Face groove cnc lathe

[maguilera]

I need to do a face groove (drawing attached), the tool holder is MTENN2020K16, insert TNMG160408MS KCU25.
I programmed the tool approaching the part at a 30 degree angle with a DOC of 1mm, feed of 0.15mm/rev and cutting speed of 120m/min and left 0.2mm for a finishing pass, the material to be machined is carbon steel.
I have no experience with face grooving, so I have some questions
Is it 0.2mm for finishing enough?
What about the feeds and speeds, should I change anything?
What optimizations would you guys do to this program?
Thanks
( FACE GROOVE )
T0707
G54
/G92 S700
/G96 S120 M4
G0 X95 Z5
X78.924
G1 Z2 F0.15
X75.46 Z-1
X64.54
Z2
G0 X78.924
G1 X74.305 Z-2
X65.695
Z2
G0 X78.924
G1 X73.381 Z-2.8
X66.619
Z2
G0 X79.155
G1 Z0
G2 X76.037 Z-0.9 R1 F0.1
G1 X73.612 Z-3
X69
Z2
X60.845
Z0
G2 X63.963 Z-0.9 R1
G1 X66.388 Z-3
X70
G0 Z5
X95
G53 G0 X350 Z440 M9

 

[DouglasJRizzo]

.2mm is adequate for finish of the groove.
How far out is the part extending from the chuck? Vibration and chatter will clobber a groove tool.

 

[doug925]

Yes, the finish allowance should be okay. The F0.15 IPR (0.0059") seems okay. The SFM seems low, but I don't know the properties of the carbon you are cutting.

If you have not, you may want to check clearance on the sides of the tool. Most *standard* OD, stick tools are not ground for face work, and have no relief under the insert seat to clear the groove. You can do it with a quick swipe on the grinder.

Have a look at the picture. You will see the toolholder is ground with a radius below the insert. You will need clearance on the ID and OD side of your tool.

 

[maguilera]

About 40mm on a 88mm diameter with a 37mm bore.

 

[maguilera]

I had not checked for the clearance on the tool holder, I'll definitely check this out.
Thanks for the reply

 

[Fancuku]

I don't think the tool that you are thinking to use will have the necessary clearance. Use a proper face grooving tool.

 

[CarbideBob]

Tnmg160408ms ???

 

[MaxPrairie]

Tnmg160408ms ???

Yeah, that insert and holder are not going to work. If you picture as the od of the face groove comes around it would rub on the insert and the holder. I do face grooves with either a solid carbide or indexable like the one doug has shown. Here is a link for some I have used. Indexable holders will have a range of diameter they work in again due to clearance. I have also made my own face groove by making a pocket and using an sdmt insert and using a belt sander for my radius relief.

Face Grooving Tools - Series 73

 

[maguilera]

Thanks for the input everyone. The shop owner actually bought a proper face grooving holder.
The reason I thought about doing that way is because this is a one off job and I was trying to get the job done with what I had available.
Anyways, thanks again!