DAMAGING the Cutter by Feeding it Too SLOW

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[gooblio]

Couldn't have said it better myself. If you're making the right size chip in some materials you can dry cut and the chips are glowing hot, but when you touch the part after a cut it's cool.
Lower feeds generate more heat and the last thing you want to do in materials like titanium is heat up your part or tool.

[cryptonian]

one of the best videos. ya'll have made. i try to teach this nearly every day

[johndonlan]

This video is one of the most helpful that I've come across! 40 years ago when I first started CNC programming I basically cut my teeth on super alloys:. Hastelloy C, Hastelloy B, Monel 400, etc. And I found myself doing exactly the same thing that this video talks about. The carbide inserts we're wearing out very quickly, so my first instinct was to reduce the feed rate.... Which, since these were work hardening metals, only served to precipitate the hardening feature to greater degree. Hence, I was making the situation worse. But unlike today, I did not have the benefit of any of these wonderful videos to help me along and show me the correct way to change things.

[DolezalPetr]

Yeah yeah yeah cool... Make a video about the best BOOMs Titan ever said

[dspannplayspiano]

Very enlightening...I am super guilty of this and am working to correct it. Keeping in mind that you should direct the heat transfer to the chip, by not cutting too little, is the key here. Thanks!

[Imba-gtqi]

Even with a small Spindle sometimes you get better results when going more aggresive. Hint: you forgot to say BOOMM :-)

[tbarnes]

The same can be said with precision grinding. Aggressive delicacy.

[jeffwombold]

I've had to explain this principle many times. The force vector imposed on the insert has to enter the body of the insert. Realizing this is one of the best ways to understand it. Too slow or too thin ends up pushing the force vector past the insert surface and simply runs it flat, which can happen almost instantly as soon as the underfed cut begins. Then once they increase the feed or speed, you're already try to cut with a dulled insert. Applies to all tools, including drills etc. High speed tooling as well.

[Hose]

I figured this out the hard way a long time ago while hogging copper. Another machinist that had small man's disease raised hell because I increased the feed rate. I simply followed what the manufacturer suggested for the insert tool, whereas he wanted to run it like a high speed steel tool. Overall, I cut part to part time by half... he really lost it when I did that. lol I guess he thought it made him look bad since at that time I had been machining about a year at and he had been machining about a decade. If it did it was just the icing on the cake, I just wanted to machine it the best it could be with the equipment we had.

Edit: I miss machining

[TheTheo]

Quite interesting, the chips produced by the milling/cutting processes are like tiny heat blotters which pull the heat away from the work and cutter surfaces. With the cutting lubricant keeping the work cool to allow easier milling/cutting/threading.

[gary]

A higher feed uses less energy. Less energy equals less heat. Thanks for your high quality videos and thanks for coming to Texas.

[mythattak]

That accent is thicker than the chips you guys are making! haha anyways, Thanks for the pro tips!

[nhrifle]

This is the advice needed in the trade. Thank you for sharing!

[tarehjernetarehjerne]

If you look at an insert, it has a little burr on its edge. If your feed is smaller than that burr it will rub.

[BenRyherd]

I've been told you have to be careful of these same kinds of "machining sins" when you're running plastic; not because of work hardening, but because not pulling enough heat out in chips will melt or soften the plastic, gum up tooling and decrease precision from cutting mushy material, possibly also burning it as well.

[Qui_Gon_Ben]

More CONTENT like this please, and thank you!

[maltbie]

Thank you for your explanation. Charles

[peterfoldesi]

I used to mill hardened steel(above 50-60hrc) with normal endmills, which was good up to around 45hrc

In roughing where chips was coming off the tool lasted for hours sometimes, but if I started a finishing pass with the same type of tool, it died in minutes

They don't like to rub the material, a certain minimum of feedrate should be used to extend tool life, especially in hard materials

[brandon]

can you guys make a video how you calculate your feeds and speeds and DOC on lathes and mills

[piter_sk]

radial DOC 1mm, S160m/min F0.22 mm/rev.... The insert tip wore down radial DOC 2.5mm, S180m/min, F0.3mm/rev? Insert lasted all 44 pieces, with nail you can´t feel anything different on tip