MPCNC Speeds and Feeds Chart

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This topic contains 13 replies, has 3 voices, and was last updated by  Ryan 1 year, 5 months ago.

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #59085

    mulze32
    Participant

    Hey all. I’m in the process of ramping up my abilities to include cutting and I am wondering if we could build a reference chart for us noobs for our spindles that we have standardized on, Dewalt 660 and the Makita?. But maybe this chart could give us an idea of what we could look for, for various materials or does something like this already exist? My plan is to use Fusion 360 CAM eventually but even for Estlcam it would be nice to have a reference. I attached a link to a picture that they use for the Shapeoko 3 for a .25″ End and Ball Mill that could be of reference.

     

    http://docs.carbide3d.com/support/supportfiles/S3_feeds_250.jpg

    #59086

    Ryan
    Keymaster

    I would love it!

    We have tried before a bit. The difference is everyone builds there machines at drastically different sizes. Each size is different speeds and feeds. I have a break down of how I do it on the milling basics page.

    If you can make it work it would be awesome.

    #59092

    mulze32
    Participant

    So when you say each size is different speeds and feeds you mean the size of the bit? or the size of the machine? So if I was to build a machine larger than my 12″x12″ cutting area machine I would need to have slower speeds and feeds?

    I’m happy to record my notes but if others would like to chime in on theirs as well that would be great because I understand that its a really important thing to get right to get the right chips off of the material, not ruin the bits, and get the desired cuts.

    #59094

    Ryan
    Keymaster

    So if I was to build a machine larger than my 12″x12″ cutting area machine I would need to have slower speeds and feeds?

    Exactly, and a 3″ Z vs a 4″ Z as well. there are 4’x4′ builds and 10″ x 10″ builds some with 18″ Z axis. If I say I cut something at a certain speed I get emails about how there machine can’t do that…with a “small 6” Z axis. So many variables, it makes it tough.

    #59095

    Ryan
    Keymaster

    Then throw slotting vs adaptive/peel/tricoidal in the same material…

    #59101

    mulze32
    Participant

    Yikes.. but I would assume that is the basic problem for the Shapeoko and the X-Carve too the only difference being that they can standardize on three different build sizes.

    So in my opinion I guess the table would look like what it takes to cut various materials on my size of machine and then others can use it as a reference point.

    #59104

    Ryan
    Keymaster

    Yes.

    The shapeoko chart should be a good match as well. Same thing, see how those numbers translate to your machine and adapt. They aren’t as different as people think.

    #59116

    mulze32
    Participant

    Awesome! Well will be interesting to see what I can come up with.

    #59222

    mulze32
    Participant

    Ryan,

    Quick question. How often do you adjust the speed on your Dewalt 660? I’m looking at cutting ABS and according to the Carbide Speeds and Feeds chart for a .25″ end mill it wants the router operating at about 17k RPM  and then DOC at .07″ and feed rate at 65 mm/s (I assume) when the 660 does 30k at FLA. I’m going to plan on using your values in the Milling Basics tab but wondering if I should adjust the 660s output to maybe half FLA?

    #59223

    Ryan
    Keymaster

    Lots of things in that post.

    First, speed. https://www.v1engineering.com/speed-control/

    Now, I would not use a .25″, best to learn with a 1/8″. Even better is a single flute 1/8″. You should never ever try to make a cut at 65mm/s on an MPCNC. 30 max, I use 8-15. Whatever chart you are looking at must be for a giant mill.

    #59225

    mulze32
    Participant

    I was looking at the graph that they posted in the Carbide link.

    But I found  a new link below and it now translates to 27.5 mm/s.

    https://www.shapeoko.com/wiki/index.php/Materials#ABS

     

    But with that said I will do the 1/8″ single flute end mill with a 8-15 mm/s feed rate.

    But would it also make sense to turn down the 660 to prevent melting of material with the bit? I have made one of the DIY speed controls ready to rumble.

    #59227

    Ryan
    Keymaster

    Plastics are not that hard to mill, they just have a much smaller sweet spot than wood. I 100% recommend a speed control. The important part with plastic is getting the chips out of there to prevent re-cutting and melting so a single flute makes that much easier.

    1 user thanked author for this post.
    #59228

    woodknack
    Participant

    Lots of things in that post.

    First, speed. https://www.v1engineering.com/speed-control/

    Now, I would not use a .25″, best to learn with a 1/8″. Even better is a single flute 1/8″. You should never ever try to make a cut at 65mm/s on an MPCNC. 30 max, I use 8-15. Whatever chart you are looking at must be for a giant mill.

    I cut a 2″ circle in 3/8 pine with a 1/4″ 60 degree bit at 60mm/s in one swipe! I didn’t have my speed set right or the number of cuts. Newbie mistake. But the dam think chugged right through it with out missing a step! Surprising..

    #59230

    Ryan
    Keymaster

    I can imagine standing there hand hovering on the emergency stop….stunned at how it just kept going! I have done some similar stuff.

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