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CNC cutter egly edges in ACP

Discussion in 'CNC Routers & Engravers' started by 0igo, Apr 18, 2018.

  1. 0igo

    0igo Active Member

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    Just got a new bit and thought it would help but actually made it worse. Anyone what I'm doing wrong? I'm moving at 1200mmps and got my spindle spinning at 1500rps. Any advice on this?

    Both sides came out ugly :(
     

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  2. Christian @ 2CT Media

    Christian @ 2CT Media Major Contributor

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    You are running at 90K RPM? thats way too fast! Also 2800 inches per minute is way too fast of motion.

    We cut ACP with our .5hp spindle at 100 Feet per minute with a spindle rotation of 28K RPM using a single o-flute upcut 1/8" CED
     
  3. 0igo

    0igo Active Member

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    Well my program to run the machine is in metric and maybe I'm not converting it right? I'll post pics of what my settings are
     
  4. 0igo

    0igo Active Member

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    Also my program overrides spindle speed. So it's set at 1500
     

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  5. GaSouthpaw

    GaSouthpaw Active Member

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    Are you 100% certain that your spindle is overridden to 15K? Because that's the only thing I can think of that might be causing it. Every other speed seems like it should be fine- but that 6250 RPM on that one program is far too low, in my opinion. I tend to run the spindle at near max to get the speed and good finished edges.
     
  6. henryz

    henryz Member

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    First see if you can change your setting on the program you are using and GaSouthpaw is right, we typically run at 18000 rpm and 60-100 inches / min. speed. The bit you are using might be an issue too if it's too cheap it wont cut clean. We only use Belin / Onsrud.
     
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  7. Christian @ 2CT Media

    Christian @ 2CT Media Major Contributor

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    how many passes are you doing? 4? That also doesn't help with ACP 1 pass is all we do, 2 if we need really clean cut
     
  8. fuzzy_cam

    fuzzy_cam The Granbury Wrap & Sign Guy

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    Looks like your using a .25" bit, wrong kind too. We use a 1/8" straight flute end mil. Not sure what your speed settings are. We cut around 3.5 inches per second @ 16,000 rpm. Perfect clean cuts all the time. upload_2018-4-19_8-13-34.png
     

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  9. Martin Denton

    Martin Denton Member

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    Manchester, UK
    We being UK based work in metric. We run at 20,000 RPM with cutting speed of 20 - 30 mm per second in climb direction using 5 - 5mm 2 flute carbon tools. We cut just fine unless we are using a really cheap acm and then it can get ragged, but on .3mm skin it cuts beautifully
     
  10. bowtievega

    bowtievega Member

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    We typically cut ACM at 18000 rpm at about 100 ipm with a 1/4” single ‘O’ flute up cut bit from Onsrud. If they are small pieces and we want to make sure they don’t move it if we are cutting printed sheets if acm we use a down cut single ‘O’ flute. Absolutely perfect edges. We have a 5’x10’ Multicam with 11hp spindle.
     
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  11. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    Agreed, looks like the wrong bit. Spiral O flute upcut bit for ACM.
     
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  12. JBurton

    JBurton Signtologist

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    Looking at the pictures of the g-code, I'm fairly certain the g-code command for M3 is in rpm, not rps.
    I'd recommend changing g-code to:
    M03 S18000 (this is rev per minute)
    G01F1500 (this is mm per minute)
    If you mean to say your spindle speed is not set by your program, crank it up manually to something like 18,000 rpm.
     
  13. JBurton

    JBurton Signtologist

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    Also cut through the material in one pass...
     
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  14. Sandman

    Sandman Member

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    Absolutely the wrong bit. Single O flute up cut bit gives the best result. I will only use Onsrud 65-000 series or my favorite is the Belin 33000 series. Same geometry but the Belin bit's polished backside has tighter ripples and I feel it gives me a slightly better cut. Wensco Sign supply in Grand Rapids Michigan stocks the Belin if you can't find a closer source. This is a "g" I cut at 12,000 rpm and 150 inches per minute (63 mm per second, or 3810 mm per minute) which gives me a very clean cut and good chips. This "g" is straight off the router and this was with the same bit that I've used for over 4 years.
    G.png
     
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  15. JBurton

    JBurton Signtologist

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    This guy gets it! You may baulk at the cost, but they are well worth it!
     
  16. X Edge Tools

    X Edge Tools New Member

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    Jan 25, 2018
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    I used to use the Belin 33000 for years. It did a fine job but then I went to work for X-Edge products and our tools are far superior to anything I have every used in my 25 years in the field. For ACM use the Viper Series XV2230 or XV2232 and run 150 ipm @ 20,000 rpm. Absolutely beautiful. Our Razor series for Sintra, UHMW, HDPE etc. is amazing too. Cutting 1/2" sintra at 1,000 ipm single pass with a 50k rpm spindle! "O" series for the best acrylic edges you have ever seen. Sorry I get a bit excited some times but everything I am saying is true. You can check out the Viper series for the ACM here. CNC router bits & accessories by X Edge eXtreme Speed eXtreme Quality .
     
  17. Christian @ 2CT Media

    Christian @ 2CT Media Major Contributor

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    Whats funny about all this talk of bits, for our machine we have run belin, onsrud, amana, and a few others and the bits that last the longest and cut the best are $1.72 bits from china.
     
  18. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    The best snap blades I've ever used for an Olfa were some cheapo blades from China.
     
  19. Sandman

    Sandman Member

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    No doubt China makes some quality products. The problem is they usually aren't branded so you can't tell what's good and what's not until you try them. With that said, the difference in price is not life changing and I'll buy American made when I can. It's getting harder all the time. China is going to own us someday.
     
  20. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    That and the amazing blades you used once might be total crap the next time you order them.
     
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