Working on the bender

[Doug Krebs]

Had a couple things to figure out, but I'll finish it up on friday and hopefully bend some tube!

http://www.offroadrepublic.com/gallery/albums/albun73/aao.sized.jpg

http://www.offroadrepublic.com/gallery/albums/albun73/aap.sized.jpg

http://www.offroadrepublic.com/gallery/albums/albun73/aaq.sized.jpg

[fbronco86]

you better not be bending any of my tube! haha

[Doug Krebs]

You don't own it yet!:flipoff2:

[Mack84]

Mike speaking: oh yeah i forgot about that hehe

[redcagepatrol]

I like the way you had to stand on a 5 gallon bucket to take the pics...

[Doug Krebs]

Originally posted by redcagepatrol
I like the way you had to stand on a 5 gallon bucket to take the pics...

I also had to hold my arms up in the air and point down! I think you were trying to look at my pee pee!

[Mack84]

this is mike again

how are you going to brace this area. it looks like its going to be a weak point.

[Doug Krebs]

I'm just going to leave it unwelded and not brace it at all:flipoff2:

With the swing arm being a lever the ram won't have to push but a couple hundred pounds. I'm still going to gusset that part though.

[eight]

The cylinder will be pushing a few thousand pounds.

[Doug Krebs]

Originally posted by eight
The cylinder will be pushing a few thousand pounds.

you really think so?? I was thinking max 1000 or 1500

[eight]

Well, they say a 2" cylinder is the minimum size that will work. Most pumps have a 2500 psi max pressure. So 3.14 * 1^2 * 2500 = 7850 lbs of force is about what it would take to bend somethin like a 2" .120" wall tube. And there's probably a reason the protools kit uses a 10 ton cylinder.

[Doug Krebs]

well I guess we'll see if my **** hole contraption works!

[Graystroke]

I don't think it's as simple as that. 7850lbs to bend .120" wall? what kind of moment arm are you using doug. I have know idea what is really going on in thise pics?

[eight]

I was just figuring what the max pressure for a 2" bore cylinder would be because I hear that's the minimun, and I threw out the 2" .120" wall because that's probably more than most people will ever bend. If you want to figure bending moment it gets more complicated yes cause it changes with the angle of the cylinder and arm.

[Doug Krebs]

Think this should do it? Or should I get more creative
http://www.offroadrepublic.com/gallery/albums/albun73/aar.sized.jpg

[Doug Krebs]

Could also make something like thishttp://www.offroadrepublic.com/gallery/albums/albun73/aas.sized.jpg

[fbronco86]

yeah i like that idea. if you were really worried about it go with two braces.

this is a little bit stronger than your idea. yours gets a little thin in the middle.

[Doug Krebs]

Well poop looks like that pump i bought might be worn out. I have to check a pressure screw but if that doesn't do it looks like we might be bending Derek's cage by hand this weekend!

I've got an order for a pump rebuild, but they don't know how fast they can get it!

[Doug Krebs]

Just got a call back, price is 60 for the rebuild and I could have it by Saturday, but it would be $40 for the shipping!

[Graystroke]

You mean NO ONE in H-Town has a pump rebuild kit? There's got to be a place that has one in stock somewhere.

[Doug Krebs]

Lets finish this **** so Jerry can be proud of me for something :flipoff2:

So my supervisor and his boss opened up their own shop to do the same thing we do at the university and half ass hired me. So you might ask, "How does this have anything to do with a bender?" Well we are setting up an 800,000 pound press that they had built.

For the past 2 weeks we have been working on setting it up and starting to get it wired up and the hydraulics plumbed up. It just so happens that something like this requires bending heavy walled tubing for the hydraulic line. I just happened to have part of the equipment to do this.

So my die won't work as the tubing required is 1.25". Darn, they had to buy me a die. I would have rather had a small pipe die for grab handles, etc... but I'm not complaining about a free die.

So this leaves me to finish the hydro part. Tommorow I'll make a huge gusset out of 1" plate and attactment point for the ram. Wednesday morning I'll weld up a half ass cart and weld on the gusset and attatchment point.

