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Speeds and feeds

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

  1. Alex Chambers

    Alex Chambers Master
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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
     

    Attached Files:

    #1 Alex Chambers, Feb 3, 2019
    Last edited: Feb 3, 2019
    sharmstr, MiraZ, SpringBob and 5 others like this.
  2. jeffmorris

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

    Alex Chambers Master
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    Done
     
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  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 Master
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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.
     
  8. Heba

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    Hi Alex,

    Thanks for the sheet it'll make my life easier to start testing materials. One question though - DOC stands for....? and 'feed' is your cutting feedrate/min?

    Also regarding plastics, I'm finding HIPS extremely difficult to cut (melts, foams, and wherever it cuts foam reforms behind to mess up the cut. I rarely get a neat cut, plastic sticks to drill bit and hardens while working).

    I know you use Fusion 360 so was wondering if you also play with conventional vs climb rotation. I've already realised a single flute is the best, and multiple depth of big max 2mm per pass so that's a start....(if your experience says otherwise let me know!)! Do you have an other tips for plastics in general and especially HIPS?

    For sure I need to invest in some blower/cooling system.

    Thanks!

    Heba
     
  9. Alex Chambers

    Alex Chambers Master
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    DOC = depth of cut. I have a Makita (Chinese clone) so use slowest speed (10,000 rpm) for HIPS and would go slower if I could. Feed is feedrate / min. I can't remember what that table recommended for HIPS - I use the fastest I can (about 2,000 mm/min) I have been using a 4 flute upcutter 3mm end mill with some success, I did use 20 degree single flute engraving bits but found melting was a problem. Cooling fan sounds like a good idea.
    For softer materials I prefer to use conventional milling.
    Alex. :thumbsup:
     
  10. Alex Chambers

    Alex Chambers Master
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    PS - my experience with cnc routers is measured in months, not years - do post your own results here.
    :):)
     
  11. Heba

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    I will take good notes for my next tests and will try with both one flute and four flute (would never have thought of using a four flute!!) and post my results here foe sure. Thanks again for your help!
     
  12. sharmstr

    sharmstr Master
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    There's no WOC values?
     
  13. Alex Chambers

    Alex Chambers Master
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    I just did the imperial/metric conversion sums on the chart from carbide which was for a 1/4" bit, but I don't think it even said what sort of bit.
    Alex.
     
  14. sharmstr

    sharmstr Master
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    So, do you think its based on full woc? I've only been cutting plywood and plastic. I want to cut out some walnut this weekend using adaptive so WOC is important.
     
  15. Alex Chambers

    Alex Chambers Master
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    Can't answer that @sharmstr, but from my experience of machining mahogany (which they give figures for) I would say that the term "mahogany" covers a wide range of species and some very different properties so that table can only be regarded as a rough guide.
    Alex.
    PS the original chart is here;
    Materials Speeds and Feeds Chart
     
  16. Giarc

    Giarc Master
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    For hard woods, I like to use a two straight flute endmill to prevent tear out. I have had good luck in oak cutting depth of 1/2 the diameter at 2500 mm per minute. Here is an 1/8 inch bit that I use with both woods and plastics. I always ramp in to the material with these bits. https://www.amazon.com/Straight-EnP...e&qid=1561738653&s=gateway&sr=8-2-spons&psc=1

    I have a 1/4 Freud 2 flute similar to the one in the link that I love. The one in the link I own as well and love it.

    Also, I use a dust collector when using these bits and it clears the chips out well.
     
  17. sharmstr

    sharmstr Master
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    Excellent. Do you use the same f&s for the 1/4" bit?
     
  18. Alex Chambers

    Alex Chambers Master
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    I haven't worked American (black) walnut and only used hand tools on European walnut although I believe they are very similar to work. How they behave depends on the grain - straight grain little problem - figured grain tearout can be a problem.
    I found this link if it's any help.

    Wood Species Guide

    Alex.
    PS wear a dust mask.
     
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  19. Alex Chambers

    Alex Chambers Master
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    Regarding the cooling fan, I tend to have a vac nozzle really close to the bit - sucking cold air past it - same effect.
    Alex. :cool:
     
  20. Giarc

    Giarc Master
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    Sorry I missed this. I have been on vacation in areas with limited cell phone reception and no wifi. I highly recommend it.:) I have been using the same speeds an feeds just deeper cuts (1/2 diameter) with the 1/4 inch.
     
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  21. sharmstr

    sharmstr Master
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    No problem. I've already cut a bunch of walnut with it. Way better than my 3FL spiral I was using.
     

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