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Thread: Check out my 2nd cnc

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    Default Check out my 2nd cnc

    A bit of details:


    Couple of cuts:




    The whole thing took 4 and a half months. The 1st cnc...8 months.
    See that one too:
    Pololu robotics forum - View topic - CNC prototype

    Word to beginers: do not give up.

    Similar Threads:


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    Very nice. It seems to machine Al just fine for most uses.

    I particularly like the raised side rail design - that makes for a very rigid upright vs the risk of wobbly uprights on a moving gantry.

    Is there a reason that you had to make your own circuit board to pull it off - that is a leap of faith for me.

    It looks like there was some cutting fluid being dispensed, was that you or does your machine spray some before the cut ?

    Congrats.

    Harry



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    Thanks harryn.
    I'm glad you noticed the top and bottom support on the gantry. It makes it so much more rigid than just bottom support. Down side is that you need 2 motors on Y.
    It took me about one and a half months just for r&d. A lot of good info can be found here:
    Do it yourself CNC router: Design Considerations, the Gantry

    As far as making the electronics I only made (designed) the motherboard. The drivers are from pololu. I wanted to design a PCB for a long time so this was the perfect ocassion/challenge. Not to mention way cheaper than what you can buy. I would guess about $130 in electronics and $80 for the motors. Imo it's great price for 4 stepper motor setup.

    Using pro tap cutting fluid. I sprayed it before starting the cut.
    I wish I used it last night . Serious chip welding. I wanna post that on youtube as well, for a learning lesson.

    Working on a flood system after the one I got from MicroMark didn't event start. Went ahead with the cut and I payed for it.



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    bg_blea,

    In those videos with all those aluminum shavings....don't they get into the lead screws and bearings and jam stuff?

    newpatch



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    The only spot where it might be a problem is the the bottom of the z axis. There is a retaining ring that hopefully does the job untill I come up with smth better. Like a flood system or vacuum.

    Other than that screws and bearings are clean.



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    hey bg_blea, very nice job you did and pretty original, congrats

    What kind bit you are using to cut the aluminum in your videos and at what speeds?

    I never cut aluminum with my CNC but I plan to do so in the near future and somehow I thought the speed you are using is too fast

    Nicolas


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    Thank kolias.
    One of the vids has the details:
    3 flute carbide, 1HP Bosch Colt, 16K RPM, 48 cut IPM, 10.5 plunge IPM , 1/32" DOC.

    The end mills are from McMaster made by Niagara. If you;re running a router I suggest you look into a collet like the ones from precise bits. Here's a reseller Router Accessories - Collets for Porter Cable and Bosch Routers

    Why do you think it's cutting to fast?
    Theoretically 48IPM/ 16K RPM * 3 flutes = .001" chip load.
    Practically chipload (kindda hard to measure it) is about .006".

    I plan on running at 1/16 DOC (I did that at 48 IPM and it works just fine) and increase the feedrate and the rpms. Router will do 35K RPM so... 105IPM.. wow. Hope it can make it.

    Before all that I'm working on a flood system maybe a week or so.
    3 more vids coming up.



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    Thanks for the info and the link

    I have no experience cutting aluminum and it looked like too fast for me. Glad itís working out for you.

    Regarding the 3 flute carbide, some time ago I read that cutting aluminum is best done with 1 flute so when the times comes I will give a try with both and find out the results

    Good luck with your flood system

    Nicolas


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    I don't have much experience at all either .
    One thing I red online was that 3 flutes is a magic number to avoid chatter.
    Smth to do with resonant frequency of Al. The guy has a Phd. Lol.
    I ran 2 flutes as well and it worked great.
    From what I get the less flutes the better chip evacuation the more flutes the better the finish.



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    Makes sense in what you are saying about less / more flutes

    Guess when the time comes I will order 1, 2 and 3 flutes and then I will know exactly which one does the best job.

    Nicolas


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    Default flood cooling



    Still work to be done but it works.



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    Nice job bg, you are heading the right way

    Nicolas


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