Type of end mill to make round over at top of pocket?

Results 1 to 4 of 4

Thread: Type of end mill to make round over at top of pocket?

  1. #1
    Member
    Join Date
    Aug 2012
    Location
    USA
    Posts
    278
    Downloads
    0
    Uploads
    0

    Default Type of end mill to make round over at top of pocket?

    Could use a ball end mill but this is for a drawing die where the material is pulled over the edge and any waves could be an issue - would need to make the passes very close together as the radius is only about 0.030". I could of course use a corner rounding end mill. Thinking I may want to try different radius numbers but want to minimize the number of cutters to buy. Thinking I could buy the largest radius I expect to need and then make several passes for tighter radius. This will give much smaller ridges than a ball end mill as the curve of the cutting edge is in the same direction as I need. Is this a reasonable plan?

    It's only an initial estimate of the radius. With such a small radius I could put it on by hand but there are some corners (rectangular pocket with radius corners that would make that harder. I also need to do some larger radius of about 0.125 so thinking I may get a large radius tool and a small radius tool (perhaps about 0.060) and try to cover whatever I end up needing with those.

    Similar Threads:
    Last edited by Jim27; 06-28-2021 at 08:25 AM.


  2. #2
    Member machinehop5's Avatar
    Join Date
    Aug 2009
    Location
    United States
    Posts
    1566
    Downloads
    5
    Uploads
    2

    Default Re: Type of end mill to make round over at top of pocket?

    Quote Originally Posted by Jim27 View Post
    Could use a ball end mill but this is for a drawing die where the material is pulled over the edge and any waves could be an issue - would need to make the passes very close together as the radius is only about 0.030". I could of course use a corner rounding end mill. Thinking I may want to try different radius numbers but want to minimize the number of cutters to buy. Thinking I could buy the largest radius I expect to need and then make several passes for tighter radius. This will give much smaller ridges than a ball end mill as the curve of the cutting edge is in the same direction as I need. Is this a reasonable plan?

    It's only an initial estimate of the radius. With such a small radius I could put it on by hand but there are some corners (rectangular pocket with radius corners that would make that harder. I also need to do some larger radius of about 0.125 so thinking I may get a large radius tool and a small radius tool (perhaps about 0.060) and try to cover whatever I end up needing with those.
    ...Kellering ? was old school term for profiling (hand traced)
    https://www.kennametal.com/us/en/abo...ring--and.html



  3. #3
    Member
    Join Date
    Aug 2012
    Location
    USA
    Posts
    278
    Downloads
    0
    Uploads
    0

    Default Re: Type of end mill to make round over at top of pocket?

    Quote Originally Posted by machinehop5 View Post
    ...Kellering ? was old school term for profiling (hand traced)
    https://www.kennametal.com/us/en/abo...ring--and.html
    Interesting video. Not sure how that can be applied to my situation beyond what I laid out - using a slightly oversized corner radius tool to make a radius with less cusp height than using a ball end mill. Seems like the same thing to me and lends support for the basic method.



  4. #4
    Member mactec54's Avatar
    Join Date
    Jan 2005
    Location
    USA
    Posts
    15362
    Downloads
    0
    Uploads
    0

    Default Re: Type of end mill to make round over at top of pocket?

    Quote Originally Posted by Jim27 View Post
    Could use a ball end mill but this is for a drawing die where the material is pulled over the edge and any waves could be an issue - would need to make the passes very close together as the radius is only about 0.030". I could of course use a corner rounding end mill. Thinking I may want to try different radius numbers but want to minimize the number of cutters to buy. Thinking I could buy the largest radius I expect to need and then make several passes for tighter radius. This will give much smaller ridges than a ball end mill as the curve of the cutting edge is in the same direction as I need. Is this a reasonable plan?

    It's only an initial estimate of the radius. With such a small radius I could put it on by hand but there are some corners (rectangular pocket with radius corners that would make that harder. I also need to do some larger radius of about 0.125 so thinking I may get a large radius tool and a small radius tool (perhaps about 0.060) and try to cover whatever I end up needing with those.
    If your step over is like .001 you will get a very smooth radius with a Ball nose mill, so it is all about how much time you want it to take to cut the radius, step over = time, if you need to buy a round over cutter then look at Nine9 brand they are the best there are

    https://nine9.jic-tools.com.tw/corner-rounding.htm

    Mactec54


Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Type of end mill to make round over at top of pocket?

Type of end mill to make round over at top of pocket?