LumberJocks

large bracket glue up

  • Advertise with us

« back to Designing Woodworking Projects forum

Forum topic by woodstuff posted 11-26-2009 04:49 PM 1280 views 0 times favorited 4 replies Add to Favorites Watch
View woodstuff's profile

woodstuff

6 posts in 2564 days


11-26-2009 04:49 PM

Topic tags/keywords: question pine victorian

My latest project is building two large (40” x 48”), decorative/structural, brackets that support a porch overhang on an old Victorian home. I have copied the front porch bracket and enlarged them for my template. I intend to edge glue three 2×12’s (SYP), three layers thick (4.5”) . The question is do I run the grain in the same direction or alternate the grain in the three layers, ( like ply wood).
all responses appriciated.

WoodStuff

—Woodstuff Houston Texas

-- Woodstuff Houston Texas


4 replies so far

View JJohnston's profile

JJohnston

1614 posts in 2752 days


#1 posted 11-26-2009 05:14 PM

something wrong here

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View JJohnston's profile

JJohnston

1614 posts in 2752 days


#2 posted 11-26-2009 05:16 PM

Can you give us some clarification? Can you post a picture of the front porch bracket so we can see what you mean?

1. Do you mean “face glue” rather than “edge glue”? (I think so, since you say it’s going to be 4.5” thick)

2. It sounds like these are going to be struts, 4.5” thick and about 10” to 11” wide, placed at about 45 degrees from the wall to the overhang?

If my interpretation is correct, don’t alternate the grain, run it lengthwise in all 3 boards. These members will mostly be in lengthwise compression, and that’s the way wood is strongest. Also, if my interpretation is correct, you won’t have a continuous center layer if you alternate the grain – it will be made up of 11” (or so) wide sections of 2×12. Pieces arranged this way won’t have very good shear strength, and these members will have a lot of shear stress in them in addition to the lengthwise compression.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View patron's profile

patron

13535 posts in 2801 days


#3 posted 11-26-2009 05:19 PM

i’d keep all the grain the same ,
for expansion/contraction .
their annular rings alternating ,
will give the strength you need .

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View cabinetmaster's profile

cabinetmaster

10874 posts in 3018 days


#4 posted 11-26-2009 08:06 PM

I have to agree with Bentlyj. That will give you the most strength and sheer factor.

-- Jerry--A man can never have enough tools or clamps

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com