Dimmer Speed Controller

prusaprinters

<p>The Dimmer speed controller module reshapes the mains AC waveform to control the power delivered to the load, effectively controlling the device's speed or brightness. &nbsp;See manufacturers specifications for limitations.</p><p>The dimmer module is rated at 2KW, hence can easily handle the power tools that I wish to speed control. &nbsp;The tools I have targeted are a Makita 700W portable bandsaw and a Makita 940W belt sander. &nbsp;I will be making two controller units. &nbsp;Both these tools are workbench mounted, so in a fixed location. &nbsp;In addition to the speed control, this controller incorporates an easy to use and convenient power switch assembly.</p><p>To help me create this box design, I have also created a 3D drawing of the dimmer module and shared it on Grabcad.com. &nbsp;See:<br>https://grabcad.com/library/2000w-dimmer-speed-control-module-1</p><p>The controller box incorporates an industrial style on/off switch. &nbsp;I cut excess panelling away from the switch part to fit it into my box design. &nbsp;The switch is supplemented by a lever switch panel that makes turning the switch off SO easy.</p><p>The dimmer speed control is varied by a case mounted potentiometer. &nbsp;Attached to the potentiometer is a custom 3D printed rotary knob. &nbsp;The knob provides analog control over the dimmer speed power. &nbsp;Rotating the knob clockwise increases the power to the connected device, hence increasing it's speed. &nbsp;Rotating the knob counter-clockwise does the reverse and reduces the power to the device.</p><p>The dimmer module is readily available for purchase. &nbsp;I purchased my module from Banggood for about AU$5 (in a batch of 3) from here:<br>https://au.banggood.com/3pcs-2000W-Thyristor-Governor-Motor-220V-Regulating-Dimming-Thermostat-Module-External-Potentiometer-Voltage-Adjustable-p-1604852.html?imageAb=1&amp;cur_warehouse=CN&amp;DCC=AU¤cy=AUD&amp;akmClientCountry=AU</p><p>The industrial switch I used (A$13):<br>https://www.ebay.com.au/itm/144346556314</p><p>The mains power socket I used (A$8):<br>https://www.jaycar.com.au/mains-panel-socket/p/PS4094?pos=12&amp;queryId=3f318274a2de7ff4b7be2e23c4a815cf&amp;sort=relevance</p><p>Here is my 3D printed solution case. &nbsp;The case lid is held in-place by four 3.5x15mm screws from underneath. &nbsp;PCB and switch are secured to the case using miscellaneous 6G, 7G and 8G self tapping screws.</p><p>To make the print result more interesting for the STOP lever part, I do a filament colour swap part way through the print to make the text white, again after 3 layers back to red. The filament colour swap is setup in your slicer software. Setting up the filament colour is easy in PrusaSlicer, other slicers probably, too.</p><p>My print is made in PETG 1.75mm Aurarum white, black and red filaments, with 0.2mm layer height and 15% infill on a PRUSA I3 MK3S printer.</p><p>I hope you can find this print useful, too.</p>