Suggestion on applicable TRIG book?

rwm said:
I may be wrong but I think the real issue is not how to get the sine or cosine number. The issue is when and how to use trig functions conceptually and practically. i.e. setting up a sine vise. That would be a good tutorial.
Robert
Click to expand...
A sine vise is dead simple. The length between the two rolls is the hypotenuse, and the gage block stack is the opposite. Hypotenuse divided by opposite is the sine. Use a chart or calculator to get the angle associated with the sine value. Or vise versa...
 
Bob Korves said:
A sine vise is dead simple. The length between the two rolls is the hypotenuse, and the gage block stack is the opposite. Hypotenuse divided by opposite is the sine. Use a chart or calculator to get the angle associated with the sine value. Or vise versa...
Click to expand...
Bob, you mistated. The sine is side opposite divided by the hypotenuse.

Sine bars,plates, and vises are easy to use because the hypotenuse is almost always 5" which makes the calculation simple when using trig lookup tables: find the sine for your desired angle multiply by 2 and divide by 10. It can easily be done in your head.

The other two sizes are 2-1/2" and 10", also easy to calculate.
 
No offense guys, i really am impressed...but to read the conversation between you two just really supports my issue. You guys speak of these concepts like....well like an engineer may explain the logic in weight bearing/distribution of a given I-beam in a skyscraper. Its very matter of a fact...meanwhile I'm thinking what the hell is a Sine Roll?!?!....so yeah, i think some refresher courses are in order for me. RWM hit the nail on the head. Not so much that someone should do what he was leading towards, but there are people that don't know when/how a equation comes into play.
 
RJSakowski said:
Bob, you mistated. The sine is side opposite divided by the hypotenuse.
Click to expand...
Oops, my mistake. Backwards, or rather, inverted...
GunsOfNavarone said:
No offense guys, i really am impressed...but to read the conversation between you two just really supports my issue. You guys speak of these concepts like....well like an engineer may explain the logic in weight bearing/distribution of a given I-beam in a skyscraper. Its very matter of a fact...meanwhile I'm thinking what the hell is a Sine Roll?!?!....so yeah, i think some refresher courses are in order for me. RWM hit the nail on the head. Not so much that someone should do what he was leading towards, but there are people that don't know when/how a equation comes into play.
Click to expand...
Here are explanations along with an easy to use, plug-in the digits calculator --FREE.
https://www.subtool.com/st/how_to_set_a_simple_sine_plate_bar.html
 
Bob, I did read and experiment with that sine page. The cause and effect isn't clear yet.
RJ, i like the simplicity of your equation and if it's that simple, in your head kind of math...I'm in. So, if i wanted a 45* angle on a sine bar that is 5" inches in length , how does your "multiple by 2 and divide by 10" work?
45 x 2 =90 divided by 10 = 9? 9 gauge block?
 
GunsOfNavarone said:
Bob, I did read and experiment with that sine page. The cause and effect isn't clear yet.
RJ, i like the simplicity of your equation and if it's that simple, in your head kind of math...I'm in. So, if i wanted a 45* angle on a sine bar that is 5" inches in length , how does your "multiple by 2 and divide by 10" work?
45 x 2 =90 divided by 10 = 9? 9 gauge block?
Click to expand...
OK, say you have a sine bar (or plate) with a 5" center distance between the two rolls. You want to set it for a 30 degree angle.

Put 5.0 in the first box (or whatever YOUR roll to roll center distance is)
Click the angle type as degrees minutes seconds
Enter 30.00.00 in the second box (or whatever angle YOU are trying to set up)

Click the box that says "Calculate Gage Block Stack"

Out comes the answer! The gage block stack needs to be 2.500000" tall (an adjustable parallel set with a micrometer, or other workaround, can be substituted for the gage blocks if you don't have them.}

Does that make sense?
 
Thanks Bob. Yes, replacing the numbers by what they express helps greatly in picturing in my head. I'm a hands on learner, but also visual. A bunch of numbers just doesn't compute.
 
When I was in school, I took a math for trades class. It was a basic algebra, trig, calculus class to introduce people to the concepts and most importantly how to use a calculator to figure the answers.

If at all possible, you might find a class like that. When I took it it was just a couple hours, one night a week Lacking the time, inclination or opportunity, I'm sure you could find a text book from a class like that cheap.

I still have mine and use it occassionally, it is Mathematics for the Trades, a Guided Approach

https://www.amazon.com/Mathematics-...oach&qid=1540349988&s=Books&sr=1-2&ref=sr_1_2


Mine is the 3rd edition, much cheaper if you don't feel the need for the latest and greatest version (like how much has math changed between now and the 1990s...

ebay has a third edition right now for $14. A much nicer price than the $230 Amazon wants for the current edition. Text books are such a bargain. :oops:

https://www.ebay.com/itm/Mathematic...0:g:HUwAAOSwqe1buoC8:rk:3:pf:1&frcectupt=true
 
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