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Not that it will likely be cheaper than what you could find at your local junk yard, but if you need a windshield wiper motor for your power hacksaw, you can get one for $19.95 + S/H (in the US anyway) from Burden Surplus...

Use it as mulch. They already do it with recycled tires. I don't know if hockey pucks use carbon black or just some sort of black dye, but bleach may lighten them up, also.

You can get pure nitric acid in pretty small quantities from Sigma-Aldrich (http://www.sigma.com). You have to register and be approved before they will let you order anything, but I think it is no problem getting approved (I'm a chemical engineer, and was approved through work, so I'm not...

I am really impressed by the fifth engine shown in Florian's post. http://www.homemodelenginemachinist.com/index.php?topic=1877.msg14975#msg14975

Does anyone have some rules of thumb, or better yet, mathematical equations covering gamma-type Stirling engines? I want to make one from junk around the house, but I don't want to guess at it. My specific questions are about the volume of the power cylinder (would I just use the ideal gas law...

Just to let you know - I'm from that generation, and can do math quite well, thank you very much... ;) There's a reason they only get $5 an hour. I bought a slide rule when I was in grad school and taught myself to use it. It is a billion times better for conversions from metric to imperial...

I stumbled across this website yesterday... The workshop tips page is pretty good - I especially like the idea to put a magnet in a plastic bag and put it under the piece of cast iron you are machining to collect the dust...

Wow! 2 science questions in a day. There are some factors to determine: How well insulated is your cup of boiling water, and is it on a hot plate of some sort to keep it boiling? We know that the candle is not going to be well insulated, otherwise, it would choke of air and go out. It will...

The number of fan blades has little to do with the mechanical efficiency of a fan. With larger fans, it has a lot to do with economic payoff. A 3 blade fan will move 50% more air than a 2 blade fan with the same pitch and rotational speed, with the tradeoff that it will use 50% more energy to do...

How about a tapered reamer?

The connecting rod is a u-shaped solid piece. The flywheel will connect to the bottom left point by another rod, and the top right end will power the valve wheel. The top end of the connecting will connect to a crank that powers a vertical shaft. That shaft will run perpendicular to the shaft...

Maybe for soldering/welding two rods of the same diameter together?

Ok - I'm working on my first engine. I wanted something that I could build out of the materials and tools I have on hand. I decided on a 'steam' engine... I know; the drawing ain't pretty - but neither will the engine! (I've got an old piece of carbon steel that I found that is going to be the...

I check out this site occasionally - If you have a pickup and live near Dallas, you might want to look at this auction. There aren't any bids yet, so it's sitting at $100 (+5% buyers premium). http://cgi.liquidation.com/auction/view?id=1312500&convertTo=USD Ends on the 2nd.

Has anyone purchased the new Craftsman box wrench set that has the box end turned 90°? I was looking at them, and the idea is to put less strain on your hand. Usually, though, when I'm having that much trouble loosening a nut, I'll get a mallet and give the other end a few whacks. With the end...

Has anyone worked with carbon fiber? Is it machinable? I would imagine there could be some unique applications with it. http://www.hobbylinc.com/htm/mid/mid5744.htm

HFSP27 - Free shipping over $200 through 12/31 - and it can be combined with the 10% off!

They have an 8x14 lathe at Harbor Freight I was considering, but at the price fo the one Marv suggested, I would have some extra money for bits and for barstock.

Thanks, Marv. I will have that on my list...

Okay; I want to get into making model engines... but my garage is desperately short on tools. So... I'm getting my Christmas list together. Assuming my wife and parents will only have $500 or so to spend, what would you guys recommend? I'm thinking a good quality drill press, but would...