Tools and Tips #2 from Applied Science----make money online

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about this thanks very much I really

appreciate it also on my Twitter feed

you may have seen that I took some

scanning electron micrographs of a CD

DVD and a blu-ray disc and I'll put the

high-resolution images on my blog as

well and put a link in the description

as you can see the fit density is quite

a bit higher on blu-ray and the the jump

or the difference between blu-ray and

DVD is actually quite a bit higher than

DVD and CD the first tool that I'd like

to talk about is this digital angle

gauge as you can see it's just a box

with a digital readout and some magnets

on the bottom and the idea is that you

stick it down to a table saw surface and

zero it and then stick it to the blade

and you can even push it down so that

it's Square to the table and then it

will read off the angle that the blade

is currently at so this is way more

accurate than the bevel gauge that's on

the table saw and it reads off in tenths

of a degree which is super useful

because for doing boxes and those things

that require very tight miter angles you

can really dial it in and get it

accurate it also works really well on

band saws on jointer setups and even on

glue ups where you have a little bit of

flexibility in your jig and you want to

make sure that your glue up is right at

90 pipe threads are sort of a barbaric

way to make a seal but it is cheap and

easy and it does work

with one problem in a standard pipe

thread joint when you screw this

together there will actually be a spiral

leak path that goes around because the

two surfaces don't touch each other the

pipe and the fitting don't actually

touch a hundred percent all along the

pipe fitting so these are actually

designed to be used with a sealing

compound and the job of that compound is

to take up that last little gap between

the pipe and the fitting and prevent the

gas or liquid from taking that spiral

path through the thread gap out to the

outside so one good brand of pipes

ile compound is rector seal this is good

stuff McMaster also sells compounds that

are specifically made for plastic to

plastic pipe joints also you may have

seen or used a teflon tape and a lot of

people will claim that this actually

isn't even designed for sealing pipe

however it does work pretty well and

there's something else you should be

aware of if you buy a standard teflon

tape at your local hardware store you're

likely getting a fairly cheap grade of

it a fairly low density of teflon

however if you buy this from McMaster

for example they sell it in commercial

grade standard military grade and a

premium military grade and know this

actually isn't an $800 toilet seat this

is actually worthwhile the higher the

grade the higher the density of the

teflon so this premium military grade

stuff is a little bit thicker but it's

actually much more dense and so if

you've worked with this tape before the

denser stuff one is just easier to

handle it doesn't stick to things quite

as ridiculously and also if you're doing

large-diameter pipe sealing I find that

the premium grade works a whole lot

better you don't need to use as many

turns and hence you get a better seal

also be aware that there's a different

kind of pipe thread out there that is

designed not to be used with compound

it's called dry seal or NPT F which is

national pipe thread fuel and the

difference is that the major and minor

diameters of this thread are slightly

different than standard NPT so that when

you screw them together there's actually

an interference fit so that the pipe

threads will actually cut into the

fitting slightly and eliminate that

spiral gap the trouble is that if you

put it together and take it apart once

or twice you may not get that good seal

anymore because the interference fit has

already been done once and then when you

take it apart and put it back together

you may not get that so I've had limited

experience trying dry seal without

sealant I usually find it's better just

to go with standard NPT and then use a

sealant of some kind you may not be

aware of it hot glue actually comes in

colors other than translucent and so

black is actually a really useful color

to have in the shop as well on a side

note I don't recommend this brand of hot

glue gun there is a sure bonder on

Amazon that seems the best I've also

tried the 75 dollar model on McMaster

and actually prefer the shure bonder and

so as usual I'll put links to all this

stuff in the description one example of

a use for black hot glue is if you're

doing a project that involves LEDs

coming through a panel like this and you

don't want optical crosstalk between

neighboring LEDs you can use some black

hot glue on the backside and cover that

thing up with something that's optically

opaque so that you don't get crosstalk

also if you're doing any sort of optics

project and you want to seal the box up

this makes a really good light tight

seal for the box this is magnetic viewer

film that made an appearance in one of

my other videos kind of more of a toy

than a tool but it does have some cool

uses this is a magnet from a speaker

