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SMD reflow hot plate with a 200mm x 100mm surface area

After building my 400W 140mm x 70mm SMD hot plate (See SMD Reflow Hot Plate (new version)) I came across an even bigger 500W 200mm x 100mm hot plate. Unfortunately 3D printing a case for this heating element would exceed the size that my 3D printer is capable of. So this build uses a “off-the-shelf” ABS clam shell case.

Heating profiles
The issue with heating up Surface Mount Devices (SMD) is that if heated or cooled too quickly, potentially damage can occur to the device. Also the flux in the solder needs time to activate and any water vapor that may of seeped in needs time to evaporate. This usually requires a soak period for around 90 seconds at 150 degrees Celsius before raising the temperature to around 220 degrees Celsius to melt the solder paste. Thus manufacturers of these components provide heat profiles which you can sometimes obtain from their respective datasheet.

3D printing
All printing is done using a 0.2mm layer height with no supports..

The first 3 layers of “500 - Text.stl” is printed using the front base color and switches to a contrasting color at the start of layer 4.

Heater & Fan Assembly
The case is an 260mm ABS Grey/Black Instrument Case - (L)mm: 260, (W)mm: 190, (H)mm: 80 that was purchased from Rockby Electronics. Two inserts are 3D printed and screwed into the case using 8 x 6mm M4 screws. You will need to create a thread in the studs using a 4mm tap first. The left insert holds a 5A SSR-D3805HK relay purchased from Ali-Express. The right insert holds a 240VAC to 12VDC & 5VDC that I had salvaged from an old VCR. The dual supply voltages are not manitory as the 5VDC supply can be obtained from the 12V supply by adding a 78M05 regulator to the circuit board.”

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