1/8" Roughing End Mill? - Page 4
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  1. #61
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    Quote Originally Posted by ChipSplitter View Post
    But we have no clue what his program looks like. Everyone told him to use at least a 4-fluter, but no, he wanted to use a 2 .........

    AND, he is milling at a blistering 3.5 IPM. Nothing like that for being productive......

    I'm outa here. This is completely a waste of everyone's time.
    I get the feeling this is a fairly new guy with no idea of what he doesn't know, so he doesn't even know enough to know how frustrating it is for us to not know what he knows, and why he won't let us know what he knows, and why he won't let us make him know what we know.

    We were all new once.

    I certainly never made a bad program. The collet on my desk with a piece of .129"Ø stock welded into it because I closed the sub spindle at a dead stop while the main was spinning 9K RPM is a reminder of how OTHER people make mistakes. Not me.

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  3. #62
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    Quote Originally Posted by TeachMePlease View Post
    I get the feeling this is a fairly new guy with no idea of what he doesn't know, so he doesn't even know enough to know how frustrating it is for us to not know what he knows, and why he won't let us know what he knows, and why he won't let us make him know what we know.

    We were all new once.

    I certainly never made a bad program. The collet on my desk with a piece of .129"Ø stock welded into it because I closed the sub spindle at a dead stop while the main was spinning 9K RPM is a reminder of how OTHER people make mistakes. Not me.

    Man, you almost got me cross-eyed trying to read your first paragraph.

    And no, I'm not blaming the OP for being new. We all had to start somewhere. But machining is all about the numbers.
    If we don't have the numbers we need, we might as well use our crystal ball........

  4. #63
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    Quote Originally Posted by ChipSplitter View Post
    Man, you almost got me cross-eyed trying to read your first paragraph.

    And no, I'm not blaming the OP for being new. We all had to start somewhere. But machining is all about the numbers.
    If we don't have the numbers we need, we might as well use our crystal ball........
    That was the goal! I was hitting the point of semantic satiation (Link for the curious: Semantic satiation - Wikipedia ) typing it out. I was trying to make everyone else's brains do the same


    To the OP:

    You have been given lots of good advice. You have seemingly done mostly the opposite of what was suggested.

    The members here have, collectively, millenia of machining experience. Most of us are what you would call "experts" or at least "very, very good" at our trade. Many of us don't take it well when someone asks for advice, and then does the opposite of what we suggest, and complains that it's not working. See this thread for very current information on this phenomenon, and what we sometimes call "askholes": Ot: has everyone just learned to not give technical advice? (Note, you are not an askhole. Yet.)

    So the people expressing frustration with you are not wrong to do so. However, I think you're trying, so I'm wiling to keep helping.


    So, some pointers about how most of us think in regard to cutting metal:

    First, RPM doesn't matter. Nobody cares about RPM. It's all about surface footage. That's the real number we need. If you don't know what surface footage is, google it. If that doesn't answer your questions, ask here, I'll give a detailed answer.

    Second: IPM/FPM doesn't matter. Nobody cares about FPM. It's all bout chipload per tooth. That's the real number we need.

    Third: There is such a thing as too small of a chipload. Sure, nobody wants to break an endmill by feeding it at .010" per tooth... But you can rub one to death by feeding it at .0001" per tooth, too. (Unless you're me, using an .015" endmill... Then .0001" per tooth works).

    Fourth:..... SQUIRREL!

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  6. #64
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    Quote Originally Posted by TeachMePlease View Post
    That was the goal! I was hitting the point of semantic satiation (Link for the curious: Semantic satiation - Wikipedia ) typing it out. I was trying to make everyone else's brains do the same
    If the OP won't take advice from the advisious advisers I would advise him to find an adviser closer to him that can give advice without being accused as an egoistic adviser. The advice he has been given was good advise but he went against the advice against everyone's advice and will reap the consequences of not following the advice given by advisers that recommended to follow other adviser's advice.

    There.

    I can play, too......

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  8. #65
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    Listen, pay attention.Listen, pay attention.Listen, pay attention.Listen, pay attention.Listen, pay attention.Listen, pay attentionListen, pay attentionListen, pay attentionListen, pay attentionListen, pay attentionListen, pay attention.....

    Is it working?

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  10. #66
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    Might have been said but tool runout. Better be straight for that or it’s going to be hard on tools regardless


    Sent from my iPhone using Tapatalk

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    Re reading this thread today makes me cringe. I have since gone to school and realize how dumb i really sounded in this thread. I do appreciate a lot of the help i received on here. I still have a ton to learn but i am 26 and more than happy to admit i have not even scratched the surface of machining. But, im learning more everyday! Happy to take any and all information if it helps me grow. Thank you for being so gracious to me (even if it was like talking to a bag of rocks).

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  13. #68
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    I'm 63, been machining (or at least in shop class) since tech HS. I still try to learn every day, which is one of the reasons I hang around this den of villainy.

    If I can teach something, it's rewarding. If I learn something, it's invigorating. If there's a chance that one or the other makes the world a tiny bit better place, then it's a good reason to wake up each day.

  14. #69
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    I didn’t make a single mistake or write a single bad program today (I took the day off).

    The longer I’m in this trade, the more I realize how little I know.


    Sent from my iPhone using Tapatalk

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  16. #70
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    Quote Originally Posted by Bluechipx View Post
    Whoa! I didn't realize a six flute had such a beefy core. They look like there is not much room for chip evac. Anybody got actual experience with them? Pro and con?
    (Apologies if remedial)
    CAVEAT: I have never run a 6 flute under Ø3/8"

    4140, 4130, 4340: Annealed to Rc36
    Yes, we run 6 flute mills, but only profiling.
    A Six flute (as you stated) has no room for chip evacuation. They do not like slotting at all.

    We keep 4 flutes to 33-45% radial, 5 flute mills to 15-20%, and 6 flutes to 5-15%.

    The DOC is chosen by what the feature, endmill, work & tool holding will allow.
    The feedrate is radial chip thinned for the % stepover.
    In 4140CHT we run around 350 - 550 SFM depending on the stepover as well. The less radial step (the less friction) and the allowance for a higher SFM.

    Doug


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