lathe trouble

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Viewing 15 posts - 16 through 30 (of 39 total)
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  • #24183
    shadoh
    Participant

    Great link, that one goes into my folder for sure. I will check out the others later when I have time.

    Thanks for the info.

    #24184
    martin777
    Participant

    😯 You WOULD NOT BELIEVE how well this mod. improves a mini-lathe!!! 😯

    http://www.mini-lathe.com/Lapping/mt_lap.htm

    p.s.– 💡 We need a topic dedicated to lathes/machining!
    Anthony266/Adam in SoCal?–hint-hint

    #24185
    shadoh
    Participant
    quote :

    p.s.– Idea We need a topic dedicated to lathes/machining!

    I couldnt agree more.

    #24187
    cygnus-x-d82
    Participant

    thanks for the links….there is a bit of chatter…but my cutting die usually fixes this….

    the problem is that the tool is not hitting the same place, couple of cuts and it cutting a groove as supposed to…and then suddenly decides to cut the top of the thread, basicly ruining the whole thing

    i have tried that cutting at an angle….i messed up and gave up after a couple of try’s

    i think i had mine at a 29 degree angle ….but from the wrong angle…i will try that again tomorrow see if helps with the chatter….cant get much worse….

    using the numbers…as long as you use the same everytime your fine no matter what….but some threads alow you to just pick one instead of waitng for a particular one to come around…

    got the frame threads done on 2 pieces and on one practice piece….then the tip broke off the tool as i got too eager….and the carbide tools i bought where very cheap…its not the first time it happens…luckily i was done and i allready got some bits that i made my self…so im ready for some machining tomorrrow….

    the treads going in to the bottle actually came out pretty good i think…after a quick grind with a thread file…they look good…and they screw into the bottle real nice…no wiggle…no slack…just smooth

    #24188
    y
    Participant

    I third that !!!….

    Give me somewhere to post my shop pics…

    #24190
    martin777
    Participant

    You need to cut a clearance area where the threads end. The smaller dia. (< or = minor thread dia.)
    will provide a relief allowing the tool to gracefully “emerge” at the end of each pass!

    Enough relief area will give you room/time to stop the motor and will leave a very nice transition.
    💡 You might also cut a 30 Deg. bevel at the end BEFORE u start threading–will make it easier to screw in after your done.

    Hang in there— 8)

    #24198
    martin777
    Participant
    quote martin777:

    p.s.– We need a topic dedicated to lathes/machining!
    Anthony266/Adam in SoCal?–hint-hint
    quote Shadoh:

    I couldnt agree more.
    quote Yellow Ninja:

    I third that !!!….

    Holy New Topic–Batman!!!
    http://talonairgun.com/forum/viewforum.php?f=11

    First Class–Good Show!!!
    :mrgreen:

    #24202
    shadoh
    Participant

    Well, its just a name change to one thats already there )

    #24206
    mcmike
    Participant

    Hello,

    I know it’s nice to be able to turn threads but why aren’t you guys not using the tool that is meant to cut threads? (Don’t know the proper english name).
    I mean if you are doing lots of valves and need same threads all the time it would be so much easier and you could never make it wrong.

    I mean this kind of tool:

    #24207
    shadoh
    Participant

    For me, the large tap and dies are rather expensive. If I can cut them for free on my lathe I go that route.

    #24208
    y
    Participant
    quote mcMike:

    Hello,

    I know it’s nice to be able to turn threads but why aren’t you guys not using the tool that is meant to cut threads? (Don’t know the proper english name).
    I mean if you are doing lots of valves and need same threads all the time it would be so much easier and you could never make it wrong.

    I mean this kind of tool:

    Thats a DIE, the one that cuts a female thread is the TAP.

    I use them for small threads, but like Shadoh said, the large sizes are rather expensive to get one nevermind a whole set. Different materials require difference tolerances when cutting threads so the general purpose dies have a lot of leeway in them which means they wont be as good as a machine cut one that can be custom tailored to specific tolerances.

    #24216
    mcmike
    Participant
    quote Yellow Ninja:

    Thats a DIE, the one that cuts a female thread is the TAP.

    I use them for small threads, but like Shadoh said, the large sizes are rather expensive to get one nevermind a whole set. Different materials require difference tolerances when cutting threads so the general purpose dies have a lot of leeway in them which means they wont be as good as a machine cut one that can be custom tailored to specific tolerances.

    Oh yes. DIE it was. Thanks.
    And that explains. Price and accuracy. I agree. If you are looking perfect precision then you need to turn it. But boy do I hate turning threads manually. One simple slip and you have scrap part or damaged lathe in worst case. Or dent on the forehead…. which actually reminds me why I hate turning threads… 😕

    I need to start re-improving my turning skills since there seems to be so many nice mods you can do for Talon (most which require turning and threads). I have access to a nice semi-CNC lathe. You can just enter the thread specs there and press button – it will turn the thread for you. No need to worry about damage or hitting anything. Need some practice to operate that though.

    #24249
    blodnob
    Participant

    Hey Cyg’
    Does your lathe have a reverse ? I dont take my lathe out of gear once ive done the first pass. I put a clock on the toolpost go in 5 , do a pass, stop machine, then retract the toolpost to 5 past zero and reverse. Then start again +5 from the last pass.
    I have a few spare 14tpi full form tips if you would like one.


    For the bottle threads i just use a split die in my tail stock doodaa.


    #24252
    walkonking
    Participant

    Big B,

    Thank for those picts. I really need to get back in the shop and fix my lathe. Your post are making me want to make things.

    #24253
    martin777
    Participant
    quote blodnob:

    14tpi full form tips

    Where did you get those tips? 😯 Have a link?

    ❓ Is that a chunk of hex bar stock your threading?

    That’s cheating! 😛

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