Using a squaring rod

[Roy Clarke]

Niki, I made one of the Maskery gadgets. The very very expensive piece of machinery is a chisel to pare the ends so they are the same length. If you want to spend more, you could use a mitre trimmer.

 

[billbeee]

Hi Guys
Here's the sketch I was going to include.

Nibbo, we were talking about rectangles were'nt we?
How will the other gizmo help if you've dropped a clanger and got one side short?

Cheers
Bill

 

[Lord Nibbo]

Nibbo, we were talking about rectangles were'nt we?
How will the other gizmo help if you've dropped a clanger and got one side short?

Cheers
Bill

At least two angles will be confirmed to be 90deg, the other two would read as one with + 90deg and the other - 90deg. with a rod or gauge you wont know which of the four angles is right and which is wrong.

 

[Niki]

Roy
I made 3 of them and failed. I think that maybe the holes for the hinge were not dead center...but, I have very accurate and big triangles

I think that what Lord Nibbo means is something like in the drawing below, the diagonals are the same length but....

 

[Steve Maskery]

Niki
I'm very surprised that you had trouble with the square. It's not sophisticated but very simple and mathematically spot on. It's to do with the corners of a triangle always making 180 degrees. All the matters is that the points line up exactly at both ends, that's all.

It's all to do with the Rule of Thales, the first known philosopher, from when god was a boy, and I really don't know how you could have problems. I do urge you to have another go, its a great tool, and you really do not need fancy machinery. I've used it just today to check a corner that I couldn't get a try-square into because of clamps being in the way.

Cheers
Steve

 

[Niki]

Thank you so much Steve

Oki-Doki, I'll try it again soon and I hope that I shall have good news...

Regards
niki

 

[Nick W]

It's to do with the corners of a triangle always making 180 degrees.

[picky mode]Actually it's more to do with the angle in a semi-circle always being 90 deg.[/picky mode]

 

[Steve Maskery]

[picky mode]Actually it's more to do with the angle in a semi-circle always being 90 deg.[/picky mode]

Well yes, but they are one and the same thing! (Very picky indeed!)

There is one triangle (pivot, short arm, member1, pivot) which equals 180.

There is another triangle (pivot, short arm, member2, pivot) which equals 180.

Together they equal 360.
BUT, triangle 1 is isosceles so two angles are the same, and
triangle 2 is isosceles so two angles are the same, and
the angle at the pivot is 180 (straight line) which accounts for half of the 360

Therefore, the two tri1s plus the two tri2s equal the other 180. therefore one tri1 plus one tri2 equals 90, which is precisely what we have at the corner.

Cheers
Steve

 

[Nick W]

Yebbut my way is quicker

 

[Lord Nibbo]

Hi Niki, to help you make it and I think Steve will agree, start with making the short pointer first then bolt that to a length that is longer both ends than the short pointer. Now using the short pointer trace/mark its outline on both ends of the longer piece, now where you have marked cut off and sand to match the short pointer. Thats it, easy. :wink:

 

[Niki]

Lord

I made it exactly as you described...and for some reason, failed 3 times

I think that both holes, on the short and long parts must be at the dead center of the width....when you draw a line, the width of the pencil is same like the width of the levers but when it is say (I'm exaggerating), 50mm wide lever, if the hole on one or both levers will not be at the dead center, you will get a mistake...I think...

But let's try tomorrow..

niki

 

[Steve Maskery]

Niki
I'm interested to know why you think you failed three times. How are you measuring whether or not it is accurate?
Cheers
Steve

 

[Niki]

Hi Steve

I have a few very accurate triangles (you can see them in my various posts and especially on the "Triangle - Copy and Past" post.

I put the triangle on the workbench and clamp on both sides (of the 90°) fences (straight edge or even straight boards) and checked....

niki

 

[Steve Maskery]

Then I don't have an answer (at least, not one you want to hear! )

But maths is maths.

Steve

 

[Niki]

Hi Steve

As I promised, I made it again and this time it was a success.

Thank you for the idea and for encouraging me to try it again

Best Regards
niki

 

[Steve Maskery]

:lol:
=D> =D> =D> =D> =D> =D> =D>

 

[jmk89]

niki

Do you know why this one worked and the previous three didn't?
Was it the centring of the pivot?

Cheers

Jeremy

 

[Woodmagnet]

Niki, considering all the wonderful things you come up with
i thought this would have been the easiest thing
for you to make. :shock: Let's just say you were having a bad day. :lol:
I'm worried about trying it myself now. :? :lol:

 

[Niki]

Thank you

Jeremy
Welcome to the forum
I think that it was because of un-centered pivot, but, I'm not sure

Kevin
Lets say that I had a few bad days :lol: ...I made it 3 times without success

Regards
niki