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I'm making a chamber to boil off some Cadmium that is used for brazing silver contacts onto other metals. I UNDERSTAND THE RISKS IN DOING THIS. The amount of Cd is upto 12%, a very small amount, I've a few of these contacts and intend to do them in small batches. The max temperature reached...

I'm making a chamber to boil off some Cadmium that is used for brazing silver contacts onto other metals. I UNDERSTAND THE RISKS IN DOING THIS. The amount of Cd is upto 12%, a very small amount, I've a few of these contacts and intend to do them in small batches. The max temperature reached...

https://www.youtube.com/watch?v=O2qTfvLukkY There are many of these videos, but they all seem to have one end of the axle touching a plate. I know the axle is a rounded ball and only fraction of it actually touches, but that is still open to friction. Would I simply need to have magnetic...

Hi, I'm a bit of an electrical noob. I know the basics of electronics. Why do small metal detectors (pointers) use the powdered ferrite oxide core, but larger ones use air cores? I've also heard that there is an option to have a ferrite core that moves in and out, but this may not be suitable...

Sorry I thought this was for general topics, I didn't see lighting forum. Thanks they're a good size, I have a few of those around, wasn't sure if they were incandescent. Wonder how much heat they produce.

I'm in need of a slimline bulb for my circuit. http://catalog.miniscience.com/catalog/electricity/Light_Bulb.html The bulbs in this link are the type that I seek. Typically 1.5v but I'm flexible around that. I require incandescent bulb for heat creation. Ideally I'd like the bulbs in the link...

Quite perfect sphere. ~95% accurate I guess. In the future I want 0.01mm accuracy. But for now I will be happy with 1.0mm accuracy, for testing purposes.

I was considering making a lopsided drill bit, which is similar. I have some small diamonds handy.

I would really appreciate if someone could name something similar to what I need. A drill bit that expands to create a spherical space at the end of the drill hole (still within the drilled material). Or perhaps a head that can tilt sideways to slowly make an expansive area at the end of the...

The weight of the dynamo I'm getting is 15kg. Thanks.

Here is some more information that I've found out. I need it for a 68Wh battery (12 hour life), how long do you think it would take me to charge? This depends on how strong you are. The average person can do about 120 watts per. Hr. this is 120/12=10Ah. If I multiply my batter 68Wh by its...

Well you see, I won't be riding every day, I'll only ride from a town/village to a very remote location. At remote location, I can set up my bike for recharging over 1-3 days (where I will be walking around, without the need to use the bike). Well I did kind of want something where I could...

Thanks, but I won't be trying to recharge as I cycle around. It will be in the evening after a days light walking. I've found this which I believe may suit my needs: http://pedalpowergenerator.com/products/belt-drive-bicycle-generator-systems/

I was going to use a router, diamond saw or tungsten carbide. But I've been told not to do this as the shavings are likely to explode. (I guess an oxygen free environment/partial vacuum would've been required). The magnet supplier said it would be easier & safer to order the thin discs that I...

Yes, I was considering that I might need to pedal for 8 hours in medium-high gear. But I won't be doing cycling during the day, just some light walking. The days I do cycle will be to get to a civilised area with power supply and then take a bus/train to my next remote location. I'll also have...

It will be a neodymium magnet.

I've got a battery Lithium-ion, 12 hours life, 68Wh. I'm going to use a bicycle to get around, but I'll be in remote areas so need some way to recharge it. Solar power is inconsistent. I've decided to use the bicycle chain removed from the rear wheel and attached to a dynamo, with a little stand...

Hello. I'm going to purchase a large magnet (60x60mm) and cut it lengthwise (it is currently 35mm thick). It's coated in nickle, I need to safely remove this as it could be a danger (to breathe). I'd like to some advice on this. Also I understand I'll need to clamp the magnet on either side as I...