View Profile: vincemulhollon - The Home Shop Machinist & Machinist's Workshop Magazine's BBS

Yesterday, 07:02 AM

vincemulhollon replied to a thread Power tool batteries DEAD. in General

Note that if you own a small (or large?) generator for other purposes, you still technically own a cordless drill, sorta. My grandfather did this in...

26 replies | 1237 view(s)

05-21-2013, 03:12 PM

vincemulhollon replied to a thread I am a gear noob.. some help please... in General

Why do you want a thread dial anyway? Thinking outside the box might save you a huge lot of unneeded effort. Either that or people are going to...

8 replies | 496 view(s)

05-21-2013, 12:44 PM

vincemulhollon replied to a thread Semi OT - A Cool Demonstration; Why Magnesium Fires are so Dangerous in General

Cutting torch oxy? Yes sounds insane at first glance, but think about it. The problem isn't the Mg turnings burning or the total amount of heat...

25 replies | 1619 view(s)

05-21-2013, 12:31 PM

vincemulhollon replied to a thread Semi OT - A Cool Demonstration; Why Magnesium Fires are so Dangerous in General

Helium's not going to work unless the fire is in the ceiling. Argon would work. The intense heat means intense convection currents means its going...

25 replies | 1619 view(s)

05-20-2013, 10:07 AM

vincemulhollon replied to a thread compressed gas mixtures in General

Critical Pressure. Also two words. And you're not going to like it, something like 50 bar at 125 below C for argon. Assuming you have a way to...

12 replies | 745 view(s)

05-15-2013, 06:35 AM

vincemulhollon replied to a thread OT (sort of) odd question... anyone have info on the "Hexcrawler"? in General

That's too bad. When it first came out and I saw it in Parallax magazine ads I thought they were reselling one of the lynxmotion products but now...

7 replies | 611 view(s)

05-14-2013, 04:28 PM

vincemulhollon replied to a thread Do It Yourselfers / Backyard Inventors in China - interesting photos in General

Yeah that's the situation I was describing where it superficially seems simple but its actually more complicated. For one thing the top of the sub...

32 replies | 3053 view(s)

05-14-2013, 07:59 AM

vincemulhollon replied to a thread Do It Yourselfers / Backyard Inventors in China - interesting photos in General

I looked into this a lot as a kid and a couple issues rapidly develop: 1) Crush strength where the outside is a higher pressure than the inside is...

32 replies | 3053 view(s)

05-13-2013, 10:16 AM

vincemulhollon replied to a thread Do It Yourselfers / Backyard Inventors in China - interesting photos in General

Growing up on a lake I always wanted to build a submarine, but my development plan had numerous stages, starting with a scuba raft/platform, then a...

32 replies | 3053 view(s)

05-13-2013, 09:02 AM

vincemulhollon replied to a thread Stainless steel screws freezing up? What's up? in General

Don't leave me in suspense... is there a better professional product for Al-Stainless and Stainless-Stainless outdoors in the rain for ham radio...

53 replies | 4751 view(s)

05-13-2013, 07:06 AM

vincemulhollon replied to a thread Shop vac recommendations in General

I have probably the same model and experimentation with extension hoses shows that the noise mostly comes from the motor and impeller, the air...

21 replies | 1275 view(s)

05-13-2013, 06:54 AM

vincemulhollon replied to a thread Stainless steel screws freezing up? What's up? in General

The local ham radio guys know a thing or two about sticking stainless steel in aluminum and leaving it outdoors for a couple years and then trying to...

53 replies | 4751 view(s)

05-12-2013, 02:05 PM

vincemulhollon replied to a thread Shop vac recommendations in General

LOL I have the same machine and the marketing always makes me laugh, yeah I've got that on a 10 awg line and a 30 amp breaker LOL its more like a...

21 replies | 1275 view(s)

05-08-2013, 03:13 PM

vincemulhollon replied to a thread Thermal Imaging in General

If its made of matter and its above absolute zero it emits blackbody radiation which has a smooth spectrum that never quite drops to zero (although...

57 replies | 2880 view(s)

05-08-2013, 08:21 AM

vincemulhollon replied to a thread Thermal Imaging in General

Radiation spectrum is mostly continuous but your eyes are really good at detecting the peak "brightest" color. All blackbody spectra never really...

57 replies | 2880 view(s)

05-08-2013, 07:29 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

1) Pure profit. If they could get away with denying warranty because of witchcraft, they'd do it, and you'd have people lighting witches on fire,...

37 replies | 2496 view(s)

05-07-2013, 02:00 PM

vincemulhollon replied to a thread Thermal Imaging in General

Whoa: http://www.flir.com/homedepot/ "FLIR Infrared Camera Rentals - Now at The Home Depot!" Not nearby me, but... Also amazon sells the cam...

57 replies | 2880 view(s)

05-07-2013, 12:21 PM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

100LL ("the blue stuff") is low lead but not by any means lead free. Every aviation ground school has some story about the guy who put 100LL in his...

37 replies | 2496 view(s)

05-07-2013, 11:53 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

"Seems like it would be easier to just rebuild the carbs on small engines every few years." The irony of the whole situation is I've only burned...

37 replies | 2496 view(s)

05-07-2013, 11:44 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

You're doing a solvent extraction using water as the solvent. I don't know the separation fraction but rest assured alcohols have a polar end and a...

37 replies | 2496 view(s)

05-07-2013, 11:11 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

That's a two countries separated by a common language thing. "USP rubbing alcohol" sold in the US by the USP definition must be 2-propanol / aka...

37 replies | 2496 view(s)

05-07-2013, 10:54 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

Vapor pressure of ethanol at 50C is about a third of an atmosphere, so if you have a "suction" or "gravity" feed engine with pure ethanol you could...

37 replies | 2496 view(s)

05-07-2013, 10:26 AM

vincemulhollon replied to a thread Chemical question for EVAN the rocket scientist in General

You forgot to set your location in your profile. Unless you and Evan live in the same Canadian province its going to be tough for him to answer. ...

37 replies | 2496 view(s)

05-07-2013, 10:05 AM

vincemulhollon replied to a thread Way to seal glass to brass? in General

Where I was going with the o-ring idea is o-rings are great at gas sealing but miserable mechanical strength, but epoxy is not so great at gas tight...

14 replies | 826 view(s)

05-07-2013, 07:00 AM

vincemulhollon replied to a thread It's not easy finding electronic parts in General

There are some interesting shipping "hacks" in that digikey ships from just a few miles west of me (a bit more for you IN and MI people) so the...

18 replies | 1026 view(s)

05-07-2013, 06:27 AM

vincemulhollon replied to a thread Thermal Imaging in General

You can buy a thermochromic spray kit specifically designed to spray on circuit boards. You won't like the price! Gold plate solution is only $1/ml...

57 replies | 2880 view(s)

05-07-2013, 06:11 AM

vincemulhollon replied to a thread Way to seal glass to brass? in General

No chance of an o-ring or two?

14 replies | 826 view(s)

05-06-2013, 12:24 PM

vincemulhollon replied to a thread Jet Mill-Drill, wire question. in General

Sometimes. I can think of a couple electrical inspector failure modes for this, most of which probably won't apply, but if at least one does, then...

7 replies | 305 view(s)