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Multistart threading - knurling surface CNC Lathe

gvinplen
Explorer

Multistart threading - knurling surface CNC Lathe

gvinplen
Explorer
Explorer

Hi. Is there a way to create multistart threading cycle with FeatureCam with Lathe machine? I want to create knurling surface with single point thread tool. Was searching some solution on internet but.... We have HAAS ST30 (Fanuc) in our workshop. I guess that G32 option would be the answer to our problem. Maybe G76 would do the job but than again it would require one program to go from right to left and second program to go from left to right in Z axis, with same X,F,K,D values to create knurling surface. With G32 i guess will go only with changes in Z values +/- . Basically, is there a way to program this with FeatureCam, with multiple starts of threading cycle (probably more than 40 starts ) ? Challenge is to use the single point thread tool, not knurling tool. Thank you.

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bhorstTGM48
Collaborator
Collaborator

I use this to get multi start threads.

 

 

Start threads — If set to 1, a single thread is created. If set to 2 or 3, multiple start threads are created. The number of threads per inch (or per mm) for each thread is divided by the number of threads. For example, if you create a thread with 10 threads per inch with 2 start threads, then each thread is 5 threads per inch 180

 

 apart.

 

2023-11-15_09-32-47.png

gvinplen
Explorer
Explorer

Thank you @bhorstTGM48 for your reply.I watched some video clips on YouTube and I noticed that their starting position along the Z axis is constant or with very little variation. If the pitch of the thread is, say, 2mm and I have 3 starts of that thread, then F6.0 (2mm pitch X 3 thread starts), is constant for me and the position of the Z coordinate changes. . Let's say it starts with Z=1mm, then Z=3mm, then Z=5mm. Now if we implement this for a knurling surface of some diameter of 20mm, where let's say the thread pitch is calculated as 50 and then my Z would be Z=1mm, then Z=51mm, and then Z=101mm and so on. Something is not right. The G32 command does the same as G76