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[bigegg]

I'm in the process of building myself a "ring roller"   

and find myself in need of three identical parts (the rollers) to complete the design:-

They are basically a solid cylinder of steel, about 75mm long and about 50-100mm in diameter.
The cylinders will either need to be bored to receive an axle (of about 25mm diameter)
or have an axle already formed.

something like this:


does anyone know of anything which uses parts like this, where the parts are readily available?
I only want three to start with - but a ready supply would be nice.
I *could* have them bespoke made on a lathe, but I'd prefer something "off the shelf".
Any ideas or help appreciated - thanks!


The machine I'll be building is for bending curves in square steel tubing - and will have to take a fair amount of force - I'll be using a 5tonne hydraulic jack to
provide the bending force.

[feeutfo]

How will it work with varying sizes/radiouses of bend..? Bump it round in a series of small bends..? Or roll it round on a constant radious?  the later, or possibly both, needing a die to match the size I would think?

[feeutfo]

Front roller on one of these any good?
http://www.eliseparts.com/products/show/37/258/lightweight-trolley-jack/

[bigegg]

Front roller on one of these any good?
http://www.eliseparts.com/products/show/37/258/lightweight-trolley-jack/

that might just do.
email sent.   

as to how it works - you have a triangle of rollers, and the bar is fed under the top roller,
and over the bottom two.
the top roller moves up and down to vary radius,
and the two bottom rollers are driven.
the bar moves backwards and forwards through the rollers, adjusting the top roller
until the correct radius is obtained.
It's used for making the curved tops of gates, but I'm building a skateboard quarterpipe.

[Kevin Wood]

We have pretty substantial steel rollers in the cable guides on the front of our gliding winches.

The company who make them has a parts store:

http://www.skylaunchuk.com/Prodskylaunch23.php?cat=25&pg=2

Might be worth giving them a call.

They are tubular rollers with bearings pressed into each end. Not sure how you'd drive them, but they would probably work as the idling roller.