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Making invisible markings on paper (needs to be not commonly known or easily seen)
Would you go as far as radio isotopes? That could be revealed by photographic paper placed adjacent ...
21-5-2018 at 00:58
by: Twospoons
Mixing Thermoplastics, Equipment and Chemistry?
How about making a cutter to sit at the end of your extruder, turning filament back into pellets. Th ...
20-5-2018 at 13:00
by: Twospoons
Cool electronic devices you can make for thr lab but are uncommon.
And epoxy has a higher expansion coefficient than either aluminium or ceramic, by a factor of two.
...
14-5-2018 at 13:17
by: Twospoons
Cool electronic devices you can make for thr lab but are uncommon.
[rquote=517446&tid=82665&author=coppercone][rquote=517420&tid=82665&author=Ubya]1kW ...
11-5-2018 at 12:35
by: Twospoons
Hot air balloons- What is % O2 inside the envelope?
If you use an electric heater to fill the balloon, then the answer is clearly 21%. I have no idea h ...
8-5-2018 at 14:14
by: Twospoons
Only Half Human
Makes me wonder if we exist for the bacteria's benefit, rather than them for ours. As if we are noth ...
12-4-2018 at 15:25
by: Twospoons
Where does heat go in a battery?
No thats not the vertical label, thats the chart title. Google sheets isn't a great tool sometimes.
...
10-4-2018 at 13:46
by: Twospoons
Where does heat go in a battery?
Ok, so consider a hypothetical battery of 12V, with an internal resistance of 100 ohms, modeled belo ...
10-4-2018 at 13:28
by: Twospoons
What is stronger? Sunlight or artificial light?
Just for fun I thought I'd work out the power flow from a "cooking pot" at 4000C, assuming an emiss ...
8-4-2018 at 23:14
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
The NTE960 should work for you. Its pin compatible with the 7805. The other one wont - it needs a co ...
6-4-2018 at 22:14
by: Twospoons
Robotics - building an dual axis (X,Y) camera mount
I'd go steppers with a microstepping driver, then you only need a home switch instead of encoders. ...
6-4-2018 at 22:07
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
[rquote=513260&tid=81762&author=PiledhigherandDeeper]
Best I can tell is the middle pin con ...
5-4-2018 at 20:56
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
Educated guess is its a 7805 regulator chip, based on the partial part number, and the connections I ...
5-4-2018 at 18:49
by: Twospoons
Analog hotplate: no more rythmic light dimming?
Use LED lighting. Or compact fluoros.
The control circuitry in either one will maintain constant l ...
3-4-2018 at 14:17
by: Twospoons
Making an acrylic büchner funnel
[rquote=512902&tid=81589&author=DrP]Are these acrylics and PLAs solvent resistant? [/rquote ...
3-4-2018 at 14:04
by: Twospoons
Making an acrylic büchner funnel
[rquote=512398&tid=81589&author=aga]
I guess it could all be 3D printed.

Easier as two p ...
2-4-2018 at 13:42
by: Twospoons
The fiberglass or ceramic material used to make heating mantels - what is it?
Carbon fiber is electrically conductive, so you can't use it around a nichrome element.
30-3-2018 at 16:38
by: Twospoons
DIY ramp, soak, pc parameter set up/monitor temperature controller
Nice to see realterm is still developing. I know the author, he was a work colleague for many years ...
30-3-2018 at 16:36
by: Twospoons
metal composites for 3d printing
I was thinking about the usual process for 3d printing in metal - namely laser sintering of metal po ...
21-3-2018 at 18:58
by: Twospoons
DIY ramp, soak, pc parameter set up/monitor temperature controller
[rquote=511113&tid=81301&author=Sulaiman]
but the time consuming part (for me) is the softw ...
18-3-2018 at 12:31
by: Twospoons
DIY ramp, soak, pc parameter set up/monitor temperature controller
Watch out with the max31855 - it does not like having the thermocouple grounded. As I found out with ...
17-3-2018 at 20:10
by: Twospoons
DIY ramp, soak, pc parameter set up/monitor temperature controller
A ramp / soak controller is a more complicated version of a standard temperature controller. Usually ...
17-3-2018 at 18:02
by: Twospoons
DIY ramp, soak, pc parameter set up/monitor temperature controller
The USB interface is achieved most simply with an FTDI usb-serial cable. The drivers are mature, and ...
17-3-2018 at 14:54
by: Twospoons
Colured smoke
If you are trying to see air currents you will want thin streams of smoke, not a room full. If it we ...
16-3-2018 at 14:04
by: Twospoons
Looking for a UK source of aluminium granules for a heat bath
Have you tried a machine shop? They may have aluminium swarf you can try for free.
11-3-2018 at 12:44
by: Twospoons
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