Optimum Cutting Speed, Feed and Depth Of Cut calculation
Optimum Cutting Speed, Feed and Depth Of Cut calculation
(OP)
Everyone,
Need some advise on how to calculate the optimum cutting speed, feed and depth of cut for machining:
Operation - Facing BUT "NOT single point cutting" - It is "Plunge Facing" with R5 Insert
Machine - Vertical Lathe
Job Specifications - variable diameters and thickness.
How would we be able to determine job rotation speeds and feed rates to get optimum tool life and better machining?
Need some advise on how to calculate the optimum cutting speed, feed and depth of cut for machining:
Operation - Facing BUT "NOT single point cutting" - It is "Plunge Facing" with R5 Insert
Machine - Vertical Lathe
Job Specifications - variable diameters and thickness.
How would we be able to determine job rotation speeds and feed rates to get optimum tool life and better machining?





RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
Some people like to buy cheap inserts and make them last forever. Think hobbyists. Some people want to run as fast as possible and don’t care how long the inserts last. Think Boeing trying to optimize output from a $50 million dollar mill
An awful lot of time and money is lost in the world every day because purchasing / management thinks tooling is expensive but machine time and labor are not important.
Start with Machinery Handbook, the cutting tool supplier's recommendation and the material supplier's recommendation then experiment.
Put a really good operator on it, one who is very familiar with the machine. Get QC involved for cut quality.
Find out just how strong your fixturing is before you start.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
What is the material? What condition annealed, normalized, heat treated? If this is a casting is there inclusions(cast austinetic stainless)?
How rigid is the setup?
How long does it take to change a tool?
What is the cost of the raw material(part)?
What is the hourly rate on the machine?
What is the hourly rate of the man?
You will have to determine your optimum costs. Rigidity of the setup and material are probably your most important parameters starting out then with experience machine and labor costs become the deciding factors.
High dollar part costs will also drive you to never have a catistrophic insert failure insert failure which scraps the part.
Good Luck
Bill
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
More than anything else right now I would be only interested in theoretically calculating speed and feed data to determine if we indeed are somewhere near those. The suppliers in India are not much useful as they tend to do more trial and error than have any justified theoretical logical behind them.
Yes, do understand the calculated values would vary in practical conditions but believe they should be used as a basis behind any judgement.
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
We asked them how they arrived at their speeds, and feeds? The answer came back, "we run the feed up until the tool breaks, then back off 10%.".
B.E.
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
If you're working for a large company then it would be possible to acquire such softwares.
RE: Optimum Cutting Speed, Feed and Depth Of Cut calculation
It's not the only thing you should measure, but it can help you find process steps where there's room to improve.
Mike Halloran
Pembroke Pines, FL, USA