Tool holder flats not parallel with insert

[matzo]

I bought an inside threading tool and insert from Banggood. The flats on the tool holder are not parallel with the insert. When the tool is secured in a AXA holder the insert sits at a noticeable downturn. This doesn't look right, I have never seen this before. In all of my other indexable thread tools the flats and insert are parallel.

 

[MrWhoopee]

That's how it's supposed to be. It puts the cutting edge at the center-line of the bar and sets the proper angles and clearances.

 

[DavidR8]

Yup that's exactly like mine.

 

[Liljoebrshooter]

Clearance Clarence.

Joe

 

[graham-xrf]

Hi @matzo
I also thought this, but think it through for using inserts. Suppose the holder was parallel. Then, to get the correct clearance under the tool so it doesn't rub, and other cutting angles set good, the shape of the insert would have to be much the same as when you grind a good HSS tool, not reversible!

By making the holder itself tilt downwards, and shaping the top of the insert to get the cut angle, and include chip breakers, the insert need not be made with any clearance angle, since that is already provided by the downward tilt. The insert might have two or three separate points to use, just by rotating , and then can be turned over, and use more points from the underside. Four or six points per insert is efficient.

I do notice that this type of tool holder is expensive!

 

[matzo]

Hi @matzo
I also thought this, but think it through for using inserts. Suppose the holder was parallel. Then, to get the correct clearance under the tool so it doesn't rub, and other cutting angles set good, the shape of the insert would have to be much the same as when you grind a good HSS tool, not reversible!

By making the holder itself tilt downwards, and shaping the top of the insert to get the cut angle, and include chip breakers, the insert need not be made with any clearance angle, since that is already provided by the downward tilt. The insert might have two or three separate points to use, just by rotating , and then can be turned over, and use more points from the underside. Four or six points per insert is efficient.

I do notice that this type of tool holder is expensive!

Thanks, but don't you lose some depth of cut with this configuration?

 

[eugene13]

I bought an inside threading tool and insert from Banggood. The flats on the tool holder are not parallel with the insert. When the tool is secured in a AXA holder the insert sits at a noticeable downturn. This doesn't look right, I have never seen this before. In all of my other indexable thread tools the flats and insert are parallel.

Let us know how good they work.

 

[matzo]

Well I went out to the shop and cut some threads, it works very well. My concern over depth of cut is not an issue.

Thanks Everybody

 

[matzo]

Well I went out to the shop and cut some threads, it works very well. My concern over depth of cut is not an issue.

Thanks Everybody

As Graham XRF pointed out, the insert has know clearance, hence the the down slope for clearance and the ability to get six cutting points out of one insert.

 

[darkzero]

the ability to get six cutting points out of one insert.

Those IR style inserts will only give you 3 cutting tips, they can't be flipped upside down.