Whoops - Pirate4x4.Com : 4x4 and Off-Road Forum

FIXXXXAH · 09-24-2002, 03:47 PM

WELL, IT WAS ONE OF THOSE NO COFFEE-UP BEFORE YOUR USED TO MORNINGS, AND WELL YEH I LEFT A BIT LESS REINFORCEMENT ON MY SHACKLES THEN PLANNED....

ITS 3/8 PLATE SO IM NOT THAT WORRIED, AND THE SHACKLES ONLY TAKE STRESS ON THE WEAK PART DURING DROOP, BUT WHAT DO YOU THINK? THIS WAS THE LAST PEICE OF STOCK SO I THINK I'LL RUN THEM FOR NOW...

Jason M · 09-24-2002, 03:50 PM

Run them but bring a spare..

KMAN · 09-24-2002, 03:58 PM

I think you will be all right.

Lets say you have 3/8" edge distance and you said 3/8" plate.

Thats 0.14 sq inches cross section

Assuming 36 ksi steel and appropriate factor of safety

You are looking at about 2500 lbs shear strength for static loading.

Crawl on............

GloNDark · 09-24-2002, 04:04 PM

Quote:

Originally posted by KMAN
I think you will be all right.

Lets say you have 3/8" edge distance and you said 3/8" plate.

Thats 0.14 sq inches cross section

Assuming 36 ksi steel and appropriate factor of safety

You are looking at about 2500 lbs shear strength for static loading.

Crawl on............

whoa, you smart......me not.......

damn that beats the hell out of my "Run it till it breaks commment"

BJ On Roids · 09-24-2002, 05:54 PM

Quote:

Originally posted by KMAN
I think you will be all right.

Lets say you have 3/8" edge distance and you said 3/8" plate.

Thats 0.14 sq inches cross section

Assuming 36 ksi steel and appropriate factor of safety

You are looking at about 2500 lbs shear strength for static loading.

Crawl on............

coyote · 09-24-2002, 09:30 PM

Now figure your going up hill and have a 5000lb rig with most of the weight shifted to the back and your asking for a failure sooner versus later.....redo it correct or shall it fail at 3 am....in the dark......

Eskimo · 09-25-2002, 06:01 AM

Quote:

Originally posted by coyote
Now figure your going up hill and have a 5000lb rig with most of the weight shifted to the back

In that case, the thin area (at the top) won't be taking the stress..

Besides, 2500lbs x 4 is a 2x safety margin...

FIXXXXAH · 09-25-2002, 07:40 AM

MAN, THATS WHY I LOVE THIS BOARD, YOU GET THE GUYS WHO CAN DO PHYSICS

ACCTUALLY, IM NOT TOO WORRIED ABOUT THE SHEER WEIGHT FACTOR, BUT MORE ABOUT THE FATIGUE APPLIED TO THAT AREA BY THE BOLT WHEN THE AXLE IS DROOPING AND WANTS TO TURN THE BOLT DUE TO THE ARC THE AXLE WANTS TO TAKE. IM GOING TO RUN THME AND CHECK PERIODICALLY FOR DEFORMATION THEN PROBOLY MAKE SOME NEW ONES WHEN EVERUTHING ELS IS BUTTONED DOWN.

coyote · 09-25-2002, 07:41 AM

That only applies on level ground....and unless your wheeling at the mall most hill climbs are off camber for me thus shifting the weight to the back and forcing the spring to turn and applying stress to that part....its close but I would rework it in the garage versus the trail....much easier.....

arndog · 09-25-2002, 08:18 AM

kman made a good post but I believe the shear number would be higher but its irrelevant if you read eskimos post which puts your margin of safety pretty high. do what you said run em and see what happens for that matter don't even worry about them. YOu also need to think of how much down force you axle can provide (real life numbers) Im guessing it is no where near 2500 pounds.

arndog

DCruiser138 · 09-25-2002, 11:48 AM

too much fukin math....just fukin slap somne paint on it....and haul ass!!!! it looks ok...just bring a spare if you want. but i think its fine

helocat · 09-25-2002, 12:32 PM

I have always gone by never going less than the radius of the hole. I.E. One inch hole; leave at least half inch of material for spacing to another edge. (End of material, another hole etc.) Not too scientific but a place to start.

In your case, I side with Coyote reworking metal is much easier in the driveway.

rustyb · 09-25-2002, 03:17 PM

a couple of years ago,Nolen ripped the bottom of his frame horn off instead of damaging the shackle or hanger. But then again, we are talking about Nolen. He has some pics of it if you are interested.

KMAN · 09-25-2002, 04:50 PM

Quote:

Originally posted by rustyb
a couple of years ago,Nolen ripped the bottom of his frame horn off instead of damaging the shackle or hanger. But then again, we are talking about Nolen. He has some pics of it if you are interested.

I second that, I would be more worried about the frame horn/stock mounting than a marginal shackle. I just re-worked my rear shackles and was flabergasted out how thin the metal was the hanger mounted to.

