Cutter Depth

[HuFlungDung]

Originally Posted by camminc I guess I should explain, what you see or feel as myself having anger or being ticked, towards something you have quoted. I certainly apologize if my writing has offended you or others. It is not being "Ticked", as more it is more being "You are out of context". First of all, your quotes are very stupid. To be quoted after one writes, (as you do constantly), his or her guts out in the forum is an insult. (Unless ones quotes were accurate, which yours are not). This is the problem I have with you. Why do you exactly "Quote" on subjects you know nothing about? Do you have a problem? I wouldn't exactly call it quoting what you do either, but more giving your - some kind of master un-knowledge? It is very irritating to those of us that wish to write our knowledge and experiences, to debate with others, while not being disputed by your irritating quotes. Secondly, the machines you mention are not of high quality - T&C grinding. I have heard of a Oliver drill pointer and a Darex drill sharpener, but have never heard of a Clarkson tool and cutter grinder. If you were a real tool and cutter grinder, grinding standard drill bits, you would know that you don't need a drill grinder at all, you do it by hand. If you want to really grind form tools, etc you use a - Cincinnati #1 and #2 tool and cutter grinder or Makino would suffice. To do radius you would use Pratt and Whitney or Moonset, otherwise new technology with CNC. You certainly know nothing about T&C grinding. As far as Hsm, you know nothing about it either, so stop your silly quotes. Let the people that have done it speak. What is your problem?

Google not working from your computer, camminc? It is easy to find information on "Clarkson tool and cutter grinders".

As for your other "ramblings", quotation marks (or italics, if you want to bother with the html code) can be used for "emphasis" of a word or phrase. Now with this understanding, you can maybe "sleep at night" instead of getting "cranky" from searching to see "who" I was "quoting".

[camminc]

Hello all. Regardless if it is hard machining, high speed, general material or whatever, nomenclature of the cutting tool is critical for each of these environments. Sharpening tools now and then, using unfamiliar sharpening machines, being an engineer and never really doing it at all, only by reading books, doesn't cut it. You have to be there, experience it.

We did a test, a PHD of machine tool dynamics, using frequency analysis of the cut. A physical impact test was done to provide the correct rpm. A specific depth of cut was then determined by trial cuts with a stock carbide ball end mill cutter, maximum depth of cut in aluminum, to finally achieve chatter. It seemed shallow to me. Of course the PHD that did this test knows little about cutter geometry, he only goes by way of frequency readings of the cut to determine the cutter to be in sync with the tooth passing, which has nothing to do with cutter nomenclature.

To sum it up: Impact testing determines the best possible rpm for that cutter as determined by the frequency of the cut and number of teeth in that machine and cutter assembly, using rpm as a threshold. I told that PHD that I needed to relieve the ball end mill more on the tip, by hand, to possibly achieve more depth of cut. Being a cutter grinder, I felt something. We did this and it cut deeper before chatter occurred again.

Therefore, the results were: Frequency of the correct tooth passing is directly relevant to controlling chatter, (Self excitation of the cutter to jump out of cut) regardless of material being machined, yet nomenclature of a cutter - limits material removal rate in materials. MRR.

Conclusion: You can determine correct RPM by way of impact testing or audio harmonics, but it has nothing to do with the cutter nomenclature of a cutter being used. Impact testing and audio harmonics can only give you the correct rpm to achieve phase. It then comes down to the tool tip and what occurs at that point that might excite the assembly - causing deterioration of MRR.

Point: Yes, it is relevant what machine is used to sharpen a cutter, HSM or conventional. Once again - CNC control of the machine has nothing to do with the cutter tip doing it's job.