Instructables

Evolution of a ring bender / ring roller machine

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Picture of Evolution of a ring bender / ring roller machine
I read an interesting instructable about a metal bender and then I saw the most interesting photo of a theatrical workshop tool. I formulated an idea and it quickly turned into a new tool.

Step 1: Preparing the vice

Picture of Preparing the vice
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I am only planning to bend aluminum and galvanized steel wire so I don't need a hydraulic jack and I know that drill press vices can be had for about $20. I decided to go get one and look for a roller of some kind at the same time. I ended up using a marine rubber roller. I assume they are used for ropes. It is hard rubber about 12in long and 2 inch in diameter with a 3/4in hole in the center. I figured it was about perfect to put a roller from a laser printer in the center.

The drill press vice comes with a puny piece of steel holding down the floating jaw. In my case I need a lower support for my roller so I needed to upgrade it. I found an old clamp piece from a bed frame that I had saved. It was solid and fit the bill nicely.  In addition to the rollers I also had some brass bushings and plastic bearings. I used a short piece of aluminum track and a little UHMW plastic to house the bushings. At the end I drilled down through my new hold-down plate. This will take all the forward thrust when I tighten the roller on the workpiece. Essentially this pushes the upper bearing back against the floating jaw.

If you don't have that I suggest you use an angle iron on the jaw like the original picture and then drill down through both to support your roller. A vice and a step drill bit make this operation a lot easier. A drill press is best but a vice is essential when drilling metal. Never attempt to drill metal without one.
 
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sconner12 years ago
If you flip the jig over so the center rolled comes down on the work, it will bend upward. Allowing you to place the jig on the floor and the work size is only limited by overhead space.
jds1969 (author)  sconner12 years ago
You are correct. I was just looking for a quick way to get going but that would have worked fine as well. I would have made a base plate or something for it to stand up on its end. Thanks.
juliadee2 years ago
A "vice" is a bad habit. A "vise" is a tool for clamping things.
aaah, Juliadee, I too was gonna correct you and say that in the UK we call it a vice. Then I noticed he calls Aluminium "Aluminum" and decided you were probably right :-D LOL
:-)
jds1969 (author)  juliadee2 years ago
Very witty.
jds1969 (author)  juliadee2 years ago
From Wikipedia:

A vise or vice (see American and British English spelling differences) is a mechanical screw apparatus used for holding or clamping a work piece to allow work to be performed on it with tools such as saws, planes, drills, mills, screwdrivers, sandpaper, etc. Vises usually have one fixed jaw and another, parallel, jaw which is moved towards or away from the fixed jaw by the screw.
derte84 jds19692 years ago
Nerdy answer, love it!
jds1969 (author)  derte842 years ago
Well......it's not Facebook! :-)
pastorboy02 years ago
Neat project, one thing to note though: Aluminum doesn't work harden, it fatigues when subject to stress. The steel probably isn't retaining shape because it has some spring in it. If you anneal it with a torch (time and temperature vary with differing kinds of steel), it will retain its shape much better.
Who told you aluminium doesn't work harden? Strain or work hardening is one of the principle methods of strengthening aluminium alloys, especially those that can't be aged or heat treated. H-series alloys are all work-hardening, T-series alloys are hardened through heat treatment and aging (natural or artificial). Aluminium will certainly fatigue when subject to cyclic stress, but most metals will also. In fact, work hardening alloys are at potentially greater risk of fatigue failure due to localized over-hardening and embrittlement in high stressed areas.
jds1969 (author)  pastorboy02 years ago
I would recommend you not do that with plastic casters and a rubber wheel. In that case you might want to switch to metal wheels/rollers. The aluminum may fatigue but it certainly stiffens to hold the curve better than it held it's form as a straight bar.
FYI the marine roller you used is actually a roller for a boat trailer.
HENCE MARINE (BOAT) ROLLER!!!!
There were a lot of "Marine rollers" on Market Street in San Diego in 1968!
jds1969 (author)  Bosun Rick2 years ago
Catching up on their "paperwork"?
jds1969 (author)  NitroRustlerDriver2 years ago
Thanks for letting me know. Makes sense.
Hm...something to do with this steering wheel of a 1965 Chrysler I have laying around?
Can you run a piece through several times and decrease the radius each time (sharpen the bend?)
jds1969 (author)  stringstretcher2 years ago
Absolutely. I ran the first piece through at least 15 times slowly adjusting the curve. With the Aluminum bar it was pretty easy to correct if you over do it.
gkern2 years ago
A very nice solution to bending metal without breaking the bank. Just wondering if you can bend Round rod, or piping with your setup.
jds1969 (author)  gkern2 years ago
In further reply to your question, for pipe I would do something that I was considering anyway. I would add side-plates with openings designed to keep the material in the center of the rollers. I would likely cut them out of plywood.
jds1969 (author)  gkern2 years ago
I would call this a medium-duty tool. I'm not sure where steel would fail to bend or create so much pressure to break something. There are always ways to strengthen the design but eventually you're almost better off buying the real thing. Good luck.
markplease2 years ago
Where did the little steering wheel come from?
jds1969 (author)  markplease2 years ago
I think it was from a dishwasher, washing machine or dryer that I pulled apart after it failed. I was happy to have it. :-)
bfk2 years ago
Great use of odds and ends. Super idea.
Great job, and well presented.
awesome!
Trick idea, very cool!
profpat2 years ago
cool design!
hjjusa2 years ago
I saw a fret roller, for bending guitar frets built on this principle, I couldn't afford it cause it was too expensive, so I made one out of three toy truck tires. I never thought of scaling it up like this though, excellent idea, I need some iron tires for a project I'm building
Dr Qui2 years ago
Thank you, you have just solved how I can roll a copper pipe into a tension ring for a Banjo Uke I have been collecting bits for. I can adapt your design to suit my job needs.
rimar20002 years ago
Nice design and neat work! That is a very useful tool.