how do i calculate these hole positions

moss99 · May 29, 2019

Hi all , maths is not my strong point im afraid , could someone tell me how it calculate (in simple terms please ) the position between the centres of these holes (between the 2 red lines )

see attached drawing ..

Erich · May 30, 2019

Square root ( 24^2+14^2) aka Pythagorean Theorem.

plastikdreams · May 30, 2019

All the dims you need are there, work from the part center.

ripperj · May 30, 2019

27.785

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Guest · May 30, 2019

What Erich is alluding to is the fact you have yourself a right triangle. Just Google for the formula as I don't think you can type out exponents and square root signs on a typical keyboard.

johnoder · May 30, 2019

plastikdreams said:
All the dims you need are there, work from the part center.

Indeed - why try and complicate?

Maybe you like to play around with Trig

14/24= tangent of 30.256 degrees

Cosine of that is .86379

24/.86379 = 27.7848mm as in Post #4

DDoug · May 30, 2019

Well then, what exactly does an "CNC Engineer" doo in your country ?

jrmach · May 30, 2019

Cad Cam,
I forgot Trig when I got lazy and decided to get my $ worth from Cad Cam that I bought

kenton · May 30, 2019

digger doug said:
Well then, what exactly does an "CNC Engineer" doo in your country ?

Drives a train on the CnC railroad.

moss99 · May 30, 2019

Ok , got it , thanks guys , mazaks make it too easy ...

LKeithR · May 30, 2019

johnoder said:
...Indeed - why try and complicate?

Yeah. X is +/- 12mm and Y is +/- 7mm. Get the holes in the right quadrants of the circle and you
should be good to go.

And just to clarify, I'm not a CNC guy so is it actually easier to position holes with an angular co-ordinate and the
radius of the circle? I see no reason to figure that out when you've got X and Y...

lionelt · May 30, 2019

moss99 said:
Hi all , maths is not my strong point im afraid , could someone tell me how it calculate (in simple terms please ) the position between the centres of these holes (between the 2 red lines )

see attached drawing ..View attachment 257677

If you type in
right triangle calculator
into Google a calculator will pop up.

crossthread · May 30, 2019

Is it just me or wouldn't it have made things a lot simpler if the person who made the drawings rotate the thing so you could read the hole centers directly?

lionelt · May 30, 2019

crossthread said:
Is it just me or wouldn't it have made things a lot simpler if the person who made the drawings rotate the thing so you could read the hole centers directly?

Maybe an exam question?

awander · May 30, 2019

He asked for the position of the center point between the 2 holes, and almost all of the comments are talking about pythagoras and angles, etc....

Why use trigonometry at all?

Simply add 12 in the X direction, and 7 in the Y direction, to the coordinate of the lower left hole.

BoxcarPete · May 30, 2019

awander said:
He asked for the position of the center point between the 2 holes, and almost all of the comments are talking about pythagoras and angles, etc....

Why use trigonometry at all?

Simply add 12 in the X direction, and 7 in the Y direction, to the coordinate of the lower left hole.

Why do that, when clearly the zero position is the upper right hole? :rolleyes5:

Also, the statement (exact words used) "the position between the centres of these holes" is highly ambiguous, as there are infinitely many "positions" along the red line in between the two hole centers.

I'd personally recommend taking a ruler to your computer screen and reading out how far it is.

edit for clarity

awander · May 30, 2019

BoxcarPete said:
Why do that, when clearly the zero position is the upper right hole?

How do you get that?

fciron · May 30, 2019

He's assigning zero to the upper right hole center because it's where the measurements to the center line originate. He's got you there.

Limy Sami · May 30, 2019

Handy trig calc here Trigonometry Calculator

lionelt · May 30, 2019

Is he just asking for

X12 Y7
X-12 Y-7

how do i calculate these hole positions

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