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Scoop Curve... can I use 4mm instead of 3mm ply

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Maze View Drop Down
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    Posted: 06 July 2019 at 5:25am
!I did search for this via Google and didn't find any old threads on this!

My wood dealer only has 4mm plywood. Can I use this to make the curved part on the super scoop? And should I use 4 layers and make 16mm or 5 layers and make it 20mm?

The original plan says 6 layers of 3mm (18mm).

Any advice much appreciated :)



Edited by Maze - 06 July 2019 at 5:34am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 6:29am
Laminating is tedious. Another way to do the curve is to kerf a board of normal thickness. Basically making a lot of perpendicular cuts with a table saw. 

Google "kerf cut" "kerf wood" "kerf bending wood etc


Then use one sheet of thin ply to cover it. Or make the kerf lines  a part of your soundsystems look Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 6:33am
http://www.speakerplans.com/index.php?id=vitorhd15

This how curve laminating should be done....... with a custom built clamping jig/form. 

I built four hd15, making the curves from 3mm mdf...... wasnt fun. If i ever did something like that again, i would build a jig like vitor.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 9:30am
It is tedious, without a solid former. Once you've made a former it's pretty easy.  

Once laminated into a curve, its insanely strong. 

Ive not made a curve for a scoop.... but i did make a sledge this way!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Maze Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 9:34am
Ok, thanks for the advice. Do you think 4mm make any difference? It's just an extra mm so I'm guessing it isn't a huge problem. But I'm admittedly very inexperienced.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 06 July 2019 at 11:23am
depends on the ply. 

Do some dynamic assessment! Grab a sheet and bend it along its length. If it looks like you can get it close to the radius without feeling like it's going to break,  carry on. 


Edited by JonB67 - 09 July 2019 at 7:47am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2019 at 4:41am
tbh 6x 3 layers or 4 layers of 4 ect wont make make a huge diff imho all will be really strong as its curved and glued  ect, anything over 15mm built up lams will be pretty will be strong enuff tbh also plus your formers that the curve/scoop sits on

I own a monster metal Jig to do the scoop with heavy duty 4x2  battens with heavy duty metal clamps, to clamp the lams down too , so pretty easy for me...will do 4mm ply with ease too

without Jig can get pretty tricky....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulus Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2019 at 9:30am
i would just do a 3 or 4 parts using 18mm ? much better and solid to actually  act as bracing to left and right of the cab when fixed to sides also 

Edited by paulus - 09 July 2019 at 9:34am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulus Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2019 at 9:40am


s

sorry Jay i stole your pic to show what i was going on about lol 


Edited by paulus - 09 July 2019 at 9:41am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2019 at 10:13pm
hahha ye man , cool bro :-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Maze Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2019 at 10:42am
Where do people usually put handle holes on top of the scoop? I've been looking at so many pictures of scoops but most don't show the top of the scoop.

Do people usually leave it without handle holes on the the top? or how?

Thanks for all the replies btw, very helpful :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2019 at 8:55pm
Normally at the top on rear on the box, and in the mouth panel at the front 

so then just tilt over and grab the scoop/box
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