- Thread starter
- #141
Thanks! We're actually working on a rear winch version of this bumper as we speak.
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Sent from my C771 using IH8MUD
Rear bumper design/build
- Thread starter adventr
- Start date
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Most spindles that "do" break---snap at the upper weld / heat fatigue area over time. Given that you have boxed the spindle....you would be much better off with a very limited penetration weld in that upper high fatigue/load area. Not only is there no need for a big weld/multiple welds....but its actually working against the life of that spindle. The weld simply needs to hold it vertically and let the strength of the boxing act as the main horizontal load bearing element.
Cold worked steel is not good for welding applications since the heat will just make the metal lose it's strength (near the weld-basically releasing the tensile stresses of cold working) that was gained through cold-working. Hot worked metal is slightly weaker but more ductile and better suited for welding applications. Hot rolled will be cheaper and keep your bumper costs down while actually ending up being just as strong at the weld as cold rolled.
Cold worked steel is not good for welding applications since the heat will just make the metal lose it's strength (near the weld-basically releasing the tensile stresses of cold working) that was gained through cold-working. Hot worked metal is slightly weaker but more ductile and better suited for welding applications. Hot rolled will be cheaper and keep your bumper costs down while actually ending up being just as strong at the weld as cold rolled.
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- Thread starter
- #143
I'd be willing to bet that when spindles break, it's more due to the fact that the opposite end of the swing arm isn't captured properly. I don't foresee any issues here.
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Agreed
nope- most spindle breaks are "stress/ fatigue" related........and all occur at the uppermost weld which is weakened by the aforementioned reasons. The horizontal loads on a bumper with a swingout of 24"length with a sizable tire/accessories is fairly significant when compared to the effective yield strength of mild steel. whether you use cold rolled or hot rolled- once you hit it with heat from the weld- you are effectively reducing the cold rolled strength back to hot rolled- at the weld.
Its a pretty easy fix given your boxed design at the spindle area which looks good. You really want the boxing to be doing the work relative to the horizontal load...........so just lay down a bead to "hold" the spindle to the boxing and let your design do the work.
Is this 3/16th?
Its a pretty easy fix given your boxed design at the spindle area which looks good. You really want the boxing to be doing the work relative to the horizontal load...........so just lay down a bead to "hold" the spindle to the boxing and let your design do the work.
Is this 3/16th?
^I see what your saying and probably agree with you, but would have to see some computer load video to understand it. If it was mine I would weld it fully around. This seals out rain and debris from getting down into the boxed area and corroding years down the road.
Bumper looks great btw. I hope you will sell these down the road.
Bumper looks great btw. I hope you will sell these down the road.
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- #147
Of course a spindle break would be caused by stress and fatigue. Where would you say that the excess "stress/fatigue" comes from? It comes from the opposite end of the swing-arm not being supported properly. Exactly what I posted earlier.
The end of our swing-arms, opposite of the spindle, will be completely supported once latched.
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I have been thinking a bit lately about an aux fuel and water tank. Then I read the whole thread here and discovered you are contemplating this. Very cool you might fab a combo tank up. In stainless, no less (uber nice for water). Water is always a expo packing issue/hassle due to its weight. Keeping the fuel and much of it water low (CG) and not losing any interior room would be stellar.
I am way jealous of the tig and fab skills and nice equipment. Keep it up.
I am way jealous of the tig and fab skills and nice equipment. Keep it up.
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- Thread starter
- #149
Had a busy day today. LOTS of welding, but everything went together very smoothly. I think we've finally got all of the little kinks and assembly challenges out of the way. Started with a big pile of parts, and worked them into rear winch bumper shell.
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- Thread starter
- #150
Ended the day by loosely setting the bumper in place on the cruiser. Didn't bolt it on or anything, so it's not sitting level.
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- Thread starter
- #152
Haha, that's actually a FJ Cruiser. We're going to have to build bumpers for it next.
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These bumpers are absolutely beautiful. Wish I was in the market.
Thanks! we pretty much have all the little snags worked out now.
Any word on making a high clearance version for the rock junkies???
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- #157
Anything is possible, but it would be pretty far down on the list. Got a lot of other overland related projects that are currently in the works, and need to be finished.
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- Thread starter
- #158
Stainless doctor has been busy with the grinder today!
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- Thread starter
- #159
One more.
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Tim.... excellent work on this bumper.. subscribed... Always wanted a dual tire, winch bumper
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