Math help

[Ol'fogasaurus]

A bunch of web sites for math made easy.

http://www.pagetutor.com/trigcalc/trig.html Need to do some trig, here ya go.

http://www.qsl.net/w4sat/dec2frac.htm Decimal to fraction conversion chart.

http://www.sciencemadesimple.com/conversions.html Metric conversion calculator.

http://en.wikipedia.org/wiki/Drill_and_tap_size_chart List of drill and tap sizes.

http://bobmay.astronomy.net/misc/drillchart.htm Dril bit size chart to 1"/\.

http://books.google.com/books?id=NNWf3o ... &ct=result Auto math.

http://www.slotcar.com/drs/gachart.htm Racer's Conversion Chart
Gauge to Inches to Millimeters.

http://www.plasticsmachining.com/magazi ... -HDPE.html Machining HDPE (High-density polyethylene).

http://www.discounttire.com/dtcs/infoTireMath.dos Tire calculator.

http://www.nooutage.com/vdrop.htm Voltage drop calculator.

http://joshmadison.com/convert-for-windows/ Another conversion calculator.

http://www.the12volt.com/ Download wiring diagrams.

Lee

[SCOTTRODS]

Pretty cool stuff, Lee. Some of it, I have... Some of it Just cool new stuff to have... Thanks for that.

[Ol'fogasaurus]

It was the Trig bit I had just discovered that I thought others might use.

Lee

[Max Welton]

I still have a shelf full of Shaum's Outlines. Very usefull.

Max

[aircooledtechguy]

With all this internet info/help, there's really no excuse for kids these days not doing well in math; NONE.

I wish resources like this were available when I was in school. . .

[SCOTTRODS]

With all this internet info/help, there's really no excuse for kids these days not doing well in math; NONE.

I wish resources like this were available when I was in school. . .

No doubt. I would probably have stayed in school a lot longer (Continued education being the thought here)... instead I opted for Tech School and Got my A&P in 14 months. Still had to endure a month of 8 hour days on Physics to get the A&P ("Airframe and Powerplant" for those who are not in the know).

[Ol'fogasaurus]

As I was told several times in my younger years: 'it isn't so much the answer but knowing how to get there' (not perfect quote but very close). During my apprentice period, the ability to work my way through it (they gave me the formula that they wanted me to use, including 'crib') that I was able to get through that part of can do it. I can still... kind of... do it but it takes me so long and is so frustrating as I have forgotten so much of it.

I have been fussing over something lately, loosing sleep, when all of a sudden it dawned to me that there must be a calculator for trig on the web so I went searching for one. Actually I found several but this one was the easiest, cleanest and the first one of the easy type I found. Granted they round the numbers off but in most cases it is adequate for my needs.

I decided to add the other stuff just incase someone else can use some of them.

Lee

[fusername]

and for those of you who need to do some annoying equation over and over and over again, but you can't find a calculator online, remember MS Excel can do lots of powerfull equations including trig, and you can very easily create a complicated "calculator" for common stuff like gearing or compression or whatever. Just type a equals sign = followed by the math you need and shazam. To use other cells (the boxes you type numbers into) as input, just click on them while you are typing and they will be added to wherever your cursor is at that moment.

Example: You want to add two numbers together.
Step 1: type the first number into a cell
Step 2: Type the second number into a different cell
Step 3: In a third cell type =, then click on the first cell, now type +, cliick on the second cell, and hit enter.

now the 3rd cell shows the number the first two add up to. If you change the number in cell one, cell 3 will automagically update. To do fancy functions like trig, just type =cos(40). for example you want to know the displacement of your motor? A1 is stroke in mm, A2 is bore in mm, and A3 is your engine displacement in CCs

Code: Select all

cell column and row              Cell contents
A1                                       69
A2                                       84
A3                                 =3.14*A2^2/4*A1*4/1000

the ^ symbol is how you do exponents so A2^2 is "the value in cell A2 squared"

IF you don't have excel, a free software very very similar called "open office Calc" will do the same things for you.