22 hours ago, crazy^millman said:

Change to one tooth and it will cut from top to bottom on one pass or take the full depth of cut and come up with a total number of teeth needed. Divide that by two and it should be less that what your defining. Let says the hole is 40mm deep and you have a tool that gives you 30mm of teeth depth then I would except to see this. Noe change the number of teeth to give you only 20mm or maybe a little more than one tooth. Take a pitch is 1.75mm and do a little math. I came up with 11.4 teeth needed so I would tell Mastercam in the threading parameters I had 12 teeth and see if that gives me what I am looking for. With the 30mm depth tool and 1.75 mm pitch you would have 17.14 teeth and I would tell it I had 17 teeth to cut the thread. I didn't look up the tool or anything I am just using the numbers to give you an explanation that hopefully give you how I would approach this issue to solve it. Might have to adjust the number of teeth to get what your after.

HTH(Hope that Helps)

Welcome to the Mastercam forum. Have a good day, 

As the total insert length is 40mm, hence it is not recommended to engage the full length of the insert at once. As per the tool specification, the TM cutter can produce 65mm depth whereas the insert length is 40mm. If I put 65mm as final depth in the program, then the tool moves to the final depth at the first pass will damage the tool. 

When I try to make a thread mill program using a multi-tooth inserted thread mill cutter (https://www.secotools.com/article/p_02546918?section=products)  using bottom to top method with multiple axial depth of cut,  the tool moves directly to final depth and then moves to 2nd step. Refer attached video for more details.

If there is a solution already, please comment.