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  1. #1
    Join Date
    Jun 2010
    Location
    yenda nsw
    Posts
    8

    Default sheraton conquest lathe

    i have had an ex army sheraton 600 conquest lathe since 1990,but only recently decided to cut threads with it.when the unit was purchased it was not confirmed that the gear set was complete.from reading the chart it appears most of the gearing is complete and i can cut most imperial and metric threads,however i am running into trouble trying to engage the lead screw with reference to the chasing dial when trying to cut 16 TPI.the only screw gears(dial gears) i have are 24 ,33 and 35 tooth which are mentioned on the metric chart.do i need other thread dial gears to chase imperial threads from the lead screw.any help would be greatly appreciated as i am pulling my hair out at the moment after trying every combination of dial gears i have only ended up cross cutting threads galore.cheers leopardwood

  2. #2
    Join Date
    Oct 2008
    Location
    Mid North Coast NSW
    Age
    45
    Posts
    177

    Default

    Is the leadscrew metric or imperial?

  3. #3
    Join Date
    Jun 2010
    Location
    yenda nsw
    Posts
    8

    Default

    hi ben the lead screw is 3 mm metric,the lathe according to the plate was delivered to the army in 1977.cheers jb

  4. #4
    Join Date
    Oct 2008
    Location
    Mid North Coast NSW
    Age
    45
    Posts
    177

    Default

    Ok there's your answer. You won't be able to cut imperial threads using the thread chasing dial. You need to lock the half-nut and then cut the thread by driving the lathe in forward, back the compound out then drive the lathe in reverse to get back to the start of the cut. Then repeat. You'll be able to cut metric threads using the dial though.

  5. #5
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Quote Originally Posted by BenM78 View Post
    You'll be able to cut metric threads using the dial though.
    But you will need extra gears for the thread cutting dial when cutting metric threads..

  6. #6
    Join Date
    Jun 2010
    Location
    yenda nsw
    Posts
    8

    Default

    thanks ben for your prompt reply.i have successfully cut imperial threads using the method you described.but i was getting the cutting tool into the chuck or the work far too often,i erroneously thought i could cut imperial threads from a metric lead screw from the dial simply by marking the dial.and engaging the half nuts on the scratch mark.thankyou very much for setting me straight.this lathe does not have a brake on it so i am finding it hard to arrest the progress off the cutting tool at the completion of the run.thaks again jb

  7. #7
    Join Date
    Aug 2008
    Location
    Adelaide
    Age
    68
    Posts
    1,373

    Default

    What revs are you running when screw cutting?

  8. #8
    Join Date
    Jun 2010
    Location
    yenda nsw
    Posts
    8

    Default

    60 rpm cheers jb

  9. #9
    Join Date
    Aug 2008
    Location
    Adelaide
    Age
    68
    Posts
    1,373

    Default

    Speeds are OK, are you cutting a "ditch" at the end of the threaded length?

  10. #10
    Join Date
    Oct 2008
    Location
    Mid North Coast NSW
    Age
    45
    Posts
    177

    Default

    If you use very sharp HSS and plenty of coolant, there is no reason why you can't turn the chuck over by hand and get a great finish and perfectly formed threads.

  11. #11
    Join Date
    Jun 2010
    Location
    yenda nsw
    Posts
    8

    Default

    thanks gavin and ben.i have just returned jubilant from the shop and successfully cut the afore mentioned thread.by the method suggested ie leaving half nuts engaged and forward/reverse feeds.i am sure my ealier failures were operator inexperience,i have now learned (painfully) to back of the cross feed simultaneuosly at shutdown to clear the work and also double check the forward reverse switch prior to start.yes i am cutting a trench at the end of the thread and thakyou for your interest and speedy replies.cheers jb

  12. #12
    Join Date
    Sep 2006
    Location
    Australind , WA
    Age
    58
    Posts
    1,277

    Default

    My Apprentice Trainer used to say
    "If your not making mistakes, you are not doing anything......"
    Well done on a successful thread cut.

    Sterob

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