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| Ball or Radius cutter |
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| MadNick:
Evening, This afternoon's progress. My neighbour came up trumps with a brass piano hinge of the ideal width for my shims - I fitted them to the sides of the toolpost by way of self tapping screws. I originally tried to use an M3 tap with some tiny countersunk crosshead screws but for some reason I just couldnt get the screws started after tapping out the holes - I believe my M3 tap to be just too worn. You have to work with what you have so I used the self tappers and ground them flush - A quick dressing with some emery paper and wayhey, the shims werent brass at all but brass-coloured. Too late to do anything about it now as those shims are going nowhere. The next job was to find the centreline on the toolpost - I milled out a shoulder and then drilled/tapped three M6 grub screws - Tomorrow is what I believe to be the tricky bit, milling out the recess for the tool. Got to get it right or the whole toolpost becomes scrap... Nick |
| Divided he ad:
Nice save Nick :thumbup: Just a note before you machine... Best to turn a point in the chuck first and re-check that line... I made my first one to the tail stock height as Steve Bedair said (IIRC) It was approx 0.20mm too low. Subsequently leaving a pip on all I machined! Worth the extra time to check. Fergus, I'm aware that much is in books.... Sadly I do not own many of the books out there. Some, but not many. Hence my questions. Fair comment on the smaller lighter machinery.... I'm a mere 37 and much of it is too damn heavy now! Ralph. |
| rleete:
Easiest way for me was to mount it in the lathe, and drill the hole with the chuck. Since I was using a 1/4" round bit, that ensures it is perfectly on center. |
| MadNick:
Thanks for the responses :) Last night I came to a simpler conclusion in mounting the cutting tool. Rather than bolting up the tip in the picture, I could use my 8x8 carbide toolholder, mounting it on the upright part by cutting a slot/drilling a hole and securing with a couple of grub screws. This would allow me to swap out tips and save a lot of aggravation/time in forming the toolpost. Hopefully will get a chance to do some more work on this later. Nick |
| ksor:
>> MadNick I think you have to protect your balls - the ones in the bearing of cause - I think small chips will find a way to obstruct a nice smooth turning. I did one much like yours - http://kelds.weebly.com/kuglevaeligrktoslashj.html - see the 6. 7. 8. picture the balls are hiden behind a skirt - just like a scotchman would do :D But try it out - if it's a problem - you can turn a ring on the lathe and solde it in place to protect the balls. You HAVE to use brass to protect against scratches - again look what I did - it was a bit tricky to mill it but it can be done. You can make Google to translate my website ! |
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