Screw cutting on a CNC Lathe using G76 code

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How to setup screw threading operations using a G76 code on a CNC lathe.
In this video tutorial provided by G-Code Tutor, Marc Cronin dives into the G76 screw thread cutting cycle and explains what each part of the code does.
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29 июл 2019

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Комментарии : 21

@matejp.7947 4 года назад

Hello, I noticed you have the P value in the second line wrong, is P900 in that case not P600... (Diameter - core dia)/2. In that case (20-18.2)/2=0.9 so that give us P900

@weaponstester8976 4 года назад

Thanks you helped me find out what was wrong with the first cnc metric thread video

@root123 Год назад

Fantastic video

@bennygonzales4642 3 года назад

Doesn't core diameter and thread height conflict with each other ?

@robertshapiro5800 3 года назад

R value in the 2-nd stroke has to be a tapered (x-offset of start thread) parameter. If it is straight thread just R0 ... Very useful option which I think, has to be in your beautiful explanation.

@GO2camSA Год назад

explanation are very concise. thank you

@YountsMachine 11 месяцев назад

I have a thread to make and it have a groove where the thread stops kinda like an undercut but its where the z stops before the x moves to clear. is there a way to do that with a g76.

@TruthbetoldtotheWorld 2 года назад

So interesting and clear but P value should be big diameter minus final or smallest diameter divide by 2. Which gives 900 in this case instead of 600. Proof: 0.9*2+18.2=20 big diameter.

@joshmoore526 Год назад

Is the first R for finish allowance valued in microns as well?

@1kedoverheels 3 года назад

I think that "P" value is an upside-down 9 and not a 6?

@jsihavealotofplaylists 2 года назад

my old machine doesnt have p value. thank you for the tutorial though. when i get something more modern I'll be bacl

@basavarajjobs5323 5 дней назад

Tq you

@MechInvent Год назад

After memorizing this video meticulously... My lathe is too old for the g76 code

@sonzai9441 Год назад

Did you try the single line one?

@MechInvent Год назад

@@sonzai9441 no, is that a thing ? I checked and my lathe has g76 listed in the OS so maybe that's it

@sonzai9441 Год назад

@@MechInvent yes, just used it today on a 80- ies mori seiki

@kiurtosh 4 года назад

Or you can use after g76 a modal g92 for finish

@nathandalton2855 Год назад

wrong,,,, p value on second line should 0920 as depth of 1.5 thread is .920 multiply this by 2 (1.84) subtract that from thread major dia (20) gives 18.16 which should be your X core dia, this is easy to find in any thread spec, or just multiply the pitch by .6134 to give you your depth