We'll be using one of their hydraulic pumps, as mine is still bunk.

[fbronco86]

Lets finish this **** so Jerry can be proud of me for something :flipoff2:

So my supervisor and his boss opened up their own shop to do the same thing we do at the university and half ass hired me. So you might ask, "How does this have anything to do with a bender?" Well we are setting up an 800,000 pound press that they had built.

For the past 2 weeks we have been working on setting it up and starting to get it wired up and the hydraulics plumbed up. It just so happens that something like this requires bending heavy walled tubing for the hydraulic line. I just happened to have part of the equipment to do this.

So my die won't work as the tubing required is 1.25". Darn, they had to buy me a die. I would have rather had a small pipe die for grab handles, etc... but I'm not complaining about a free die.

So this leaves me to finish the hydro part. Tommorow I'll make a huge gusset out of 1" plate and attactment point for the ram. Wednesday morning I'll weld up a half ass cart and weld on the gusset and attatchment point.

We'll be using one of their hydraulic pumps, as mine is still bunk.

Tell robert we need to test this bender while you make me a cage for my bronco.

[eight]

I can tell you how to build a small pipe bending die, its easy, no machining required.

[KrazyKarl02]

It just so happens that something like this requires bending heavy walled tubing for the hydraulic line.

Just a question, and not meaning to be a smart ass or anything.... But why would you not use regular pipe and socket weld 90's? I am not sure that bending tubing like you are doing really preserves it strength for holding pressure? We have bent grease tubing like this that holds ~1500 psi, but anything bigger we just use a hose or socket weld, or if you are a bad ass butt weld connections.

[Sharpe]

Whats a socket weld?

[fbronco86]

Just a question, and not meaning to be a smart ass or anything.... But why would you not use regular pipe and socket weld 90's? I am not sure that bending tubing like you are doing really preserves it strength for holding pressure? We have bent grease tubing like this that holds ~1500 psi, but anything bigger we just use a hose or socket weld, or if you are a bad ass butt weld connections.

Why not use pipe with flanges?

Edit

Robert was a pipe fitter back in the day he should know how to hook that crap up

[Graystroke]

why not just use standard hydraulic line and 90* elbows and standard hydro fittings or flexible hose made a your local bryan ho's?

[Doug Krebs]

The fittings cost something like $40 a pop for 90's. That adds up too a die pretty quickly. Regular pipe can't be used for some reason.

The hydraulic engineer told Robert that abrupt 90's will screw with the velocity of the fluid and make the ram travel at different rates. This would be no bueno for what we do.

Lastly, what do you *******s care? I'm getting a free die and motivation to finish it. :flipoff2:

[KrazyKarl02]

Whats a socket weld?

Once again, not to be a smart ass, I was just curious. A socket weld is a type of fitting, shown below, it has a spot for the pipe to slide into the fitting, and it is easier than a but weld. The pipe kind of goes in like a NPT fitting without threads. The only down side to this is there is a gap on the inside where stuff can build up, so if it has to be clean (food industry) you can't use them.

Regular pipe raised face pipe flanges are usually rated to 150 psi or 300 psi, you can get several 1000 psi flanges but they cost, that is why they are not used a lot on hydraulics.

You probably can't use normal pipe cause one you would have to use schedule 80 or 120 for those pressures and 2 if you used carbon steel it would have to be pickled or you would have to use stainless.

The tubing will probably work, I just had never seen it done that way. But hey, Doug is getting free stuff out of it, let it be.

[Graystroke]

I have seen a lot of those and the threaded ones also at the Co-op on our trucks and ag equipment.

[KrazyKarl02]

How about some pics too???

[Doug Krebs]

The tubing will probably work, I just had never seen it done that way. But hey, Doug is getting free stuff out of it, let it be.

Thats how the pump came plumbed to us. Had 1" and 1.25" tubing that was bent.

