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Old 09-12-2014, 11:29 AM   #1 (permalink)
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Help with RV jack? (JD2 Bender)

Can anyone ID this screw drive RV jack this guy is using on his bender? Found the video and thought this would be a way better mod than a air over hydro ram.

I'm guessing its a leveling jack but I don't have a clue.

Video 1: https://www.youtube.com/watch?v=Lf894k6G_e0

Video 2: https://www.youtube.com/watch?v=QvndFi6vdKI
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Old 09-12-2014, 01:30 PM   #2 (permalink)
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Looks like an actuator off an old "C" band satellite dish
Not a bad idea at all
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Old 09-12-2014, 03:01 PM   #3 (permalink)
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Googled "trailer jack" and I see some that are similar, 15" travel etc.. Pretty neat idea.
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Old 09-12-2014, 07:09 PM   #4 (permalink)
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looks like that would be sweet to automate. JGSTURBO where you at. MOunt a damn servo drive on there, some sort of rotation encoder and rig it up where you put in a bend angle and it just goes...Way easier than hydro
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Old 09-12-2014, 07:51 PM   #5 (permalink)
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Oh man... that looks sweet I think I'm gonna have to try that.
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Old 09-12-2014, 08:13 PM   #6 (permalink)
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Is it strong enough to bend up to 2" x .120 tubing?
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Old 09-12-2014, 08:21 PM   #7 (permalink)
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Is it strong enough to bend up to 2" x .120 tubing?
This is my question... I bet the jack is strong enough, but I'm not sure if the drill will have the ooompf to make it happen?
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Old 09-13-2014, 07:41 AM   #8 (permalink)
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Should be, they can pick a motorhome up and off the ground. Your looking for some like these. I just dont know where to buy them and im fairly sure new would be a big piece of change.

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Old 09-13-2014, 08:01 AM   #9 (permalink)
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That he got it from a junkyard for $8 makes it worth it. But looking at some of the prices for new I'd probably be looking at a ball screw to fabricate my own setup.

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JGSTURBO where you at. MOunt a damn servo drive on there, some sort of rotation encoder and rig it up where you put in a bend angle and it just goes...
^^^ This. Or next SWAG offering perhaps?
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Old 09-13-2014, 08:13 AM   #10 (permalink)
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What about a linear actuator? It's not $8, but it's in the realm of reasonable.

1000-Lb. Capacity ID-Ballscrew Linear Actuator 11.34in. Stroke, Model# ID-BALLSCREW | Electric Actuators| Northern Tool + Equipment

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Old 09-13-2014, 08:23 AM   #11 (permalink)
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A foot of stroke isn't going to get you very far with a bender. And there are likely cheaper options than $330.
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Old 09-13-2014, 08:24 AM   #12 (permalink)
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A foot of stroke isn't going to get you very far with a bender.
Fair point. But they do make them in all different stroke configurations.

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Old 09-13-2014, 08:31 AM   #13 (permalink)
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I have not even bought my JD2 yet.. Anyone know the approx throw length something like this would need? I know the HF Ram is about 18".

Another idea.
Atwood Round A-Frame Trailer Jack - Bottom Mount - Topwind - 14-3/4" Lift - 8,000 lbs Atwood Trailer Jack AT82721

There is an RV salvage yard in Carson city apparently, guess I may take a drive down there in the next few weeks.
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Old 09-13-2014, 09:03 AM   #14 (permalink)
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I like the manual trailer jack in a high LB rating....

Should be pretty easy to use it as is or take the handle off and put a servo drive of some sort on there and make it accurate.
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Old 09-13-2014, 02:22 PM   #15 (permalink)
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I'm not thinking a 1000lbs is enough. The HF jack is 8ton? And it seems to be just enough to bend at a decent speed.
Somewhere on minibuggy.net I remember an RV jack bender...
Slow enough lead screw and the pipe threader I can see this happening.
As far as servos or stepper motors, anything can be relay controlled with an encoder tube angle finder. One needs on that reads the stock as floating zero point then tracks on the tube in the shoe.
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Old 09-13-2014, 04:38 PM   #16 (permalink)
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Looks they will make a jack in any spec Contact Us at Atwood Mobile

They have up to 20K stuff.

Wonder what the max OD on the jack could be and what the minimum travel needs to be. I dont have anything here to measure off of.
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Old 09-13-2014, 04:48 PM   #17 (permalink)
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also I am seeing lots with built in gear drives. Would be perfect. Not super fast depending on power source but being slow, it would be accurate.
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Old 10-03-2015, 11:00 AM   #18 (permalink)
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thought I'd bring this back up with an update. I put a trailer jack on my Jd2 bender, it works nicely! It bent some .120 wall 1.75" HREW using a cordless hand drill, one handed


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Old 10-03-2015, 11:14 AM   #19 (permalink)
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Now that is pretty dang slick. Mount up yourself some sort of permenant drill/pipe threader, and one of the harbor freight momentary foot switches, and you have an awesome quiet, electric hands free setup. Not having to deal with the hydraulics is pretty appealing!
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Old 10-03-2015, 12:12 PM   #20 (permalink)
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It's pretty fast too. Looks to be faster than most add-on air/hydro setups. That pipe threader idea is interesting... Hm.... that might be version 2.0
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Last edited by danielbuck; 10-03-2015 at 12:12 PM.
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Old 10-03-2015, 04:09 PM   #21 (permalink)
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What was the source & cost for the jack?
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Old 10-03-2015, 10:23 PM   #22 (permalink)
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Just take it off your trailer after the wheel gets messed up.
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Old 10-04-2015, 10:50 AM   #23 (permalink)
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What was the source & cost for the jack?
It was a husky brand, I think it might be this one:

http://www.amazon.com/dp/B004OJZDAK/...528360_TE_dp_1


Which ever jack you get, you want something at least 13-14 inches of travel, any less than that, and you might not be able to bend the tube far enough to have room to re-pin the die. Longer than 14" will be fine, but not needed.
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Old 10-04-2015, 06:46 PM   #24 (permalink)
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the original video loosk like a jack for a bed mounted pickup camper.
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Old 10-04-2015, 07:01 PM   #25 (permalink)
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How 'bout grabbing some cheapo rolled acme threaded rod and a couple nuts.
Be pretty easy to do up with a tapered roller bearing for thrust and a spring for return tension.
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