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20th August 2017, 11:47 AM #121
The 30kg was the default for the Sagulator.
Which I thought was the industry standard for calculating sag.
With stacks of books and stacks of magazines.
Pics from my office closet.
Shelf is 16mm x 1300mm+ wide x 345mm deep
Edge strip in the back is 16mm x 95mm
Now wondering if I should edge strip the sides as well?
IMG_1104.jpg IMG_1103.jpgThanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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20th August 2017 11:47 AM # ADSGoogle Adsense Advertisement
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20th August 2017, 01:48 PM #122
Good Morning Barry
I think you have been getting some excellent advice from Ian; as usual.
I have melamine shelves/cupboards up to 25 years old, and I have had sagging problems with spans greater than 900 mm. Usually I use 18 mm HMR rather than 16 mm - thicker is only marginally dearer and HMR does not increase price - extra 2 mm gives more room for the occasional errant screw. The shelves do not sag instantly, but very slowly over time and its irreversible; in some ways the particle board in melamine acts like glass - you think it is a solid but it is really a liquid and very slowly sags!
Ian's advice on battens front and rear seems sound. A rule of thumb is that stiffness increases with the square of thickness - with 32 mm batten on 16 mm melamine you are trippling the apparent thickness - triple thickness increases stiffness nine-fold. Sounds good.
Virtually nothing sticks to melamine - that's why it exists - and I have had no success gluing it reliably. Suggest that you glue and screw battens.
Good Luck
Graeme
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20th August 2017, 04:52 PM #123Woodworking mechanic
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Cant see any need to edge strip the sides unless you are going to load the shelf so high that it can't be supported by shelf pins.
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20th August 2017, 05:20 PM #124
Hi Graeme,
The 18mm was not worth the extra expense.
16mm is the norm. 18mm has to be special ordered.
Could have sworn they wanted another $50 for it.
-----
Had to get my mind off it for a while and escaped to the shed to add some safety features to the cross cut sled.
Got lucky. Bunnings has the 3mm x 900mm x 600mm on sale.
So took it as a sign to purchase it.
3mm was a bit flimsy for me.
so just doubled it by stacking 2 x 3mm.
I think we're catching all the saw dust coming out the kerf opening now.
But still leaves a lot (some) on the top.
One of the YouTube vids shows someone drilled a hole at the top of the kerf cut on the back fence. I'll try that next.
IMG_1110.jpg IMG_1109.jpg IMG_1107.jpg IMG_1106.jpg IMG_1105.jpg
For the shelf,
I can glue particle board to melamine with special melamine to porous surface glue.
Otherwise, to use Titebond,
I can dado off the 16mm of melamine on the bottom back and bottom front to fit the 16mm x 1200mm x 32mm edge support strips.
Leaving a bit of melamine maybe 5mm on the bottom front to protect the melamine side edging.
Would there be a reason they used 90mm instead of 30/32mm in the closet edge strip supports?
i.e. Will 16mm x 1200mm x 32mm edge strip supports sag as well?
Or perhaps 90mm is a standard size?Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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20th August 2017, 09:12 PM #125
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20th August 2017, 09:17 PM #126
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21st August 2017, 08:46 PM #127
IMG_1111.jpg IMG_1112.jpg
Don't like that very obvious join line.
The lady says don't worry about it.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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21st August 2017, 09:03 PM #128Woodworking mechanic
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21st August 2017, 09:34 PM #129GOLD MEMBER
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Instead of melamine coated chipboard side supports use a wide solid timber edgebanding strip as this will give far greater support to prevent sagging and will glue to the raw chipboard much better. The wider the better.
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22nd August 2017, 12:33 AM #130
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22nd August 2017, 05:42 AM #131
5 screws and 5 clamps.
Sure this will suffice.
Will see how they hold up.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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22nd August 2017, 05:44 AM #132
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22nd August 2017, 06:05 AM #133
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22nd August 2017, 10:14 AM #134
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22nd August 2017, 10:18 AM #135
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