09-24-2002, 03:47 PM	#1 (permalink)
FIXXXXAH Registered User Join Date: Feb 2001 Member # 3259 Location: NORTHERN NM Posts: 1,258	Whoops WELL, IT WAS ONE OF THOSE NO COFFEE-UP BEFORE YOUR USED TO MORNINGS, AND WELL YEH I LEFT A BIT LESS REINFORCEMENT ON MY SHACKLES THEN PLANNED.... ITS 3/8 PLATE SO IM NOT THAT WORRIED, AND THE SHACKLES ONLY TAKE STRESS ON THE WEAK PART DURING DROOP, BUT WHAT DO YOU THINK? THIS WAS THE LAST PEICE OF STOCK SO I THINK I'LL RUN THEM FOR NOW... Attached Images __________________ [SIZE=1] "ANYONE WILLING TO TRADE FREEDOM FOR SECURITY DESERVES NEITHER." TUBING AND BUGGIES ARE OVERRATED METRIC ROCKS. [/SIZE]

09-24-2002, 03:50 PM	#2 (permalink)
Jason M Registered User Join Date: Jun 2001 Member # 5286 Location: Vegas Posts: 9,827	Run them but bring a spare.. __________________ DEAR MADAM: THANK YOU FOR YOUR RECENT ORDER FROM OUR SEX TOYS WEBSITE. YOU'VE REQUESTED THE LARGE RED VIBRATOR AS FEATURED ON OUR WALL DISPLAY. PLEASE SELECT ANOTHER ITEM. THAT'S OUR FIRE EXTINGUISHER

09-24-2002, 03:58 PM	#3 (permalink)
KMAN Registered User Join Date: Sep 2001 Member # 6943 Location: Columbus, Ohio Posts: 595	I think you will be all right. Lets say you have 3/8" edge distance and you said 3/8" plate. Thats 0.14 sq inches cross section Assuming 36 ksi steel and appropriate factor of safety You are looking at about 2500 lbs shear strength for static loading. Crawl on............ __________________ are you kidding me?

09-24-2002, 09:30 PM	#6 (permalink)
coyote Registered User Join Date: Feb 2000 Member # 170 Location: Phoenix, Az Posts: 2,529	Now figure your going up hill and have a 5000lb rig with most of the weight shifted to the back and your asking for a failure sooner versus later.....redo it correct or shall it fail at 3 am....in the dark...... __________________ Red Racer I Toyota FJ62

09-25-2002, 07:40 AM	#8 (permalink)
FIXXXXAH Registered User Join Date: Feb 2001 Member # 3259 Location: NORTHERN NM Posts: 1,258	MAN, THATS WHY I LOVE THIS BOARD, YOU GET THE GUYS WHO CAN DO PHYSICS ACCTUALLY, IM NOT TOO WORRIED ABOUT THE SHEER WEIGHT FACTOR, BUT MORE ABOUT THE FATIGUE APPLIED TO THAT AREA BY THE BOLT WHEN THE AXLE IS DROOPING AND WANTS TO TURN THE BOLT DUE TO THE ARC THE AXLE WANTS TO TAKE. IM GOING TO RUN THME AND CHECK PERIODICALLY FOR DEFORMATION THEN PROBOLY MAKE SOME NEW ONES WHEN EVERUTHING ELS IS BUTTONED DOWN. __________________ [SIZE=1] "ANYONE WILLING TO TRADE FREEDOM FOR SECURITY DESERVES NEITHER." TUBING AND BUGGIES ARE OVERRATED METRIC ROCKS. [/SIZE]

09-25-2002, 07:41 AM	#9 (permalink)
coyote Registered User Join Date: Feb 2000 Member # 170 Location: Phoenix, Az Posts: 2,529	That only applies on level ground....and unless your wheeling at the mall most hill climbs are off camber for me thus shifting the weight to the back and forcing the spring to turn and applying stress to that part....its close but I would rework it in the garage versus the trail....much easier..... __________________ Red Racer I Toyota FJ62

09-25-2002, 08:18 AM	#10 (permalink)
arndog Rock God Join Date: May 2000 Member # 764 Location: Seattle, WA Posts: 2,213	kman made a good post but I believe the shear number would be higher but its irrelevant if you read eskimos post which puts your margin of safety pretty high. do what you said run em and see what happens for that matter don't even worry about them. YOu also need to think of how much down force you axle can provide (real life numbers) Im guessing it is no where near 2500 pounds. arndog __________________ 1966 FJ40 cruiser page

09-25-2002, 11:48 AM	#11 (permalink)
DCruiser138 Rock God Join Date: Dec 2000 Member # 2619 Location: kings beach, CA Posts: 1,716	too much fukin math....just fukin slap somne paint on it....and haul ass!!!! it looks ok...just bring a spare if you want. but i think its fine __________________ Dustin Crawford --- OPEN DIFF DEUSH'

09-25-2002, 12:32 PM	#12 (permalink)
helocat Metal-tech'in Join Date: Mar 2002 Member # 10420 Location: Newberg (Portland) OR Posts: 1,554	I have always gone by never going less than the radius of the hole. I.E. One inch hole; leave at least half inch of material for spacing to another edge. (End of material, another hole etc.) Not too scientific but a place to start. In your case, I side with Coyote reworking metal is much easier in the driveway. __________________ Metal Tech Made in the USA! ALL Active duty US Military get 10% off Metal-tech brand – thank you for your service!

09-25-2002, 03:17 PM	#13 (permalink)
rustyb Registered User Join Date: Jul 2000 Member # 1357 Location: St. Francisville, La. Posts: 599	a couple of years ago,Nolen ripped the bottom of his frame horn off instead of damaging the shackle or hanger. But then again, we are talking about Nolen. He has some pics of it if you are interested. __________________ 77 FJ40, 5.7L vortec, soa, shaved 14 bolt rear, stock front housing loaded with some good stuff, and a lot of f***ing dents and rust.

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