Shock mount failure

[david brady]

Hi Greg,



Three gussets, 120 deg apart. On at the top inline with the

shock in tension, two at the bottom are in compression with

each contributing 50% when projected along the axis of

the shock.



David

'02 LXi, NC



timvasqz wrote:

if there are four gussets and two are inline with the shock the
side

two do nothing. In that case the top gusset that sees compression

transfer more force on the bottom gussett that feels tension.



if they place two gussets one each on 22 degrees of the center line

from the shock across the bottom and two at 22degrees off center line

at the top, the force of the shock(action) will be shared equally by

each gusset reducing the stress at the end of either weld.



I have loader arm gussets that have a crease in them that allow the

gussett to flex some. that takes advantage of metals ability to

absord some and not crack.

the mods that have been done strengthen the post which isnt failing.

the plate fails. the point where plate first fails is the part that

allows the metal to peelup. welding the plate to the frame at the top

has no advantage either.

Greg ofTim&Greg

94ptca



--- In "WanderlodgeForum%40yahoogroups.com",
david brady "dmb993@..."

wrote:

>

> One thing to keep in mind is that these shocks don't

> act vertically. My shocks are canted over to almost

> 45 degrees, give or take (probably take a bit, I haven't

> measured the angle). That's part of the problem. The

> mount has an almost 2:1 mechanical lever disadvantage.

>

> On the LXi, along the axis of the shock, which is how the

> forces are acting, there's a gusset in line with the shock.

> call it 10:00, then there's the 2:00 and 6:00 gussets with

> the bottom of the shock pointing at 4:00. I'll see if I can

> dig out a pic.

>

> If you look at the WB version, you'll see that there

> isn't a gusset in line with the shock opposing the rebound

> forces. The WB gussets are at 12:00, 4:00 and 8:00.

> With the shock acting on 10:00. Pete's pic in particular

> shows how that weld bead flowing between the 12 and

> 8:00 gusset broke, right where the forces are the strongest.

> I believe it broke first at this weld bead and then ripped

> the rest of the metal off to the direction of the brake line.

>

> Check for cracks at that weld bead. Wire brush the paint

> off, then repaint.

>

> Now that it's 12:00 I think I'll go to bed...

>

> David

> '02 LXi, NC

>

>

> timvasqz wrote:

> >

> > when I weld in a triangle gussett, I first cut out the right

angle or

> > just dont weld to the point. On the redesign David has I
would

think

> > the gussets are not top and bottom in line with the shock????

> > Gussetts off to the side of the line of the force would allow
for

> > some distortion in place of total metal failure.

> >

> > When you beef one thing up the next weak link becomes
evident.

first

> > thing I do when I crack an arm on a bobcat is realize the
proven

> > limit then weld it back to spec. I just think the problem is
not

in

> > the ride dynamic.

> >

> > "You can jack a bus up.... by jacking a bus up"

> > Greg of Tim&Greg

> > 94ptca

> >

> >

>

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