Thread: measuring the male dovetail

Hi Richard,
i'm not even going to try to work it out, try this program, it does all the hard work for you.

http://home.scarlet.be/mini-draaien-...rogram-01.html

Ew

I think it should be T=S-(D*2.732), giving you 1.317"

The shop calc says.......1.317".....

Ew

For the "Other crap", I got (A stupid answer because I have fat fingers)

I did it as 1+(1/tan(30))

Originally Posted by scottyd

For the "Other crap", I got 1.01135.

I did it as 1+(1/tan(30))

You need to use cotan not tan, most calculators don't have cotan, to use tan you just have to use the supplementary angle, so 60 not 30.....

Ew

Originally Posted by eskimo

I have a problem with the formulae shown here

https://www.google.com.au/search?q=m...ml%3B324%3B268

T=S-D * (2.732)

If S is 2"
D is .25"
and the other crap is 2.732 for a 60 degree cutter

how can T be bigger than S

what am I missing here...besides my marbles

T isn't bigger than S???
If you continue D times 2.732 = .683
so T = 2 - .683 = 1.317

the order you do the math functions in * then / then + and then - (unless there are brackets)

Originally Posted by Ueee

You need to use cotan not tan, most calculators don't have cotan, to use tan you just have to use the supplementary angle, so 60 not 30.....

Ew

cot(n) = 1/tan(n)

I just realised I pressed the wrong button twice in a row for my previous post, so the "other crap" is correct. Ill remove my previous post...

Originally Posted by _fly_

T isn't bigger than S???
If you continue D times 2.732 = .683
so T = 2 - .683 = 1.317

the order you do the math functions in * then / then + and then - (unless there are brackets)

Thanks fly

seems I was missing something...an education in maths and parenthisis..is that the word?

I like you formulae better Ueee...i knew that the bit in brakets must first be worked out on the order of the other stuff (didnt know might be better answer, but I am sure I was told at some stage but probablymust have been talking at that moment)

Originally Posted by scottyd

cot(n) = 1/tan(n)

I just realised I pressed the wrong button twice in a row for my previous post, so the "other crap" is correct. Ill remove my previous post...

Well that would be why its not on most calculators.....thanks, i'll try to remember that!

Ew

Originally Posted by _fly_

T isn't bigger than S???
If you continue D times 2.732 = .683
so T = 2 - .683 = 1.317

the order you do the math functions in * then / then + and then - (unless there are brackets)

BODMAS is how you remember it. However a common misconseption is to consider every item in this exact order. I am not sure how much difference it makes but a better way to represent it would be BO(DM)(AS) where the functions in brackets should be performed in the order they occur in the formula. ie It does not matter whether you divide or multiply first. You get the same result. 6*3/2=9 3/2*6=9 Ditto with add/subtract.

Brackets (parenthesis)
Order
Division
Multiplication
Addition
Subtraction

Cheers

Dean

Originally Posted by Oldneweng

BODMAS is how you remember it. However a common misconseption is to consider every item in this exact order. I am not sure how much difference it makes but a better way to represent it would be BO(DM)(AS) where the functions in brackets should be performed in the order they occur in the formula. ie It does not matter whether you divide or multiply first. You get the same result. 6*3/2=9 3/2*6=9 Ditto with add/subtract.

Brackets (parenthesis)
Order
Division
Multiplication
Addition
Subtraction

Cheers

Dean

how am I gunna remember that..lol