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GCAdidas13
05-17-2005, 12:49 PM
http://img202.echo.cx/img202/7435/bbtoplogo28nb.jpg
Red is wood glue
Blue is silicone caulking
Green is a screw

There are three pieces of .75" MDF, viewed from the side. One piece is under the other two, joining and holding them together. The piece on the underside would be around 2" wide.

Would this be strong or not be able to hold? Using a single piece of MDF is out of the question... Is this a good way to combind two pieces of wood to make one?

Thanks,
Brian

mustangowner
05-17-2005, 12:59 PM
It looks ok to me...if its goin to be one side of a box i would put extra bracing on the inside of the box around the area of the joint. :)

2wheeler
05-17-2005, 01:00 PM
The only thing I would change is to use moisture curing urethane (gorilla) glue for the entire joint, then silicone seal the edges after the joint has dried. Predrill all holes, etc.

jacko
05-17-2005, 01:01 PM
depends what the piece of wood is going to be supporting/doing. if you want more strength, make the bottom MDF a bit longer and use 2 screws on each side.(or 4 screws each side if your going to be going 2 screws over the width of the wood, which I would reccomend.)

GCAdidas13
05-17-2005, 01:02 PM
Yeah - there IS blue on the bottom (inside) of the wood joint... over near the edges of the red on the picture.

GCAdidas13
05-17-2005, 01:04 PM
depends what the piece of wood is going to be supporting/doing. if you want more strength, make the bottom MDF a bit longer and use 2 screws on each side.(or 4 screws each side if your going to be going 2 screws over the width of the wood, which I would reccomend.)
Basically what I think I have to do, is build two halves of a box, drop them both in my trunk separately, and then do something like that to screw and glue them together.

jacko
05-17-2005, 01:08 PM
i would trust it as long as it was braced from where the joint meets to the other side of the box wall, or 2 braces angled to the floor or roof or sides of the box from where the joint is.

jacko
05-17-2005, 01:09 PM
(or on either sides of the joint)

amedeuce
05-17-2005, 01:16 PM
All you need to do is glue and clamp those edges together and let it cure overnight.

vosschs
05-17-2005, 02:48 PM
do you have acces to a biscuit cutter? im sure that would work but if you do have access to one id use that, it holds it and makes the joint almost stronger than the mdf itself

GCAdidas13
05-17-2005, 03:17 PM
do you have acces to a biscuit cutter? im sure that would work but if you do have access to one id use that, it holds it and makes the joint almost stronger than the mdf itself
Thats what I like to hear. THX

WheresTheButta
05-17-2005, 03:20 PM
what's a biscuit cutter?

TPABlazer
05-17-2005, 03:38 PM
Biscut cutter cuts a small section out of the wood to fit a small peice of wood into it. with glue it joins the insides of both peices fo wood.

GCAdidas13
05-17-2005, 03:39 PM
my guess is that it cuts wood in a jagged fashion

req
05-17-2005, 03:43 PM
this is a biscuit joint (id make the 'biscuit' larger tho)

http://www.finegtps.com/Images/cagepics/cagebiscuit.jpg

or you can do a tongue and groove (just get the router bits)

http://muextension.missouri.edu/explore/figures/g0550604.gif

here is a bridle joint - pretty similar, but bigger tongue and groove. not sure how well it would work with MDF tho.

http://images.meredith.com/wood/images/161issuepreview/161bridlejoints_bg.jpg

amedeuce
05-17-2005, 03:50 PM
Biscuit joint would be best or even a dado joining if you dont have a biscuit cutter.
Dado joining = more glue area...

amedeuce
05-17-2005, 03:53 PM
Biscuit joint would be best or even a dado joining if you dont have a biscuit cutter.
Dado joining = more glue area...
Edit, If they are end pieces dado or biscuit. If it is long edges, biscuit.

amedeuce
05-17-2005, 03:56 PM
http://gallery.caraudio.com/vg/1/1/0/0/4/untitled.JPG

req
05-17-2005, 04:05 PM
that looks like it would work great with MDF... and you can throw a few of screws thru it to hold it togehter a bit too.

vosschs
05-17-2005, 04:06 PM
this is a biscuit joint (id make the 'biscuit' larger tho)

http://www.finegtps.com/Images/cagepics/cagebiscuit.jpg

or you can do a tongue and groove (just get the router bits)

http://muextension.missouri.edu/explore/figures/g0550604.gif

here is a bridle joint - pretty similar, but bigger tongue and groove. not sure how well it would work with MDF tho.

http://images.meredith.com/wood/images/161issuepreview/161bridlejoints_bg.jpg


the bottom joint would be the best joint, and can be cut with a table saw, im not to sure a circular saw would work




http://gallery.caraudio.com/vg/1/1/0/0/4/untitled.JPG
thats a rabbet joint heres a dado

http://img277.echo.cx/img277/6559/dad5gm.jpg (http://www.imageshack.us)

Moe Lester
05-17-2005, 04:11 PM
Just do it the way you first posted and use titebond wood glue, it will be fine.

amedeuce
05-17-2005, 05:50 PM
Sorry, I did mean rabbit. Not dado. You're right...

THUNDERBIRD
05-18-2005, 10:22 PM
half lap is ur best joint besides some purple haze which is the BOMB

coulthard_west
06-23-2005, 06:46 PM
it looks to me like the joint would definetly be very strong pending on where you are using it. where is it going?

GCAdidas13
06-23-2005, 07:01 PM
Well it was going to be used in my box construction, but i changed my mind and now will be doing a MDF/FG hybrid that will work just as well.