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Thread: Brass turning

  1. #1
    Join Date
    Dec 2005
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    South Australia
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    Default Brass turning

    Ok as I have mentioned before my metal lathe skills are basically try this and if it worked well done pat on back, so advice please, planning g to chuck a a piece of brass appr, 64mm diam
    and to put it simply make a couple of rings 4.8 thick, is there any reason why I should not just use a parting off tool on the face and also on the side is, or is there some lathe turning taboo to prevent that
    if it was my wood lathe that is what I wood do

  2. #2
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    Norwood-ish, Adelaide
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    Default

    The main reason that I would not use a parting tool for that sort of thing is that being a thin blade it flexes, so you won't get the geometric accuracy that you probably want. While some parting blades exist that are designed for cuts other than just plunging in, most are not.

    Michael

  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    Default

    Hi China,

    You don't say what diameter ring only the thickness.

    Do you just want to salvage the material in the middle ?
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Nov 2018
    Location
    Tasmania
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    Default

    You want a trepanning tool
    It is similar to a parting tool but has clearance for the axial plunge

    The alternative is to use a hole saw or annular cutter to save most of the material and bore it to final size from there

  5. #5
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    This is similar what I wish to end up with, to circles both with a recess on one side I am an quite happy to grind the correct cutters
    the specs are. from 64 mm blank, decoration around the edge is not required

    Od 61 mm
    Id 50 mm
    Thickness 3.8/4 mm
    Recess 2 mm
    Box Hinge.jpg

  6. #6
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    Dec 2005
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    South Australia
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    Thanks trepanning tool yep that is what I need, I had a look at Oxtoolco explains it every well, I will post the hopefully
    successful results

  7. #7
    Join Date
    May 2009
    Location
    Sydney
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    75

    Default

    As has been said, for the groove on the front of each ring you will need to grind a trepanning tool with a radius. Watch https://www.youtube.com/watch?v=6PcEBaset1I for some ideas, though your tool will have a radius on the front.

    Once you have a good trepanning tool (practise getting the face you want), then you have a couple of options:

    1. Turn a bit of the stock to the OD, then drill and bore the centre. Trepan the radius into the face, chamfer the front, start the parting, stop and chamfer the parting cut, then finish the parting and manually chamfer the inner edges. Repeat for the 2nd ring.
    2. Do as above but use the method shown in the video to avoid wasting the core. Probably not much of an issue for two thin rings like those you want in brass. I'd use method 1.

    A couple of notes.

    1. You want minimal/no back rake for a brass tool.
    2. Practise your trepanning and parting. You won;t get it right the first 10 times. Folks here will help with any specific difficulties. Pictures and videos make it so much easier to be helpful.

    Phil.

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