On 2008-09-22, David Merrill wrote:
Look he http://www.fpl.fs.fed.us/documnts/fp.../fplgtr113.htm
and specifically he
http://www.fpl.fs.fed.us/documnts/fp...tr113/ch07.pdf for application
guidance regarding use of lag screws.

This (or any) design idea can't be meaningfully analyzed without at least a
drawing (clear sketch)("worth 1000 words") of the configuration and loading

I do not have a picture at the moment. The cart is made of three 2x12
6 ft long boards (lengthwise boards), and three 36" long 2x12 boards
running perpendicularly to the 6 ft boards, under them.

==============================
###### ###### ######

You are viewing these boards, such that you are seeing the long side
of the top boards (depicted by ========), and only the cross section
of the crossmember board, depicted by ######. If you now turned that T
by 90 degrees, you would see


====== ====== ======
####################

The weldment comprised of a 1/4" plate and eyebolt looks like this

!!
!!
=========

or

/~\
\ /
=~~~=


or

====!!====
==o=!!=o==
====!!====
==o=!!=o==
====!!====

The steel plate is roughly 6x2x1/4. The eyebolt is roughly 2" in
diameter, 5/8" thick. The holes in the 1/4" plate are depicted by
letters "o" on the last picture. They are 5/16" diameter and
accommodate 5/16 by 5" long lag screws.

The top two lag screws are parallel to the grain of the top board.
The bottom two lag screws are perpendicular to the grain of the bottom
board.

I am least concerned about the weld.

i

directions envisioned. I suspect that each of your respondants has
visualized something different. Generally, I too tend to favor bolts with
nuts and washers. When all is said and done, the orientation and integrity
of the proposed weld in the ring could still prove to be the weak link.

David Merrill

"Ignoramus7553" wrote in message
...
I have a wooden cart on casters on which I will have a generator. Its
weight is 1,400 lbs, and the weight of the entire stucture would be
1,600 lbs. This cart may one day be winched into a trailer on
ramps.

To the front of the cart, I want to attach a lifting eye. It is a big
lifting eye with the threaded stem removed, and welded to a 1/4"
plate, which would be attached to the cart by means of four 5/16" lag
screws.

My question is, what is the optimal length of these lag screws. The
wood is regular soft wood. I assume that beyond some length, the extra
grip given by extra length is meaningless.




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