residentdud
New Member
I'm no expert....but I know there are a few on this site...
Will this fail?
Will this fail?
Will this FAIL!?!?
- Thread starter residentdud
- Start date
johngofast
Over 1,000 Posts
If those welds are good I wouldn't think it would fail under normal conditions, though I would strongly suggest a thicker gauge steel for that support as I could see it buckeling and there will be a good amount of force on it. I'm not an expert in structural support either. [br /]
If you want to add more to the support and don't want to cut those out, maybe double them up and put another one on the back side and weld it. [br /]
The weld on that support doesn't appear to have good penetration.
Interested to see how this turns out.
Might also want to cross support it through the center of the bike if possible.
If you want to add more to the support and don't want to cut those out, maybe double them up and put another one on the back side and weld it. [br /]
The weld on that support doesn't appear to have good penetration.
Interested to see how this turns out.
Might also want to cross support it through the center of the bike if possible.
RedPlastic
make it rain bitches
in short..yes..that will fail, please dont kill yourself on it, and ill leave it at that...
my-79-750-k
Therapy is expensive. Riding is cheap. You decide.
Yes, it will fail. But not because of your welds, entirely. You have no frame support on your shock mounts. In other words, right now you are basically running independent rear suspension on a machine that absolutely has to have a linked rear. If you left it alone and went over a bump, say 10* to one side, you back end would flex on one side, and THEN on the other, causing major wipe-out-age. You HAVE to have some sort of support connecting your rear frame rails, whether it be a piece of round tube for a tail "arch", or a "hoop", or, like me, 2 pieces of flat bar welded in at 45* angles (think a V shape, open end towards the back). Anything in order to keep those rails from flexing independently.
As far as the gussets in your seat pan go, they're thin, and the welds don't look like they're strong enough to support carrying the ass end of the bike. At a minimum, I would use 1/4"-5/16" steel, and put a bit more heat into those welds, it doesn't look like your getting any penetration into the frame. Over (a very short) time, it's going to develop stress cracks and those become bigger cracks, and then you crack your skull.
All in all, I'm not ragging on you, and it looks like it's going to be a very interesting seat build when it's done. I wish you all the best, I just don't want to see someone forget about the safety factor (even if it does look really cool
)
As far as the gussets in your seat pan go, they're thin, and the welds don't look like they're strong enough to support carrying the ass end of the bike. At a minimum, I would use 1/4"-5/16" steel, and put a bit more heat into those welds, it doesn't look like your getting any penetration into the frame. Over (a very short) time, it's going to develop stress cracks and those become bigger cracks, and then you crack your skull.
All in all, I'm not ragging on you, and it looks like it's going to be a very interesting seat build when it's done. I wish you all the best, I just don't want to see someone forget about the safety factor (even if it does look really cool
)
residentdud
New Member
Awesome, thanks for the advice guys,
I welded a piece of 3/8 flat bar across the top ( at the top of each shock ) and next I'll step up the gussets. I actually just started welding so...recipe for disaster...but hopefully not.
I welded a piece of 3/8 flat bar across the top ( at the top of each shock ) and next I'll step up the gussets. I actually just started welding so...recipe for disaster...but hopefully not.
RedPlastic
make it rain bitches
residentdud said:
if your just starting to learn how to weld..please stop what your doing on that frame now!... practice on something else, and build your skill up before you do structrual work on a frame.
crazypj
Split personality, I fake being smart
Yes.
You created a pivot point where the tubes angle down from main frame.
You also welded gussets in wrong place, don't put them in middle of tube.
Look at a stock frame and see how Honda did it. (rear suspension gussets)
You only need 1/16" sheet, if you do it right :
You created a pivot point where the tubes angle down from main frame.
You also welded gussets in wrong place, don't put them in middle of tube.
Look at a stock frame and see how Honda did it. (rear suspension gussets)
You only need 1/16" sheet, if you do it right :
BoneDaddy
Been Around the Block
Hey, professional welder here, put down the stinger... Get some theory under your belt, shadow someone who knows what they are doing, ask lots of questions, practice like crazy, and have a competent welder/fabricator inspect your work before you even think about welding together anything that could kill you. A weld that looks 'solid' to the untrained eye could fail with little effort.
I can't tell from your picture but it looks like you've ground the welds on the tubing? That makes it especially dangerous if you aren't positive that you are getting sufficient penetration all the way around the welds and really isn't a good idea anyway. If they aren't ground, you still run the risk of having what I call 'topical welds' which might look ok but are destined to fail. I see it constantly at work while repairing very nice looking but poorly penetrated assembly welds on equipment.
Be safe.
I can't tell from your picture but it looks like you've ground the welds on the tubing? That makes it especially dangerous if you aren't positive that you are getting sufficient penetration all the way around the welds and really isn't a good idea anyway. If they aren't ground, you still run the risk of having what I call 'topical welds' which might look ok but are destined to fail. I see it constantly at work while repairing very nice looking but poorly penetrated assembly welds on equipment.
Be safe.
residentdud
New Member
Alright guys. Thanks. I guess I got a little too deep over my head here. I'm gunna get it done by a professional, seems to be the safest way to go.
BoneDaddy
Been Around the Block
Good plan but be sure to get whatever tips and knowledge you can from that pro. Also, I'm no engineer but you may want to re-think the position of the forks. Even with those gussets properly welded in place, there's going to be a whole lot of force between the top of the gusset and the fork mount where I've marked in the pic below (and who knows what's become of the integrity of the steel in that area at this point).residentdud said:
