thdfirst

[Leandro]

I´m trying to modified my Lathe post.

I¨m using a standard Fanuc 2 Axis post.

One of my parameters is First depth.

In my example Total depth is 5 mm and Equal area passes are 5.

I get as result for thdfirst D=2.151

This value is comming from the NCI 0,215014.....

What do this value represent ???

This is not 5/Sqr 5

Actually what is the formula that Masteram use to do this calculation?

 

Thanks

[BrianCNC]

The value represents the depth of the first threading pass and the passes will get smaller as you reach the final diameter of your thread. I do not know how Mastercam caluclates the depth of the first thread, but if you run it in backplot and watch the coordinates at the bottom of the screen you should see the first path being the depth you stated above. If you need to reduce it you will have to select more passes.