[jerryg79]

Have any use for a 3/4" Ball Valve? Its been sitting on windowsill since I moved into this office a year ago. It also doubles as a place to trap flies under as well a hammer.

Part # R850. Make me an offer.

[fbronco86]

The fittings cost something like $40 a pop for 90's. That adds up too a die pretty quickly. Regular pipe can't be used for some reason.

The hydraulic engineer told Robert that abrupt 90's will screw with the velocity of the fluid and make the ram travel at different rates. This would be no bueno for what we do.

Lastly, what do you *******s care? I'm getting a free die and motivation to finish it. :flipoff2:

You have not taken fluids yet? You should know that ****.

[Doug Krebs]

So it works! Although not my hydraulic pump, it bends tube. The pressure gauge read 600psi at the start of the bend on 1.75" x .120 wall hrew.

Only bends about 100* in one shot because of the offset configuration I have. It also flexes the C channel a little.

I'm probably going to make new extended arms out of 1/2" and solve that problem. This will be after bending the tube for the press.

Anyone want to buy some bender arms?

[Doug Krebs]

It lives under it's own power 4 years later! Whats next the corn?

[colman]

ready to help me with the cage yet?

[Graystroke]

pretty!

[DRAGOONRANCH]

I may need to "rent" it from you when I get home in April to try to get the rest of the tube knocked out before TCC. :D

[Doug Krebs]

The valve and pump are now mounted. I need to mill a flat on one of the bolts and buy a steel electric box and mount a switch. Other than that it's done. It's also much faster than I thought.

[agjohn02]

that looks sweet. thats a big cylinder. how thick of wall stuff are you bending again?

[jerryg79]

that's nice and shiney, the methheads will appreciate you taking the time to paint it. :D

looks good, im pleasantly surprised by the lack of loose hoses and wires :gigem:

[Doug Krebs]

that's nice and shiney, the methheads will appreciate you taking the time to paint it. :D

looks good, im pleasantly surprised by the lack of loose hoses and wires :gigem:

None of my expensive stuff will ever go back to the barn...

John, the old stuff we were bending was a little under .2 thick.

I'm not sure what the new stuff will be.

[sasquatch]

looks slick. how much do you have invested in it?

[Doug Krebs]

looks slick. how much do you have invested in it?

don't really want to think about it. More time than anything.

[davido]

Good concept for electric steering on my next hybrid offroad rig. :)

Looks cool.

[Doug Krebs]

Work bought me another die today. 1.5", 4.5" CLR , 240*. Hopefully they'll buy me a 2" and a 1" then I'd be set!

[Sharpe]

No for Dougie but those of us with Jd2's. What say yall?

http://copperheadfab.com/index.php?action=productview&productid=164
+
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200349249_200349249

[davido]

I say get a long lever out and get to pulling. Even skinny punks like you can do it. :flipoff2:

[Sharpe]

Its not that I cant do it its more I dont want to do it :flipoff2:

[RCcola55]

Its not that I cant do it its more I dont want to do it :flipoff2:

neither do I, buy it!

[uglyota]

and if they drill holes in the driveway their landlord's totally keeping the security deposit :D

[CRaSHnBuRN]

No for Dougie but those of us with Jd2's. What say yall?

http://copperheadfab.com/index.php?action=productview&productid=164
+
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200349249_200349249



Any reason not to just use a HF one? Probably cheaper and its got the warranty

[Doug Krebs]

Any reason not to just use a HF one? Probably cheaper and its got the warranty

It is the HF I think. They include the brackets...

[DRAGOONRANCH]

yeah, he had it listed w/ the harbor freight jack at one time.


EDIT:here is the link off of that page.

http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=94562

[Sharpe]

Ah, I couldnt find the HF ram earlier.

[DRAGOONRANCH]

I didn't look at the prices, but I bet the only thing different is the paint job on those jacks.

[Graystroke]

Ah, I couldnt find the HF ram earlier.

did any of y'all by the copperhead fab mount? if so, how does it work w/ the HF jack?

[DRAGOONRANCH]

we ended up getting one from trick tools for Creighton's i believe.