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Thread: question on deep cutting

  1. #1
    Join Date
    Jun 2016
    Posts
    11

    Default question on deep cutting

    could anyone share their thoughts on speeds/feeds and bit stickout when cutting deep cuts.

    I have a hypothetical situation where i am trying to understand how one would cut a reverse mold (in foam) possibly 3" deep.

    which bit and feeds/speeds would be used? especially taking into account bit stickout.

    same question and probably more specifically - what about using a long ballnose to do the cleanup at this kind of depth (feeds/speeds, stickout)


    anyone care to chime in on this one?

  2. #2
    Join Date
    Mar 2013
    Location
    Memphis TN
    Posts
    719

    Default

    I have a specialty end mill from Amana for doing foam. It's got a max RPM of only 6,000 so it requires a spindle to work. These end mills cut very cleanly and make a minimum of mess. For finish, I use an extra long ball nose. It seems that for foam, 1/2" end mills work best. If you're using a super dense foam, smaller end mills would probably work without tearout.

    My take on foam is big end mills, low RPM's, faster speeds (6-8 IPS) yield a good quality cut.

    Foam cutting generates a lot of static electricity so be aware of that.
    ShopBot Details:
    PRS Alpha 96x60x12
    4hp Spindle
    12" indexer
    Aspire
    Rhino

  3. #3
    Join Date
    Jun 2016
    Posts
    11

    Default

    Quote Originally Posted by coryatjohn View Post
    I have a specialty end mill from Amana for doing foam. It's got a max RPM of only 6,000 so it requires a spindle to work. These end mills cut very cleanly and make a minimum of mess. For finish, I use an extra long ball nose. It seems that for foam, 1/2" end mills work best. If you're using a super dense foam, smaller end mills would probably work without tearout.

    My take on foam is big end mills, low RPM's, faster speeds (6-8 IPS) yield a good quality cut.

    Foam cutting generates a lot of static electricity so be aware of that.
    Thanks much for the response! care to share what number that endmill is?

  4. #4
    Join Date
    Mar 2013
    Location
    Memphis TN
    Posts
    719

    Default

    Amana Tool HSS1214 Foam Cutting Square End 1/2 D x 6 CH x 1/2 SHK x 8 Inch Long Extended Reach CNC High Speed Steel (HSS) TiN Coated 4-Flute Spiral Up-Cut Router Bit

    This one.
    ShopBot Details:
    PRS Alpha 96x60x12
    4hp Spindle
    12" indexer
    Aspire
    Rhino

  5. #5
    Join Date
    Jun 2016
    Posts
    11

    Default

    Quote Originally Posted by coryatjohn View Post
    Amana Tool HSS1214 Foam Cutting Square End 1/2 D x 6 CH x 1/2 SHK x 8 Inch Long Extended Reach CNC High Speed Steel (HSS) TiN Coated 4-Flute Spiral Up-Cut Router Bit

    This one.
    Awesome ! Thanks!

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