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Chat Area => General Discussion Area => Topic started by: Terbs on 11 October 2013, 12:47:34

Title: Woodwork question
Post by: Terbs on 11 October 2013, 12:47:34
Hi all
This might be an easy fix for the skilled...I am not fully skilled...

Scenario is....I have a 10' x 7' concrete base for a shed. I am making a base for the shed. All the wood I have cut on my electric bench saw/mitre saw. it is all correct lengths.
I have used 25 x 38 timber as bearers, and screwed them together.
How can I make sure this base is square before I start nailing on the boards, and maintain that squareness. The shed has an overlap on all sides, so the base is made exact size.
I would just add, that putting 45 degree corner pieces in would not be foolproof, as I lent my Mitre saw to my son and it has come back in a different state to what it left here !!!!!! >:( ........So I cannot guarantee the exactness of the angles.

Probably stupid question, but whatever :-[
Title: Re: Woodwork question
Post by: jonathanh on 11 October 2013, 12:49:20
measure both diagonals and make sure they are the same length - they should be 12ft 2.5 inches
Title: Re: Woodwork question
Post by: Gaffers on 11 October 2013, 12:58:21
Then fit right angled brackets in the corner that are flush with the woodwork :y
Title: Re: Woodwork question
Post by: Terbs on 11 October 2013, 13:35:17
Thanks guys.....
Just one minor point....the actual shed bearer overall size is 80 3/4" x 83 1/8"

How the heck do you know what the corner to corner measurement is supposed to be...you are a genius :y
Incidently, mine was a inch difference. :(

Tony
Title: Re: Woodwork question
Post by: henryd on 11 October 2013, 13:48:53
Thanks guys.....
Just one minor point....the actual shed bearer overall size is 80 3/4" x 83 1/8"

How the heck do you know what the corner to corner measurement is supposed to be...you are a genius :y
Incidently, mine was a inch difference. :(

Tony


the Measurement is not important,so long as both diagonal measurements are the same its gotta be square
Title: Re: Woodwork question
Post by: bigegg on 11 October 2013, 14:13:59
course, a much easier way is to board the floor with plywood - factory edges are usually square enough that you can square up your beams with the edges of the sheet.
Title: Re: Woodwork question
Post by: Entwood on 11 October 2013, 14:27:12
Thanks guys.....
Just one minor point....the actual shed bearer overall size is 80 3/4" x 83 1/8"

How the heck do you know what the corner to corner measurement is supposed to be...you are a genius :y
Incidently, mine was a inch difference. :(

Tony

Right angle triangle either use Pythagoras theorem or basic trigonometry .. :)

If the sides are 80.75 and 83.125  (80 3/4 x 83 1/8 )

then diagonal is sq rt of  80.75 squared + 83.125 squared .. or sq rt of 6520.5625 + 6909.765625 = sq rt 13430.32813 = 115.8892925 = 9ft  7 4/5 inches

so if both diagonals measure 9 ft 7 4/5 the box is perfectly square .. :)
Title: Re: Woodwork question
Post by: Terbs on 11 October 2013, 14:27:20
Yeah...I appreciate that bigegg, but I have loads of boards here 19mm x 5 " wide, which were the roof of my old shed. Trying to be a good citizen and recycle :y
Title: Re: Woodwork question
Post by: Terbs on 11 October 2013, 14:30:56
Thanks guys.....
Just one minor point....the actual shed bearer overall size is 80 3/4" x 83 1/8"

How the heck do you know what the corner to corner measurement is supposed to be...you are a genius :y
Incidently, mine was a inch difference. :(

Tony

Right angle triangle either use Pythagoras theorem or basic trigonometry .. :)

If the sides are 80.75 and 83.125  (80 3/4 x 83 1/8 )

then diagonal is sq rt of  80.75 squared + 83.125 squared .. or sq rt of 6520.5625 + 6909.765625 = sq rt 13430.32813 = 115.8892925 = 9ft  7 4/5 inches

so if both diagonals measure 9 ft 7 4/5 the box is perfectly square
.. :)

 :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'(

Geez....I went to school in 1952 - 1962......where the 'ell did that lot come from ;D ;D ;D ;D ;D ;D ;D ;D
Title: Re: Woodwork question
Post by: Entwood on 11 October 2013, 14:44:06
You must have done "the square on the hypotenuse is equal to the sum of the squares of the other two sides" .. basic Pythagorus ...   :)  I think I did that at O level in 1965 ... :(
Title: Re: Woodwork question
Post by: aaronjb on 11 October 2013, 14:49:57
Was it still wax tablets for notes back then? ;)
Title: Re: Woodwork question
Post by: Terbs on 11 October 2013, 14:51:50
You must have done "the square on the hypotenuse is equal to the sum of the squares of the other two sides" .. basic Pythagorus ...   :)  I think I did that at O level in 1965 ... :(

