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| John-Som:
Joe That's a very kind offer but the shape is not really what I'm after. Sorry to look the gift horse in the mouth ! John I am beginning to wonder if I was anticipating a problem that didn't exist. I will give it a go as you suggest and report back with the result. John |
| DMIOM:
--- Quote from: John-Som on May 24, 2011, 12:46:35 PM --- .......I do have a pipe bending tool which works fine on the copper tubing that we use on our steam engines but I am looking to shape 1/4" thin wall steel tubing which I feel will need internal support. Suggestions anyone ? John-Som --- End quote --- John, Have a look at this bender thread by George Britnell, which, in to making the tool, also has some info on bending possibly similar material. Dave |
| 75Plus:
--- Quote from: John-Som on May 25, 2011, 05:21:19 PM ---Joe That's a very kind offer but the shape is not really what I'm after. Sorry to look the gift horse in the mouth ! John --- End quote --- Would you care to share the shape you have in mind? Someone here is sure to have the solution. Joe |
| Jasonb:
I think this is the type of drill bit Bogs was suggesting :D Pity they don't go small enough |
| DMIOM:
John-Som - you could also cap one end, fill the tube with fine sand and then seal the top end before bending (either threaded or a plug of solder) Alternatively (OT) --- Quote from: Jasonb on May 26, 2011, 02:39:14 AM ---I think this is the type of drill bit Bogs was suggesting :D Pity they don't go small enough --- End quote --- nahhhhh - too simple and not enough :proj: the answer is, in true MM style, a fusion of the earlier answers. What you want to do is, as per Bogs, bend the solid rod stock into shape, using stainless for your material. Dave Bluechip mentioned Bowden cables, but rather than using it as a bending spring, afix the requisite short stub drill bit to the end of the core of the Bowden cable, ensuring the lay (twist) of the cable is the same handed lay as direction of rotation of the bit. Then (and I'm sure Kenneth could help here) get something like the scan coils from the neck of an old cathode ray tube (TV tube) and drive them from a CNC rig, and because the stainless is relatively transparent to magnetism, if you apply enough power to the coils you should be able to steer the steel drill bit through the workpiece (NB don't try this at home if you've got a pacemaker!) Dave |
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