Results 1 to 2 of 2

Thread: Tear out in Ultraboard Foam Core

  1. #1
    Join Date
    Aug 2011
    Oakland, Ca

    Default Tear out in Ultraboard Foam Core

    I am having problems with tear out of the core of 1" Ultra Board. (Foam Core with PVC Skins). The manufacture recommends a spiral bit cutting at 2in per second at 18000 RMP. We still get tear out. We are using a onsrud 52-564 1/4" spiral bit. Any recommendations? Thank you in advance.

  2. #2
    Join Date
    Jan 2004
    iBILD Solutions - Southern NJ


    I don't know if you need a 1/4" tool or if you can go larger. It looks like the right tool for the job is either a 2 or 3 flute spiral-O, but it doesn't look like Onsrud offers it in a length of cut (in 1/4" dia) long enough to get all the way through your material. Those grinds would be 52-624 or 60-241, respectively.

    Harvey, who makes premium tools, has a similar grind in 1.25 or 2.00 length of cut, in 1/4" dia, part numbers, respectively: 986516 or 992416

    I get mine from Mike @
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training

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