Problems bending 3/16″ dia copper pipe without kinking

[Speedy Builder5Participant @speedybuilder5]

To the above, bend the tube a few degrees more than you want, then bend it back to correct angle. This also help to release the cord inside.

[GreensandsParticipant @greensands]

I am in also two views as to whether annealing before bending is always a good idea and certainly with the more generous radii it is possible to achieve very good results bending by hand pressure alone using conviently available stub ends etc as mandrels.

[Martin ConnellyParticipant @martinconnelly55370]

This is some 1/4" 20swg 316L tube being bent with tooling I made out of CA104 bronze. The machine is an Addison DB89. The tooling consisted of a bend die, clamp die and follower die and were all half round forms fully supporting the outside of the tube. The bend was 3/4" (3D) centre line radius. No mandrel, no filler. Sorry about the quality and colours, it was some years ago and cameras have got better since then.

Martin C

Forgot I also made the collet blocks to grip the tube end.

Edited By Martin Connelly on 14/06/2020 11:07:14

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