RE: Copper tubing bending

Subject:  RE: Copper tubing bending
  Date:   Thu, 24 Apr 97 05:52:49 UT
  From:   "William Noble" <William_B_Noble-at-msn-dot-com>
    To:   "Tesla List" <tesla-at-pupman-dot-com>

liquid won't work because it will just move out of the way - the sand is
hard to move and incompressible that's why it works at all.  but a
bender is a better way, and annealing the tubing before bending is
helpful too

[Bill]  snip 
btw: instead of filling the tube with sand - how about a LIQUID? First
you weld the other end shut (the inner end in final coil - if spiral)
then connect a cheap valve to the other end. Now, you fill the tube with
water and close the valve.. Should work fine. 

  Kristian Ukkonen.