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  • An answer ...

    From Snag@21:1/5 to All on Tue Apr 22 15:41:34 2025
    And now I know that the leadscrew is indeed Acme . I mentioned in
    the other thread about making a mold of the threads using a lead ball
    and a c-clamp. Well there ain't enough room under there for a clamp ,
    but there is room for a pair of vise grips . And now I have a perfect impression of an unworn section of the threads . You can't tell from
    looking at the screw what the profile is . But after forming the lead
    then cutting it with a utility knife blade to see the cross section it's definitely acme . I shall be setting up a fixture* to hold a cutter at precisely 14.5° on the mill and grinding the profile with my grinding
    disc I bought for the end mill sharpening fixture . I'll need to hold
    the small screwless vise in the mill vise to get a relief angle on the
    cutters . I'll be recutting another piece of stock - with the proper
    angle and dimensions - as a fit check .
    Clare Snyder and Joe Gwinn were both instrumental in my decision to
    make the lead impression ... Thanks Guys !
    * I'll need to grind both a 3/16" cutter for the boring bar and a
    1/4" for the OD thread . This project needs more precision than I can
    manage freehand . And I'll probably end up making one for the Y axis too .
    --
    Snag
    We live in a time where intelligent people
    are being silenced so that
    stupid people won't be offended.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Snag@21:1/5 to Jim Wilkins on Tue Apr 22 17:34:22 2025
    On 4/22/2025 4:57 PM, Jim Wilkins wrote:
    "Snag"  wrote in message news:vu8utu$1cks5$1@dont-email.me...

    ...This project needs more precision than I can manage freehand . And
    I'll probably end up making one for the Y axis too .
    Snag

    Before Tools4Cheap closed I bought a Univise clone from him to surface
    grind precise angles on lathe bits etc. Its base could be a good mount
    for a square 5C collet and tilting collet holder, such as the indexable
    one from an endmill sharpener or a spin index.

    https://www.penntoolco.com/precise-uni-vise-grinding-fixture-202-2615/?


    Dammit , I have more tools than I have room for now ! 'Sides , I've
    already got it figgered out what to use and how to hold it . Actually ,
    if I design the fixture right I won't need to use the screwless vise . Eliminates one possibility to screw it up .
    --
    Snag
    We live in a time where intelligent people
    are being silenced so that
    stupid people won't be offended.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)