that looks like it might be sort of

uniformly actually magnetized but when

we put the magnetic viewer film on it

you can see that it's actually got

sections in it kind of neat also if

you've gotten one of these cheap sort of

printed magnets this is like a flexible

rubberized magnet that came in the mail

you might also think this is very simple

but check out what happens under the

viewer film you can see that it actually

has alternating poles north south north

south in a very rapid sort of pattern

and I've heard a few conflicting

theories as to why these are built this

way one is that the the field sort of

cancel out the farther away you get from

the magnet so since they don't want this

you know demagnetizing credit cards and

affecting you know the mail and all

kinds of stuff if they put north-south

poles here it kind of you know cancels

out so the field dies off very quickly

another theory is that with the

north-south poles so close together if

you put this on a steel object you'll

actually get more adhesion more magnetic

pull force because the magnetic circuit

is shorter because it's you know it's a

short path from north to south

I think I'll talk more about this in a

future magnetics video another cool use

with the film is to sort of spy on

electronics and so this is my cell phone

you can kind of see by waving the film

around that there's something magnetic

going on in the phone and you know it's

not exactly a surprise what it is I mean

there's you know speakers there's a

speaker there

and then at the top is probably the

handset speaker and I think that's

pretty much all this phone has you

should try it on newer cell phones that

have more gizmos than this if you need

to make a bunch of twisted wiring

harnesses a way to save time is to use a

drill to do the twisting so I've just

got these three equal length pieces of

wire and the vise and then chopped up in

the drill and then all you have to do is

just apply a little tension and let er

rip you may find yourself in a situation

where you need to know which side of the

line is hot and which side is neutral in

this case the plug is polarized but you

may suspect it's wrong or you might be

working on an older house that doesn't

have polarized plugs or even a new house

that just doesn't even have plugs

installed yet so here's a quick trick to

figure this out just with a standard

neon tester if you touch one side of the

tester with your fingers and then put

the other side into the socket

you can see there we didn't get a light

but if we move over to this side you can

see the as I put it in and take it out

you can see a flashing a bit there so

what's happening is your body is acting

as a large capacitor and you're actually

getting a tiny amount of current to flow

through the neon tester now remember

that there's a current limiting resistor

in this so don't do this with just a

plain neon bulb or you'll get a really

good you'll know which side of the line

is hot basically if you do it that way

and of course for the safety-conscious

there do exist these testers where you

can just plug this in and it will

diagnose all the possible problems and

so reversed hot neutral open ground on

and on I've always had trouble cutting

large diameter tubing like this is just

soft nylon tubing and it doesn't really

work very well with scissors like this

I've actually broken pairs of scissors

by leaning on them too hard to cut this

and also like heavier duty snips don't

really do a great job because they

aren't sharp enough and so the tubing

just sort of folds over and it doesn't

cut very well and then finally you can

try sort of hacking away at it with a

knife like this but for large diameters

this doesn't work and you'll end up with

a nasty edge

so I recently found a tool on McMaster

that really works super well for this

this is basically a very long razor

blade that comes down on a plastic anvil

like this and it's basically perfectly

suited for cutting soft tubing and so

the amount of control that you have in a

cut like this is really nice it leaves a

super clean edge takes very little force

to cut and you can even just get the

length exactly the way you need it

really quite sweet my dad recently gave

me this switch contact burnisher and

I've used this quite a bit in

refurbishing the scanning electron

microscope and so the idea is that if

you're cleaning an old relayer or a

switch it's a bad idea to use sandpaper

on there because it ruins the coating on

the switch or relay contacts so what you

really want to do is use something like

this burnisher which has just the ever

slightest amount of abrasive quality I

think it's more like a knife iron that

just sort of pushes the metal around and

then follow it up with some contact

cleaner

I like D oxide brand but this is I think

almost about the same stuff you've

probably noticed that most cordless

drill trucks won't close down on very

small drill bits so I actually had to do

quite a bit of searching but I finally

found basically a pin vise that is small

enough and easy enough to use and also

clamps down to zero so that you can grip

really tiny drill bits with it okay see

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