Hi Steve,

Here's my take on G76:

> I don't understand the implementation method,  in particular the  "drive
> line" mentioned in the manual.

The drive line is the safe clearance outside the thread. It is the 
current X axis position when you call G76. I normally use thread peak + 
1mm.

I is the distance from the drive line to the thread peak
K is the distance from the thread peak to the thread root (cut depth)

> Was that program written for radius mode?

Undoubtedly. Diameter mode is pretty recent.

> 
> Wouldn't a XZ start point and an XZ end point and a return clearance
> distance have been more practical?  

And less confusing. G76 gets the job done for parallel threads but you 
do have to really think about it.

> 
> It would appear from the parameters that the G76 doesn't support taper
> threads.

No it doesn't. I had to do a taper thread today and the only way was 
with G33.

Les

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