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- sdfgeoff completed the lesson Lesson 2: Drawing Technique in the class Design Sketching Class2 months ago
- sdfgeoff commented on sdfgeoff's instructable Mini Swords for Non-forge Owners2 months ago
- sdfgeoff's instructable A Guide to the Esp8266's Promiscuous (monitor) Mode's weekly stats: 3 months ago
- sdfgeoff commented on sdfgeoff's instructable Papercraft With Blender5 months agoView Instructable »
The link should be fixed now. Thanks for letting me know.
- sdfgeoff's instructable Semi-live Software Music (nothing Other Than a Computer Required)'s weekly stats: 1 year ago
- sdfgeoff entered Semi-live Software Music (nothing Other Than a Computer Required) in the Audio Contest 2017 contest 1 year ago
- sdfgeoff's instructable Botch Bread #1: Flatbread/wraps's weekly stats: 1 year ago
- sdfgeoff entered Botch Bread #1: Flatbread/wraps in the Snacks Contest 2017 contest 1 year ago
- sdfgeoff's instructable Botch Chocolate (Super Easy, Super Good, Super Cheap)'s weekly stats: 1 year ago
- sdfgeoff entered Botch Chocolate (Super Easy, Super Good, Super Cheap) in the Snacks Contest 2017 contest 1 year ago
- sdfgeoff's instructable The Story of a Pendant's weekly stats: 1 year ago
- sdfgeoff entered The Story of a Pendant in the Jewelry Contest 2017 contest 1 year ago
- sdfgeoff commented on sdfgeoff's instructable The Story of a Pendant1 year agoView Instructable »
There we go, I've added another drawing on the last step. The story now has an ending.
- sdfgeoff commented on randofo's instructable Jar Lantern2 years agoView Instructable »
You do have to alter the circuit, you have to remove a capacitor and a diode. There's a nice writeup about the mod here:http://rimstar.org/science_electronics_projects/cfl_powered_by_electric_fly_swatter_racket_zapper.htm
- sdfgeoff made the instructable Jar Lantern2 years agoView Instructable »
I put a tilt-switch in mine so when it's this way up it's on and to turn it off you turn it over.I also didn't have a camera flash circuit, so I used one from an electric flyswat.
- sdfgeoff commented on atarax's instructable shoji-style table lamp2 years agoView Instructable »
Here's a small version: 10cm cubed. Got an LED, powered over USB, checks time over Wifi and acts as an alarm clock.
To halve the strength of the steel you need to get it to 500 - 700 degrees, and a candle burns at ~1000 degrees. So in theory, you could use a candle to heat a bolt up to glowing red so you could forge it. However, there's a reason why people use forges powered by coal, gas, and that is ... safety. In order to heat up the bolt, the air around it has to be hotter than your desired temperature. Paraffin auto-ignites at about 250 degrees. So if you have a candle in a space hot enough to soften the steel, your candle would have long since turned into a flaming puddle.There's also the issue of the thermal output: it would take a long time for a candle to heat up a bolt (A candle outputs about 40W of heat, and steel takes 0.5j to heat one gram up one Celsius. So with 100% efficiency, it takes...
see more »To halve the strength of the steel you need to get it to 500 - 700 degrees, and a candle burns at ~1000 degrees. So in theory, you could use a candle to heat a bolt up to glowing red so you could forge it. However, there's a reason why people use forges powered by coal, gas, and that is ... safety. In order to heat up the bolt, the air around it has to be hotter than your desired temperature. Paraffin auto-ignites at about 250 degrees. So if you have a candle in a space hot enough to soften the steel, your candle would have long since turned into a flaming puddle.There's also the issue of the thermal output: it would take a long time for a candle to heat up a bolt (A candle outputs about 40W of heat, and steel takes 0.5j to heat one gram up one Celsius. So with 100% efficiency, it takes just over a second to heat up a 100g bolt by one degree. To go from 20 degrees to 500 degrees would therefore take around 8 minutes. By the time you allow for the fact that 99.9% of your energy goes around your bolt you'd be there for a very long time).That said, I like the idea of using a bolt, they're a nice source of available material - but I think you'd need a gas torch to work with one. A bolt is likely to be higher quality steel than a nail - I know I put dents into the rail-road track I was using as an anvil while trying to flatten a screw, so make sure you don't ruin your work-surface when hammering on a bolt.