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micromark lathe not forming threads

Discussion in 'MINI-LATHE & MINI-MILL INFORMATION' started by Sk8ter, Jun 1, 2017.

  1. Sk8ter

    Sk8ter United States Active User Active Member

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    Hey guys I have not cut threads on the mini i mostly used dies, so when i began to cut some threads simple 1/4 dia 20, the threads do not form it looks like it starts to form and then another pass and its wiped out! I thought I possibly had a metric thread dial or a metric lead screw but b0th are 16TPI

    scratching my head hear

    give me a hand will ya

    Thank you

    Lawrence
     
  2. Sk8ter

    Sk8ter United States Active User Active Member

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    Ok playing around leaving the half nuts engaged it is forming a thread but NOT the thread i picked with the change gears, I picked 20TPI and its cutting like 25TPI, very weird I am at a loss my lead screw is 16tpi and the threading chart shows A 40T B&C can be any gears and D 50T
     
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  3. higgite

    higgite General Manger - Proofreading Dept. Active Member

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    Are the change gears set up like Fig. A or Fig. B on page 10 of the manual? For 20 TPI, they should be set up like Fig. A with A-B-D gears in a straight line.
    I'm looking at the Micromark Microlux 7x16 manual on the web.

    Tom
     
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  4. Sk8ter

    Sk8ter United States Active User Active Member

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    Hi Tom, Yeah I finally figured it out you do not need C gear for 20TPI and yes ABD gears are now inline

    man I feel stupid, no wonder I have not threaded on the mini Pain in the ass.

    Thank you for responding :)

    Lawrence
     
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  5. higgite

    higgite General Manger - Proofreading Dept. Active Member

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    Glad you worked it out, Lawrence. I'm glad I didn't pull any rookie mistakes when I first got a mini lathe. That's my story and I'm sticking to it.

    Tom
     
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  6. Sk8ter

    Sk8ter United States Active User Active Member

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    Thats the funny thing not too new rookie LOL I have had other large lathes that i did my threading on but now only the mini is left to play with. IMO they need to change the chart as anyone can think like i did and follow the destruction's LOL.
     

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