to control the spindle with the SSR. If I set the spindle at full speed, with the on board knob, it works well. If I set the spindle at partial speed, revolution speed jumps a lot. Definitely not usable and even dangerous. The bit could break, ruining the piece or worst... If I control the SSR with a LIPO 3S battery, there are no issues. Voltage measured at control line with a multimeter is stable at around 4.2V. (I should find the divider I built several years ago and check the control line feed with a PC sound card oscilloscope) At this point I'm not sure if it is the spindle that creates so much electrical noise, to disturb so much the breakout board, or the line, or the SSR. I tried adding capacitors on the control wire, SSR side, and on USB 5V line on breakout board side, with no noticeable improvement. I tried feeding USB from a wall charger and even another mains supply, no changes. I'm not sure which solution could be the better. Using a FET, as suggested by Tilman (thanks!)? Going for another SSR, maybe a phase controlled one? Changing the breakout board and using a better shielded one? Last one continuing with manual control ... (nooooo...) In the case of the FET solution, should I create a filtered power feed, or just connect it to a suited power supply? A schematics would be helpful. I'm becoming crazy with that and developments suffer from this waste of time Any help will be really appreciated: thanks in advance! Best regards, Ric