. .
  1. #1
    Hi.

    I am cutting furniture out of 12mm MDF using Straight 6mm 2 flute carbide bits.

    I usually take 4 passes (3mm each). The bits last on average about 80 mins before sounding 'wrong' and emitting burning smell.


    Is this about right? or should they last longer. I have tried various ones from UK and from China, but they are all about the same.


    Just wanted to know if this sounded normal, or wildly out.

  2. #2
    If it's burning, then RPM is too high, or feedrate is too low. Either causes excess heat, which dulls tools faster.
    I'd make 2 passes at 6mm per pass, too.
    Gerry
    ______________________________________________
    UCCNC 2022 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

  3. The Following User Says Thank You to Ger21 For This Useful Post:


  4. #3
    Thanks Gerry.

    But when I touch the blade after it has stopped. Its not even slightly warm. I only smell a slight burning when it has got near the 80 mins use.

    The ones from China are about £3 each, so maybe that isn't so bad?

    btw, the spiindle is running at 23,000rpm. I was advised by the manufactured of the CNC machine to go that speed for MDF.
    Last edited by Millatime16; 14-07-2018 at 08:11 PM.

  5. #4
    What feedrate are you using? I cut 12 meters/min at 17,000 rpm. 23,000 is likely way too high.
    Gerry
    ______________________________________________
    UCCNC 2022 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

  6. #5
    I will check tomorrow. The manufacture set it all up. Is it shown in the MACH 3 software?

    (The RPM is set on the Kress spindle itself).

  7. #6
    Clive S's Avatar
    Lives in Marple Stockport, United Kingdom. Last Activity: 23 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,333. Received thanks 618 times, giving thanks to others 78 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Quote Originally Posted by Millatime16 View Post
    Hi.

    I am cutting furniture out of 12mm MDF using Straight 6mm 2 flute carbide bits.

    I usually take 4 passes (3mm each). The bits last on average about 80 mins before sounding 'wrong' and emitting burning smell.


    Is this about right? or should they last longer. I have tried various ones from UK and from China, but they are all about the same.


    Just wanted to know if this sounded normal, or wildly out.
    What is the power of your spindle and what feeds and speed are you using. I have been cutting 9mm mdf with a 3mm alibond on top and using a single flute 4mm carbide with 6.5mm doc and about 3.5 mtr/min without any problems spindle speed 2200rpm 2.2 kW I think we did about 15 8x4 sheet with many profiles within in one day

    Edit these are the bits :- https://www.ebay.co.uk/itm/4mm-SOLID...1e30%7Ciid%3A1
    Last edited by Clive S; 15-07-2018 at 07:59 AM.
    ..Clive
    The more you know, The better you know, How little you know

  8. #7
    Its a Kress 1050.

    Where do I find the feed rate etc? I only know the basics of MACH 3 so far. (Its an A1 machine).

  9. #8
    Spiral bits are generally better for CNC use, as they evacuate the chip (upcut bits) and surface edge finish can be superior.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Tool Life Expectations?
    By Washout in forum Tool & Tooling Technology
    Replies: 18
    Last Post: 06-01-2014, 01:49 PM
  2. SWAP: 6mm Carbide CNC Router Bits for 3mm's
    By Fivetide in forum Items For Swap
    Replies: 8
    Last Post: 04-12-2012, 04:47 PM
  3. Cutting bits nomenclature - help requested
    By DanielF in forum Tool & Tooling Technology
    Replies: 2
    Last Post: 12-05-2012, 04:53 PM
  4. How would I go about making a jig to grind carbide V cutter/engraving bits?
    By HankMcSpank in forum Tool & Tooling Technology
    Replies: 2
    Last Post: 12-03-2012, 12:39 AM
  5. why is nothing in life simple!
    By ptjw7uk in forum General Discussion
    Replies: 7
    Last Post: 08-07-2009, 09:21 PM

Bookmarks

Posting Permissions

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