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Thread: Mini lathe internal dome tool

  1. #1
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    Stevohdee's Tools

    Mini lathe internal dome tool

    Gday fellow tool fans, here's my latest gadget born from necessity. A somewhat challenging build with a few unique tips, I hope you enjoy the build,
    All the best, stevoh

    Mini lathe internal dome tool-img_20210602_165445_copy_912x436.jpg


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  2. The Following 12 Users Say Thank You to Stevohdee For This Useful Post:

    asterix (Jun 4, 2021), baja (Jun 12, 2021), bruce.desertrat (Jun 4, 2021), Home-PC (Jun 7, 2021), homey_g (Jun 6, 2021), johncg (Jun 4, 2021), Jon (Jun 3, 2021), old_toolmaker (Jun 4, 2021), Skun Knuckles (Jun 4, 2021), sossol (Jun 4, 2021), tonyfoale (Jun 5, 2021), Toolmaker51 (Jun 3, 2021)

  3. #2
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    Thanks Stevohdee! We've added your Internal Dome Tool to our Lathe Accessories category,
    as well as to your builder page: Stevohdee's Homemade Tools. Your receipt:




  4. #3
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    I don't watch a lot of tool builds. This one caught me, you circumvented the common solution; a yoke. I like it.
    Extending the hinge pin, allows a reference to set accurate radii, via height gauge. Another method would leave holder in place, referencing with a known size block against a surface, zero a dial and back up, then set protrusion of cutter.
    A hint on lapping. Cutting action improves by alternating straight strokes, rotating the part 15°-45°, produces a crosshatch [aka 'lay'] before final desired finish. Another technique is tracing figure 8's.

    Yoke in this case provides movement to swing cutter, essentially a hinge.
    https://www.google.com/search?q=hold...l87LWMCxqNU18M

    A hemisphere is produced by the tool tip distance [radius] from hinge centerline. Extended, it forms a concave. Retracted, generates convex.
    Last edited by Toolmaker51; Jun 4, 2021 at 05:35 AM. Reason: added to define yoke
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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    Quote Originally Posted by Toolmaker51 View Post
    I don't watch a lot of tool builds. This one caught me, you circumvented the common solution; a yoke. I like it.
    Extending the hinge pin, allows a reference to set accurate radii, via height gauge. Another method would leave holder in place, referencing with a known size block against a surface, zero a dial and back up, then set protrusion of cutter.
    A hint on lapping. Cutting action improves by alternating straight strokes, rotating the part 15°-45°, produces a crosshatch [aka 'lay'] before final desired finish. Another technique is tracing figure 8's.
    Thanks for your advice, I had to Google yoke but came up with a thing to align two bullocks but a bit more digging found some pertaining to machining, still confused. I'd have to see one in action to fully understand how one would make an internal dome. Was thinking of center punching a dot in the middle of the hinge pin then using a divider or compass to set radius. Will try your tips on finishing on the next build, thanks, regards steve

    Hang on, found it... A ball/radius turning attachment has a yoke, so it can be set up to do inside radius, got it, thanks again
    Last edited by Stevohdee; Jun 4, 2021 at 05:34 AM.

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    old_toolmaker (Jun 4, 2021), Toolmaker51 (Jun 4, 2021)

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    Some Tool for Minilathe

    That was an interesting video!
    Great work!
    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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    Stevohdee's Tools
    Thanks for the link, I've seen plenty of ball turners but never realized they could be used in reverse, otherwise I would have made one... Only prob would be chatter by extreme overhang with large radii I guess, your info much appreciated, cheers

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    Thanks Dick, always a pleasure to get accolade from someone with your talent, regards steve

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    old_toolmaker (Jun 4, 2021)

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    The assorted commercial & DIY ball turning apparatus are proportioned to lathe swing; the largest have substantial form tools to dampen vibration. Few get used in roughing out radii, chatter can be reduced in ways to include wrapping with rubber or lead, tapered holder/ cutter, rpm, feedrate and tool form.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  12. #9
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    Good job,I have never seen a die holder like that is it something else you’ve made?

  13. #10
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    Quote Originally Posted by Skun Knuckles View Post
    Good job,I have never seen a die holder like that is it something else you’ve made?
    Thanks skun knuckles, love the name, haha, yep made die holder, it simply slides over the tailstock quill, cheers

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