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  1. #1
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Default 1:20 Tapered reamer

    Hi all,
    Now i have my 2 taper pins made for tramming the Verniers head, one thing is clear. The head is not precisely trammed with the pins in! I have to pull the head off again and check there is not a tiny chip anywhere inbetween the mating surfaces, but i doubt it.
    The pins are a 1:20 taper, and so far the only reamers i can find are for timber, they use 1:20 for stringed musical instrument tuning pegs....
    The other option is to make a reamer from some silver steel, once hardened it should manage the 2 holes.

    Has anyone seen or heard of a 1:20 reamer, or has any wisdom on making one i would be grateful.

    Cheers,
    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  2. #2
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    Default

    Do you have access to a grinder that can do tapers, if so what about using a drill bit ground to the taper required. To grind a tapered reamer from blank steel could be more work than necessary.
    Either that or grind a spare reamer, you'll probably use it again somewhere!
    Regards
    Kryn

  3. #3
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    Default

    FWIW the taper on centreline of standard imperial taper pins is 1:24 and for metric taper pins it is 1:25

  4. #4
    Join Date
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    Default

    Jarno Taper is 1:20

    some examples here.

    Helical Jarno Taper Reamers

    -Josh

  5. #5
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    Default

    Hi Ueee,
    I have quite a number of Tapered Reamers and several No2's, send me your address and I will post one to you as I dont need them all.
    Regards,
    Keith_W.

  6. #6
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Default

    Thanks for the replies guys,
    Its good to know the Jarno is 20:1 Josh, makes it a bit easier.
    Bob, just to make it clear its 20:1 total taper, much steeper than the standard taper metric or imp.
    Nothing more than bench and angle grinders here Kryn, but i like the drill bit idea.

    Keith, that is a fantastic offer, once again a big to the spirit of the forum! I think in need a #3 but i'll PM you about it.

    Looking at the price of the Jarno reamers i might try making a D style reamer first.......

    Cheers,
    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  7. #7
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    Default taper andle

    would a 3 deg tapered drill work?

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