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Speeds and feeds

Discussion in 'Helpful Tools' started by Alex Chambers, Feb 3, 2019.

  1. Alex Chambers

    Alex Chambers Openbuilds Team
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    For those (like me) who cant multiply by 25.4 in their head I have modified the speeds and feeds chart from Carbide to include metric as well as imperial. It is in the form of an excel spreadsheet - if anyone wants it in another format please let me know.

    Alex

    PDF now attached
     

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    #1 Alex Chambers, Feb 3, 2019
    Last edited: Feb 3, 2019
    MiraZ, SpringBob, ljvb and 4 others like this.
  2. jeffmorris

    jeffmorris Veteran
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    PDF file format, please.
     
  3. Alex Chambers

    Alex Chambers Openbuilds Team
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    Done
     
    SpringBob, Colin Mccourt and GrayUK like this.
  4. Giarc

    Giarc Master
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    Thank you!
     
  5. Parag

    Parag New
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    I want to carve mdf, is the depth of cut 7 mm is suitable for workbee ??
     
  6. Alex Chambers

    Alex Chambers Openbuilds Team
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    I haven't been that brave yet - the table is for a 1/4" cutter. I usually use a 1/8" or 3mm cutter and my maximum depth of cut is about 3mm, so I suppose it sounds about right for 1/4". I would be inclined to experiment with different DOC's - if it sounds as though the cutter is being strained or you see signs of the cutter being pushed sideways you are going too far.The table also doesn't state how many flutes the cutter has. The DOC you can achieve also depends on how rigid your machine is - the more flex in your framework the less DOC you can manage. Having said that you should be aiming to cut chips rather than dust - too high spindle speed, low feed rate and low DOC means the cutter will be rubbing against the material instead of cutting = heat = blunt tool. The table is only a guide to get you started - experiment on scrap with different spindle speeds and feed rates and about half the DOC the table suggests until you feel the cutter is working efficiently and then increase the DOC until you see signs of strain - then back off a bit. The workbee is a pretty tough machine - I once stupidly hit a clamp on the bed and it ripped the 18mm mdf spoiler board apart. (I don't recommend trying this).
    Alex.:):thumbsup::nailbite:
     
  7. Giarc

    Giarc Master
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    By the way, I just cut acrylic with a 1/4 inch Onsrud O flute endmill with a Makita and those settings worked very well.
     

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