Re: [ATM] bending square aluminium tube

["matt" <mariusrf@bellsouth.net>]

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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