Re: [ATM] bending square aluminium tube

["Jan van Gastel" <jhm.vangastel@wanadoo.nl>]

The tubes are empty when they are bent.

Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/


----- Original Message ----- 
From: "matt" <mariusrf@bellsouth.net>
To: "Jan van Gastel" <jhm.vangastel@wanadoo.nl>; <atm@atmlist.net>
Sent: Thursday, January 06, 2005 8:52 AM
Subject: Re: [ATM] bending square aluminium tube


> Was the Aluminum tube empty when you bent it ? I don't know anything about
> bending tubes but I seem to have a fuzzy recollection from a previous life
> that for some type of tube, filling it with sand , or even with wet sand
was
> recommended procedure to avoid flattening the tube .
>
> thanks,
> Matt Tudor
>
> -----Original Message-----
> From: Jan van Gastel <jhm.vangastel@wanadoo.nl>
> To: atm@atmlist.net <atm@atmlist.net>
> Date: Thursday, January 06, 2005 2:50 AM
> Subject: Re: [ATM] bending square aluminium tube
>
>
> >I think the advantages of working with a wooden jig in a vice, is :
> >1. That such a jig is very easy to make and
> >2. It is easy to make a ring of a certain diameter, because the diameter
> >ring is determined by the radius of the jig. I made three rings of around
> >326 mm diameter with my 145/160 (convex/concave) jig and the difference
in
> >diameter is not more then about 1 millimeter. With a bit more experience
> >(these were my first three rings) this will be less.
> >
> >Advantage of the rollertool is, that you can make rings of different
> >diameters using the same tool, while new wooden jig must be made for
every
> >diameter. But because of point 1 above, that's no big deal.
> >
> >Jan
> >http://home.wanadoo.nl/jhm.vangastel/Astronomy/
> >
> >
> >----- Original Message -----
> >From: "Bob May" <bobmay@nethere.com>
> >To: <atm@atmlist.net>
> >Sent: Thursday, January 06, 2005 2:19 AM
> >Subject: Re: [ATM] bending square aluminium tube
> >
> >
> >> You really need to make the rollers from metal rather than wood.  Wood
> >will
> >> work but you need to do some good precision work as the three wheel
> method
> >> needs to hold the positions of the three wheels precisely.  Any slop or
> >> flexibility will make the end product kinky as the forces aren't
> >consistent.
> >> Also, for small diameter bends, you need to do the work in stages til
you
> >> get where you need it.
> >> Bob May
> >> bobmay@nethere.com
> >> http://nav.to/bobmay
> >> http://bobmay.astronomy.net
> >>
> >> _______________________________________________
> >> ATM mailing list http://www.atmlist.net/
> >
> >_______________________________________________
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>

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