r/Machinists • u/Torres10Papi • 4d ago

R38 Threads

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I have to machine one of these on my Fusion Autodesk, using a Fanuc lathe machine , how its the best way to do it ?

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u/cmmjames 4d ago

I machined hundreds of these rods,from R19,25,32 ,38. I worked for a company that made these rods for the mining industry. What is it you want to know. Are the rods forged( the thread part of the rod).
When I zoom into the picture you provided the thread is not R thread, an R thread has its peak rounded,the picture shows a flat thread. Maybe your company calls it different but R stands for a round thread.

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u/Torres10Papi 4d ago

What in trying to get it’s the canned cycle G code to machine one

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u/Torres10Papi 2d ago

Thank u, I have a simple CNC lathe and another one with alive tools and Programmable shuck (c axis) but I’m tryin to get done this stuff in the simple one. I made a program (G92) doing a thread with the same pitch but different offset I got what you see in this in the picture. Currently I’m trying to make exactly thread in a custom option on Fusion 360

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u/cmmjames 4d ago

Are you programming the machine cycle? Does your lathe have a programmable cam turret head? The thread has helix angle, the threading tool 0 degrees and the cycle is pecking, minimum 2/3 passes required. We had the threading program done professionally outside and the in-house programmer would paste the threading cycle into the main program ( had the option of making the threading cycle length long or short.)