How would you make this part in MCAM Lathe?

[SRT Mike]

I have been using MCAM X3 for mill for about a year, but am just starting out with Lathe.

I have the part pictured below... I figured out how to setup my stock, but this part is giving me problems. This part is 0.5" at it's largest point and around 3" long. The small stalk on the right is a 1/4"-20 thread and there is a 0.100" drill down the center of the threaded portion, to a depth of 1.25".

Basically I would like to use a straight (MVNN 35-degree diamond insert) to profile this part, leaving maybe 1/8" on the left side. I can't get the program to work right. First, when I use a straight cutter and set compensation to right, it skips the dip (the first curve, when going from right to left). It will let me do that dip as a grooving operation, but it goes toolwidth by toolwidth in Z and cuts down at each Z point in the Y, creating a "staircase" approximation of the curve, then it smoothes it out with a finish pass.

That has to be the most inefficient toolpath you could use. I would really like to do this in a single set-up. I would just hand-code it except I have the original part in Solidworks, and the curves on the part are splines, so it is much easier to let MCAM figure out all the arcs rather than me try to do it. But I can't get it to work as I want.

Any tips? What operations would you do to make this part?

[valmet58]

in your rough parameters you have to click on plunge parameters.then try one of the options ( 3rd to the right?)

[cob]

on what type of machine are you machining this part.
also I think the way I would go about doing this part would be is do the profile of this part from the bullet nose first then flip the part around and finnish the overall height and do the treaded end last .
so for me this would be a two opperation part.
hope that is some kind of help

[littlebrewman]

i would have to agree with cob on this one unless you have a dual spindle dual tool turret machine then i would transfer and cut off the part and finish the thread last.if you can get me a drawing with dimensions i can put a program together for you with tooling suggestions if you tell me ur machine type.