Never did 'O' levels..... :-[ :-[
Left school when I was 14 (due to school year dates)
Have heard of the quotation though. As to sussing it....beyond me ;D :y
Title: Re: Woodwork question
Post by: Terbs on 11 October 2013, 14:56:19
Was it still wax tablets for notes back then? ;)

Not digressing from my original post, but....
When I started school it was slates and chalk, till the second class...then pencils. then pen and ink with wooden handled pens and crappy nibs. Last class (aged 10) they invented cartridge pens and we could use them. I have never looked back. ;D
Incidently, biro's were a massive no no.
Title: Re: Woodwork question
Post by: MR MISTER on 11 October 2013, 15:21:16
Thanks guys.....
Just one minor point....the actual shed bearer overall size is 80 3/4" x 83 1/8"

How the heck do you know what the corner to corner measurement is supposed to be...you are a genius :y
Incidently, mine was a inch difference. :(

Tony

Right angle triangle either use Pythagoras theorem or basic trigonometry .. :)

If the sides are 80.75 and 83.125  (80 3/4 x 83 1/8 )

then diagonal is sq rt of  80.75 squared + 83.125 squared .. or sq rt of 6520.5625 + 6909.765625 = sq rt 13430.32813 = 115.8892925 = 9ft  7 4/5 inches

so if both diagonals measure 9 ft 7 4/5 the box is perfectly square .. :)
Or perfectly rectangular. :P
Title: Re: Woodwork question
Post by: Sir Tigger KC on 11 October 2013, 16:46:56
Was it still wax tablets for notes back then? ;)

Not digressing from my original post, but....
When I started school it was slates and chalk, till the second class...then pencils. then pen and ink with wooden handled pens and crappy nibs. Last class (aged 10) they invented cartridge pens and we could use them. I have never looked back. ;D
Incidently, biro's weren't invented.

Fixed!  :P  ;D
Title: Re: Woodwork question
Post by: Rods2 on 11 October 2013, 17:16:09
Was it still wax tablets for notes back then? ;)

Not digressing from my original post, but....
When I started school it was slates and chalk, till the second class...then pencils. then a quill and ink pot with wooden handled penknives to create crappy nibs. Last class (aged 10) they invented cartridge pens and we could use them. I have never looked back. ;D
Incidently, biro's weren't invented.

How do you use an abacus to calculate the diagonals?

Fixed!  :P  ;D

Further fixed!!  :P :P ;D ;D ;D
Title: Re: Woodwork question
Post by: 05omegav6 on 11 October 2013, 18:36:53
Quote
Or perfectly rectangular. :P

A square being a type of rectangle :P :P
Title: Re: Woodwork question
Post by: MR MISTER on 11 October 2013, 19:10:59
Quote
Or perfectly rectangular. :P

A square being a type of rectangle :P :P
A rectangle's not a type of square though.---- ;D
Title: Re: Woodwork question
Post by: Entwood on 11 October 2013, 19:46:03
square as in "square" ... as in "set square" as in all right angles at 90 degrees ... :)

Pedants rule .. :)
Title: Re: Woodwork question
Post by: MR MISTER on 11 October 2013, 19:47:42
square as in "square" ... as in "set square" as in all right angles at 90 degrees ... :)

Pedants rule .. :)
No, Nige. Wind-up merchant, yes. Pedant, definitely  not.
Title: Re: Woodwork question
Post by: 05omegav6 on 11 October 2013, 20:00:45
square as in "square" ... as in "set square" as in all right angles at 90 degrees ... :)

Pedants rule .. :)
Aye ;D

Quote
Or perfectly rectangular. :P

A square being a type of rectangle :P :P
A rectangle's not a type of square though.---- ;D
Exactly... a Square must be squared away ::)
Title: Re: Woodwork question
Post by: MR MISTER on 11 October 2013, 20:10:02
square as in "square" ... as in "set square" as in all right angles at 90 degrees ... :)

Pedants rule .. :)
Aye ;D

Quote
Or perfectly rectangular. :P

A square being a type of rectangle :P :P
A rectangle's not a type of square though.---- ;D
Exactly... a Square must be squared away ::)
A square must be squared away? What? ;D
Title: Re: Woodwork question
Post by: 05omegav6 on 11 October 2013, 20:29:11
 ::) A square 'must' be squared away... all backwards, it naturally already is... equal sides and equal angles, no 'must' about it ;D
Title: Re: Woodwork question
Post by: MR MISTER on 11 October 2013, 20:33:50
::) A square 'must' be squared away... all backwards, it naturally already is... equal sides and equal angles, no 'must' about it ;D
Ahhhhhh....I see :y




No I fickin don't