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| Boring head Ball/Radius turner |
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| Arbalist:
--- Quote from: John Stevenson on April 28, 2014, 08:27:22 AM ---It's always amazed me that so many of the Bedair type have been made given the pain of setting them up. --- End quote --- I made my Bedair style ball turner from stock I had to hand including the bearing. I don't have a boring head but can see the advantage of this type. I may well make one if I buy a boring head. I think more folks would make this type if their were more build logs of them available. I should add that I have a four way tool post but don't see that as a problem. Do you have to use bearing races or could you use a plain bearing and what's the best way of limiting end float? Any links to plans/drawings or build logs? |
| velocette:
Hi A boring head for ball turning I find one of the most satisfying tools to use in the workshop lots of feel a real hands on tool. Personal preference for cutting tool is a round nosed HSS tool with 4 - 5 deg top rake, 6 - 7 deg front rake and used upside down of course. ""Do you have to use bearing races or could you use a plain bearing and what's the best way of limiting end float? Any links to plans/drawings or build logs?"" To reply to "Arbalist" A plain Bronze bearing with a close fit .001" per Inch diameter is a guide use a thrust washer on the front and rear face, keep lubricated with light oil. The force from cutting will take up all clearance - - end float. Eric |
| redshift:
Can someone pleases explain to me the geometry of the cutter. For the life of me I cant see how this can work, it obviously does, It just seems all wrong with the cutter operating vertically as the cutting edge would be 90 degrees out. Regards Dave |
| RodW:
--- Quote from: redshift on April 29, 2014, 05:32:41 PM ---Can someone pleases explain to me the geometry of the cutter. For the life of me I cant see how this can work, it obviously does, It just seems all wrong with the cutter operating vertically as the cutting edge would be 90 degrees out. Regards Dave --- End quote --- Dave, I put the tool in the opposite way to what you would use for boring. On one cut it is using the back of the tool but it works. Some people have made up a custom tool with a better profiled insert tip for the job in hand. I might do that one day. I thought about using bushes but the bearings were cheap at only $10 the pair and easy to source. |
| Chuck in E. TN:
Rod, I have also used my boring head for turning tapers. I turned ball ends on some 1/2" drill rod, unhardened, mounted the stock between them, and set the taper with the boring head. Made a couple of MT2 tapers to test. Works great. Chuck |
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