Insert feedrate and depth of cut.

[jheal2]

Just a general past experiences question. I know this has many variables but when machining, If the ISCAR book gives a range for feedrate and depth of cut for an insert, what percentage of that range would you use when roughing. Mostly turning, but milling answers are very helpful too!

Ex. CNMG 431-GN
f= .006- .017 (75% of range would be .01425)

 

[MikeHalloran]

If the machine has enough power and the workpiece and machine have the rigidity, I'd use _all_ of the recommended feedrate and depth.



Mike Halloran
Pembroke Pines, FL, USA

 

[saberblue]

If the insert has a built in chip breaker then a depth of cut out side the insert makers recommendation will probably render the chip breaker useless

 

[jheal2]

Mike- I like your thinking. Give it all it has. I just wasnt sure if this would, in your past experiences, dramatically decrease the tool life, or have any other negative effects. Or else everybody would always take the highest recommendeds for roughing.

Saber- I never had plans of going outside of the recomendations, I just wasnt sure when reading the recommendations, which side of the spectrum to work to, the higher or the lower of it.

Thanks
Jordan

 

[MikeHalloran]

The tool and insert manufacturers do a lot of research to come up with the numbers; use them to the fullest.

Cutting tool salesmen are not like used car salesmen.
They will help you get the most out of what you're buying, even if you're not buying a lot, because you'll buy more when you sell more.
They may recommend different grades of inserts that will allow even higher production rates.
Don't hesitate to call them for help.



Mike Halloran
Pembroke Pines, FL, USA

 

[mrainey]

Note that your example insert, a CNMG-431, would seldom be used for roughing in the first place. A 1/64 radius is relatively fragile. It's generally used for finishing, and even then only when needed to get a good finish (ex. a thin-walled part) or when dictated by the geometry of the workpiece (ex. a 1/64 max fillet radius).

Software For Metalworking

http://closetolerancesoftware.com

 

[Jaydenn]

Most insert makers will tell you that the recommended parameters are based on XX tool life(time in minutes).

So, if you use the max speeds and feeds you can expect a certain tool life.

Read the catalogue and try to find that figure.

That being said, I always go Full Depth and Play with the feed until I'm happy.

Jay

NX 6.0.5.3

 

[looslib]

Most CNC machines have a speed override control to slow the feedrate down. I used to program for about 80% of the max on depth/feed/speed and then let the operator use the overrides on speed and feeds.

Did have a few accidents when experimenting with some cuts at the limits as recommended by the insert rep.

I will also backup what was said about tooling reps, most of them do know what they are doing.



What's the difference between a car salesman and a computer salesman?
The car salesman knows when he's lying.


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Ben Loosli