Solder paste dispenser for less then $5
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Solder Paste Dispenser. Its A Try To Create A Solder Paste Dispenser Using Cheap Components From Aliexpress. I'Ve Got My Inspiration From Https://Www.Thingiverse.Com/Thing:384680 And Design It From A Scratch. The Biggest Improvement Is The Plunger System. You'Ll Need: - Arduino Pro Mini ($1.5 Delivered) - Stepper Motor With A Driver Board 28Byj-48 ($1.74 Delivered) - 5Mm To 5Mm Coupler (1$ Delivered) - M5 Nut - M5 Threaded Rod 73Mm Long - Power Jack - Tactile Button - Wires - Some Self Tapping Screws You'Ll Need A Serial Adapter To Program Arduino. Notes - Connect The Coupler So That Threaded Rod Will Push Against The Shaft Of The Motor; - If You Have To, Adjust The Plunger Scale So It Will Go In To The Housing Without Any Drag; - Since The Uln2003 Have Almost 2V Dropout, Use At Least 7V Power Adapter To Power The Motor. I Use Mine With 9V, But Works Also With 12V; - I'Ve Design It For A Working Length, So I Can Put New Paste In And Extrude All Of It. Should Work With Any Solder Paste, But I Use It With Aliexpress Mechanic Xg-Z40 ($3.5 Each) - Do Some Failing On The Plunger And The Socket, So Its Smooth; - Wiring You Can Figure Out From Pictures And Arduino Sketch - Glue The M5 Nut In The Plunger, So It Wont Come Out During Retraction. If The Socket Is To Tight, Heat Up The Nut. Some Throwbacks: - Its Uncomfortable To Hold. The Motor Is Mounted Far Of Where You Hold It, So Its Unbalanced. - If There Is A Lot Of Solder Inside Syringe, Then The Pressure Builds Up And Need Much More Retraction So Solder Wont Drip Out After Releasing The Button To Improve - Change The Coupler, So The Whole Body Would Be Shorter, Possibly Some Elastic Hose Would Work Fine - Shorten To Body, And Move Motor Closer - Maybe Change The Design So It Would Be Half The Travel, And After Dispensing Half The Paste , Take The Paste Out And Place An Extender For The Plunger. That Way The Body Could Also Be Shorter. - Add A Potentiometer To Change The Speed/Retraction Length. - Design Custom Pcb - Adjust Screw Hole Size And Depth, All Holes For Pcb Mounting. - Software Could Use Some Improvement In The End It Improved The Work To Apply The Solder For Project For Which I Don'T Have A Stencil. Designed Using Fusion 360 Http://A360.Co/2A1Aafl
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