Tool tip location incorrect

[Silv3rDragon]

We have ISCAR indexable drills that we use in a CNC lathe.  We use the outer insert to touch off the tool and set it up like a boring bar as the shorter 2D drills work great for that to save on tool changes and setup time in the machine (3D can work but longer than that is generally not rigid enough).  Originally when we set all these up the point that it made all the gcode calculations from was farther forward (where the red line is on the bottom picture) and that was with "tip tangent" for compensation point but tip tangent is now even farther back than just "tip".  With the negative holder angle, "tip" compensation does not work for touching off in the machine so is there any way to fix this?  We have a large number of jobs setup like this so changing the tool paths in the setups is not an option though we could go through and re select tools that have been fixed.

Thanks for any help

Drill in question https://www.iscar.com/eCatalog/Item.aspx?cat=3201401&fnum=2226&mapp=DR&GFSTYP=I&srch=1 

[emre_sahin9PU3F]

Hi,

Are you planning to use this drill only for drilling, or for both drilling and turning? With the new features in Fusion, you can add tools with GTC file extensions to the library. Download the models from the manufacturers (Iscar, Tungaloy, Sandvik, etc.) if available. If you have a sample GTC file, I can show you how to use it. The P21 file extension is available for Insider but not for normal Fusion. For now, GTC is available.

[Silv3rDragon]

I've not heard of or used the GTC extension before.  Is that a file extension for what you would download from the tool manufacturers site?

edit:  will be used for drilling and turning in the same opperation

[seth.madore]

It's not likely that a GTC or P21 file is going to get you anything different than what Fusion is currently giving you

[emre_sahin9PU3F]

Hi,

"If I were in your position, I would do the following: First, I would define the tool as a drill and perform the drilling operation. I would define it in the machine as T0101. Then, I would define this tool for internal turning. I would also define this tool as T0102 in both the machine and Fusion. The key point to pay attention to is ensuring that the diameter defined for the U-drill and the width of the internal turning operation are close to or the same as each other.

No matter what tip compensation you do on the J-type cutter you choose, you cannot get the result you want. 

I think you can try it with 'L' type tip and 'G' type bit while introducing the u drill as a bit.