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End mill leaving a line in the middle

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by jmx66, Aug 6, 2017.

  1. jmx66

    jmx66 United States Active Member Active Member

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    I have this carbide endmill and it leaves a line in the middle of the work. Is there anything that can be done about it?
    [​IMG]
     
  2. dave_r_1

    dave_r_1 Canada Active Member Active Member

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    Shift the endmill a little sideways, relative to the work, then the line won't be down the middle. :hammer:
     
    BGHansen likes this.
  3. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    That's also happened to me and never knew why. What I ended up doing is taking three cutting passes instead of two and it seemed to help. No idea why.
     
  4. rgray

    rgray Active User H-M Supporter-Premium

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    One of the cutting edges is lower (longer)in the center ??? Relieve it and the line will go away. Just my guess, it's 3:00 am so possible I'm not awake fully.
     
  5. British Steel

    British Steel United Kingdom Active User Active Member

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    Is it a groove or a ridge? If it's a groove then Russ probably has it, the centre-cutting edge has a pip that you could take off with a diamond lap, if it's a ridge... Ye cannae change the laws of Physics (or Geometry), Cap'n! and I can't see how that could happen...

    Dave H. (the other one)
     
  6. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    Take you your flat file and draw file the surface little, with a very light force and smooth out the ridge and you should be good!
     
    jmx66 and kd4gij like this.
  7. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    From the patterns of the cutter's path, it just about has to be a pip sticking out in the middle of the end mill. A round or similarly shaped diamond Dremel tool would make quick work of it.
     
    jmx66, Ulma Doctor and 4gsr like this.
  8. jmx66

    jmx66 United States Active Member Active Member

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    Thanks guys! Will give it a shot and report the result.
     
  9. Silverbullet

    Silverbullet Active Member Active Member

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    Looks to me to be a burr rub off one cutter blade.
     
  10. jmx66

    jmx66 United States Active Member Active Member

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    Yep, put it under a magnifier and found it. Hit it with Dremel and now good as new. Thanks again.
     
  11. Wreck™Wreck

    Wreck™Wreck United States Active User H-M Supporter-Premium

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    In 30 years working in the business I have never seen a milling machine that will not leave visual artifacts at the bottom of a pocket made with an end mill regardless of the cost of the tool or machine, what the human eye can see is well beyond sub-micron levels of surface finish, you can't feel it and you can't easily measure it but it is easily seen. End mills are hollow ground on the end for this reason, the edges cut and you are not dragging the not cutting part across the work. I suspect that very low end tool manufacturers/marketers do not do this. Buy an $80.00 tool and do the same job then report back and let us know how it worked.
     
    Ken from ontario likes this.

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