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Thread: DDTI Thread

  1. #1
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    Default DDTI Thread

    I'm making an adaptor for a DDTI the thread sizes was supposed to be 2.5mm after much cursing and searching to find size variants seems there are a few. I discover these are NF #4-48. My problem now is locating a die to cut the new thread.

    20200904_104932.jpg20200912_133256.jpg20200912_154226.jpg20200912_154539.jpg

    In all material/books I have, no mention of #4-48 only place I found it was on my Suttons wall chart and on this plastic gauge son gave me.
    Attached Images Attached Images

  2. #2
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    Quote Originally Posted by wheelinround View Post
    I'm making an adaptor for a DDTI the thread sizes was supposed to be 2.5mm after much cursing and searching to find size variants seems there are a few. I discover these are NF #4-48. My problem now is locating a die to cut the new thread.

    20200904_104932.jpg20200912_133256.jpg20200912_154226.jpg20200912_154539.jpg

    In all material/books I have, no mention of #4-48 only place I found it was on my Suttons wall chart and on this plastic gauge son gave me.
    Standard UNF thread which should be available at any good tool supply store.

  3. #3
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    Hi Ray,

    Quote Originally Posted by wheelinround View Post
    I'm making an adaptor for a DDTI the thread sizes was supposed to be 2.5mm after much cursing and searching to find size variants seems there are a few. I discover these are NF #4-48. My problem now is locating a die to cut the new thread.

    20200904_104932.jpg20200912_133256.jpg20200912_154226.jpg20200912_154539.jpg

    In all material/books I have, no mention of #4-48 only place I found it was on my Suttons wall chart and on this plastic gauge son gave me.
    When I made the wheel follower for my DDTI, I cut the threads on the lathe ! I couldn't find a die anywhere.

    M2 and M2.5 dies are common !
    18-01-2019-009.JPG 18-01-2019-006.JPG Roller tip.jpg
    That last picture is one from the web of what it I made. It works very well !
    Best Regards:
    Baron J.

  4. #4
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    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  5. #5
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    Quote Originally Posted by OldRustyToolie View Post
    Standard UNF thread which should be available at any good tool supply store.
    Yet not one on my thread gauge and reading a few forums and watching a few videos of far more experienced machinist who also couldn't work out the thread size. If I had not had that gauge I wouldn't have either.

  6. #6
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    Quote Originally Posted by BaronJ View Post
    Hi Ray,



    When I made the wheel follower for my DDTI, I cut the threads on the lathe ! I couldn't find a die anywhere.

    M2 and M2.5 dies are common !
    18-01-2019-009.JPG 18-01-2019-006.JPG Roller tip.jpg
    That last picture is one from the web of what it I made. It works very well !
    BJ M2 & 2.5 no worries easily sourced.

  7. #7
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    Quote Originally Posted by steran50 View Post
    Thanks Steran I had looked at LPR & Ebay earlier but only came across as is on the LPR lik "Carbon Steel" I've made the part using stainless steel it might cut the thread but it may not
    I'll send them an email or phone tomorrow.

    Ray

  8. #8
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    Quote Originally Posted by wheelinround View Post
    ...I had looked at LPR & Ebay earlier but only came across as is on the LPR lik "Carbon Steel”
    they also have them in HSS: https://www.lprtoolmakers.com.au/mac...0-80-to-12-24/
    Chris

  9. #9
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    Hi Ray,

    Quote Originally Posted by wheelinround View Post
    Thanks Steran I had looked at LPR & Ebay earlier but only came across as is on the LPR lik "Carbon Steel" I've made the part using stainless steel it might cut the thread but it may not
    I'll send them an email or phone tomorrow.

    Ray
    You don't want to be using carbon steel on stainless with a thread that small.

    I used to do hundreds of 4BA threads on stainless steel rods ! The carbon steel dies simply had the teeth ripped off. I started to buy top quality Presto and Dormer HSS ones after discovering that the rods wouldn't thread into their holes because half the threads were missing. Surprisingly the Presto dies cut much better !
    Best Regards:
    Baron J.

  10. #10
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    Thank you all LPR might just be the go. Saying that if I can grind the tool to 60^ the ML7 gearing I have will set me up to give it a go in cutting it. I can only try.

  11. #11
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    After a few days Dr advised feet up R&R I got back into this project yesterday, frustrated with not findung the right size thread outlaying for tools (of course won't be a waste just add to collectionDDTI ThreadDDTI Thread).
    I spent an hour or so going through thread gauges while wearing a head mounted magnifier and finally found the DTI thread is 2.2mm x .45 DDTI ThreadDDTI ThreadDDTI Thread lesson learnt never rely on someone elses measurement DDTI Thread.

    Photos to come.20200927_151344.jpg20200927_151537.jpg20200927_151420.jpg
    Last edited by wheelinround; 27th Sep 2020 at 10:54 PM. Reason: Add photos

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