How do you balance CNC feed and speed with tool life and wear?

Regarding lathe and turning work, too high of cutting speed is the number one killer of cutting tools. Feed rate is second, followed by depth of cut.

One thing I consider key is to start with tool manufacturer recommendations for the material being machined and use that to find the best combination of F and S that minimizes tool changes while maintaining product conformance to dimensional and cosmetic specifications.

Speed and feed are the combined effect of the spinnies plus the go-ies. The faster the better. Just have to find the balance that still makes a good part while not destroying the tools or part. PUSH IT!!

To recommend the speed/feed for turning Ti6/4 from a diameter of .5626" down to .2165", I'd need to know the specific cutting tool, machine setup, and desired surface finish. Generally, for Ti6/4, a cutting speed of 80-200 sfm and a feed rate of 0.005-0.020 ipr are common starting points. These values can be adjusted based on the specific machining conditions and tooling used. Though speeds and feeds are the gross adjustment. Fine adjustments are what result in a conforming product.

I'm retired now so it's not an issue, I machined a lot of titanium during my career. The vast majority of the new inserts for titanium were no improvement over the old inserts. You could run them a little faster, but you had a much reduced feed rate and depth of cut. Our go-to insert was one that they kept making obsolete, never mind the material removal rate was at least double of the new whiz-bang insert, and the time in cut was two to three times longer.

Run too slow and you get low chip thickness and cause excessive tool wear, run too fast and you are causing excessive force on the cutter that could lead to tool breakage or tool deflection and chatter which affects the part finish. If you can maintain the chip thickness constant by varying the feed rates to go faster when the load is less and slow down when more material is encountered, you will extend your tool life by more than 50% and save between 15 and 30% on your cycle time.

One thing I would Add is if the feed and speeds are too low you could see increased tool wear. Most cutting insert companies have a minimum and maximum speed and feeds for their inserts for the material type.

Avanço e RPM é de extrema importância para vida útil da ferramenta, mas existem outros fatores que avanço e RPM também contribui na usinagem, e uma dessas é a pressão de corte. Aço ligas tem pressão de corte maior, sendo necessário usar avanço e RPM menores (4340, 4150, VND, H13,D2...etc), aços sem taxas significativas de elemento de liga (1020, 1045, A36...etc) é necessário ter velocidades de corte mais alta para chegar na mesma pressão de corte que aço liga e dessa forma ter um bom acabamento.

The “COM” (couple tool-material) methodology A methodology for machinahility measurement have been developed since the 80's : The Couple Tool-Material (COM) method, also known as the "Méthode Couple Outil-Matière" in French, is a standardized approach primarily used in machining processes such as turning and milling. It's defined by the NF E 66-520 standard in France. This method helps in selecting the appropriate cutting tool material based on the material being machined, aiming for optimal machining performance in terms of tool life, cutting speed.

When tool wears you increase the likelihood of chatter from vibration a way that can cure this is to increase tool cutting pressure. You can achieve this by slowing the speed snd increase the feed

One thing that is helpful is not assuming coolant flood is automatically necessary. Remove the heat save the tool. At times, some popular insert grades perform and last longer than with coolant. The heat generated from cutting with addition too coolant can cause micro fracturing in the insert or tool, which in turn will reduce cutting life....

На мой взгляд, самое важное - это придерживаться технических характеристик инструмента. Всё самое важное будет указано в документации при покупке пластинок или сверел. У каждого инструмента своя геометрия и важно использовать обороты и подачи те которые рекомендуют. Но и следить за качеством охлаждения. На мой взгляд это фундаментально.

Some of the statements are a little unrealistic. Especially when talking about the right coolant for the job as well using the right machine rigidity for the job. So a good rule of thumb on CNC machines is create the most rigid set up possible for what is available to you. When using coolants (whether they are synthetic or water soluble or maybe even a hybrid). You need to determine if you need the cooling or the lubrication more for your application. Gummier materials tend to need a little more lubricity where harder materials create more heat. These are levers that most of us can control at our shops.

Utilize the load meter if available on your machine as well. This can tell you if your b tool is wearing and help you determine tool life.

Interesting, and I don’t even pretend to be a machinist. I have always been amazed at a good machinist “flies” by hearing. I have also seen the added cost for a heavy, rigid machine justified by extended tool life. There is a lot to be said about a well designed and rigid machine tool.

I would say it depends on the type Of machining line you have. If you only have 1 part of the line, I would say use the a part count. If you have many products on the line and you are using all tool with specific engagement use time. If you have a monitoring system like tmac or tcc (dmg mori option) using the bending moment can be an option you can start looking.