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  1. #16
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    583

    Default

    What Michael says - 18 DP, so not Drummond. If your Myford is pre-metric and has loose change gears they will be 20 DP. Might be interesting to check some of them to see how close they are to the theoretically correct diameter to produce exactly 20 DP.

    Frank

  2. #17
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,205

    Default

    Hi Guys,

    I thought that I would post some pictures of the bits that had been in the citric acid bath.

    01-01-2020-001.JPG 01-01-2020-002.JPG
    First up the M&W callipers. I'm very happy with the way these came out ! They had two days, maybe 60 hours in a cold citric acid bath. I say cold because the workshop was only about 50F the whole time.
    01-01-2020-003.jpg 01-01-2020-004.jpg
    This 3 inch Bahco adjustable spanner cleaned up well too ! It was sized solid, so its been stripped and cleaned then lubricated. Just a pity about the pitting.
    01-01-2020-010.jpg 01-01-2020-009.jpg 01-01-2020-005.jpg 01-01-2020-006.jpg
    The scale came up quite well, its a good quality one as well. The callipers are a German brand, unfortunately the jaws have taken on some wear near the tips, but quite accurate between the body of the blades. The inside jaws don't seem to have had any use at all.
    01-01-2020-012.jpg 01-01-2020-011.JPG
    Last but not least is this item. Its been very well used. Non of the edges are sharp. All the teeth are worn as are the first 20 mm of the flutes. There are no visible markings on it to indicate what it is. Its 1/2" in diameter and 3" inches long. There is a hole in each end, but its not a centre as such since its flat bottomed.

    Does anybody recognise this tool ?

    Thanks Guys.
    Best Regards:
    Baron J.

  3. #18
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,205

    Question Mystery Tool bit.

    Hi Guys,

    I'm surprised that no one has commented about this item.
    More Christmas Goodies !-01-01-2020-012-jpg
    More Christmas Goodies !-01-01-2020-011-jpg
    Its been very well used. Non of the edges are sharp any more. All the teeth are worn as are the first 20 mm of the flutes. There are no visible markings on it to indicate what it is.

    Its 1/2" in diameter and 3" inches long. There is a flat bottomed hole in each end.

    Does anybody recognise this tool ?

    Thanks Guys.
    Best Regards:
    Baron J.

  4. #19
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,205

    Default

    Hi Guys,

    I've just discovered a bit more about this tool !

    I decided to try and clean out the muck that was in the hole in the top and saw a hexagonal hole below. I couldn't figure out why there should be a hex hole there, so I stuffed an Allen key into it and discovered that there was a 10-24 UNC grub screw in there. I measured the threads on the grub screw, which was how I discovered that it was a 10-24 thread in the hole. It extends to about an inch deep.
    Best Regards:
    Baron J.

  5. #20
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    64
    Posts
    1,755

    Default

    If not mistaken bore for rock drill think explosive holes

  6. #21
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,205

    Default

    Hi Ray,

    Thanks for your post ! I think 1/2" diameter is probably a bit small for a blasting hole.

    All the explosives that I've had my hands on have been sticks of gelignite about 1.5" inches in diameter and 8" inches long wrapped in waxed paper. You don't want to get the stuff on your skin either !

    I'm guessing that the threaded hole is so that an extension rod can be screwed in to get extra length. I did wonder if it could be a counter bore of some kind.
    Best Regards:
    Baron J.

  7. #22
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
    Age
    63
    Posts
    211

    Default

    Quote Originally Posted by wheelinround View Post
    If not mistaken bore for rock drill think explosive holes
    I thought the same then remembered the head is flared at the end for rock drilling. The hole it makes is larger than the shaft so the air going down the centre of the drill bit can blow the material back passed the shaft and out of the hole.

    Tony

  8. #23
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    64
    Posts
    1,755

    Default

    Could always have been modified?

    More Christmas Goodies ! old spline shaft

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