Re: [ATM] ATM Digest, Vol 39, Issue 25

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

Hi Arjan,

It was already very difficult (very much force to be used) to bend the 20 mm 
diameter, 1.5 mm wallthickness square tubing into a ring without damaging it 
too much. That's why I didn't try to bend the 30 mm diameter, 2 mm 
wallthickness tubing, but made the dodecagon. This is very easy, because 
most mitres can be set easily to cut the twelve parts.

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

----- Original Message ----- 
From: "Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>
To: <atm@atmlist.net>
Sent: Sunday, March 25, 2007 9:17 AM
Subject: Re: [ATM] ATM Digest, Vol 39, Issue 25


> Hi Jan,
>
> Any specific reason to go from circle to dodecagon?
>
>   Arjan
>
>> I made a new secondary ring again. Well, not a ring but a 12-angle
> polygone.
>> At closer inspection, the former one didn't keep collimation well enough,
>> because of flexture of the 20 mm diameter aluminium ring. I made one of 
>> 30
>> mm diameter tubing now. This one keeps its collimation well!! And all 
>> this
>> work made me an experienced wire spider builder.
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


_______________________________________________
ATM mailing list http://www.atmlist.net/