ManseMasher
Regular.
- Joined
- Nov 29, 2014
- Messages
- 463
- Reaction score
- 345
Stir plate complete - works a charm! A very simple 'how to'....
Components:
Box big enough for pc fan - mine is a cigar box from tobacconists - £2 donation to charity of their choice
PC fan!
Neodynium (rare earth) magnet - both the magnet and fan from old computer (free)
12v dc power supply (I had a wifi router upgrade, used supply from the old one - free)
Pack of M6 x 50 bolts/washers/nuts from B & Q - about £4
2 pole rocker switch - Maplins £2.49
Syphon tube, x4 pieces 10mm length (had one knocking around - free)
Strong glue
How to:
Mark hole dead centre of whatever box you are going to use
Drill pilot hole (3mm)
Cut hole big enough to expose most of fan blade (I used 90mm circular cutter borrowed from friend)
Align fan centrally over hole, mark fan fixing holes
Drill holes to take M6 bolts, and countersink
Attach fan to underside of lid, using x4 10mm syphon tubing as anti-vibration dampeners between fan and lid
Drill hole through back of box for power cable, and through front for 2-pole switch
Connect positive from ps cable to one pole of switch, positive from fan to the other
Connect negative from power supply directly to negative on fan
Glue magnet to DEAD CENTRE of fan hub (off centre it will shake itself to death!)
You can if you wish add a variable resistor to start off slow (ensuring the stir bar spins rather than jumps) but I haven't found the need)
Components:
Box big enough for pc fan - mine is a cigar box from tobacconists - £2 donation to charity of their choice
PC fan!
Neodynium (rare earth) magnet - both the magnet and fan from old computer (free)
12v dc power supply (I had a wifi router upgrade, used supply from the old one - free)
Pack of M6 x 50 bolts/washers/nuts from B & Q - about £4
2 pole rocker switch - Maplins £2.49
Syphon tube, x4 pieces 10mm length (had one knocking around - free)
Strong glue
How to:
Mark hole dead centre of whatever box you are going to use
Drill pilot hole (3mm)
Cut hole big enough to expose most of fan blade (I used 90mm circular cutter borrowed from friend)
Align fan centrally over hole, mark fan fixing holes
Drill holes to take M6 bolts, and countersink
Attach fan to underside of lid, using x4 10mm syphon tubing as anti-vibration dampeners between fan and lid
Drill hole through back of box for power cable, and through front for 2-pole switch
Connect positive from ps cable to one pole of switch, positive from fan to the other
Connect negative from power supply directly to negative on fan
Glue magnet to DEAD CENTRE of fan hub (off centre it will shake itself to death!)
You can if you wish add a variable resistor to start off slow (ensuring the stir bar spins rather than jumps) but I haven't found the need)