Help me with my Reflow Toster Oven Project

Chat about pick and place machines, reflow ovens, assembly techniques and other SMT tips & trix

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Franklin97355
 
Posts: 23910
Joined: Mon Apr 21, 2008 2:33 pm

Re: Help me with my Reflow Toster Oven Project

Post by Franklin97355 »

That chip to the right of c4 looks like it didn't get quite hot enough. The solder flowed but didn't wet the chip well.

mikeselectricstuff
 
Posts: 164
Joined: Fri Jun 11, 2010 9:21 pm

Re: Help me with my Reflow Toster Oven Project

Post by mikeselectricstuff »

Parts will self-align much better with stencilled paste, as the paste covers the whole pad.
With dispensed blobs of paste, uncovered parts of the pad may start oxidising before the flux in the paste gets to it, so it doesn't wet fully.

Hamradio2008
 
Posts: 110
Joined: Sun Oct 10, 2010 4:37 pm

Re: Help me with my Reflow Toster Oven Project

Post by Hamradio2008 »

Some closeup pictures for your comments and interest. Here are some recent wiring additions to add push button controls (start and stop initiation), led indications (preheat, soak, reflow, cool) and Thermocouple input. Using a CAT5 jack for connection to human interface control board (buttons and leds).
Reflow.Controller.wiring.closeup.1a.jpg
Reflow.Controller.wiring.closeup.1a.jpg (194.07 KiB) Viewed 2600 times
lower right corner is LM7805 attached to enclosure feeds arduino power and power to control box led indication, walwart for 12v relay power

Reflow.Controller.wiring.closeup.2a.jpg
Reflow.Controller.wiring.closeup.2a.jpg (183.92 KiB) Viewed 2600 times
Adafruit T/C board standing on end so as not to obstruct other digital I/O points. Relays in foreground.

Reflow.Controller.wiring.closeup.3a.jpg
Reflow.Controller.wiring.closeup.3a.jpg (194.35 KiB) Viewed 2600 times
Cat5 cable for connection to external pushbutton and led indication control board. Ribbon cable for connection to relay board under Arduino.UNO are 4n35 optocouplers for relay interface.

Hamradio2008
 
Posts: 110
Joined: Sun Oct 10, 2010 4:37 pm

Re: Help me with my Reflow Toster Oven Project

Post by Hamradio2008 »

Utilized a scrap ATX computer power supply enclosure for project, picture...
Reflow.Controller.Box.closeup.4a.jpg
Reflow.Controller.Box.closeup.4a.jpg (175.31 KiB) Viewed 2599 times

Hamradio2008
 
Posts: 110
Joined: Sun Oct 10, 2010 4:37 pm

Re: Help me with my Reflow Toster Oven Project

Post by Hamradio2008 »

Ok, today I have added an external control board with two Pushbuttons and four LEDs...
External.Cntrl.Brd.1a.jpg
External.Cntrl.Brd.1a.jpg (195.79 KiB) Viewed 2546 times
External.Cntrl.Brd.2a.jpg
External.Cntrl.Brd.2a.jpg (177.6 KiB) Viewed 2546 times

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