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  1. #1
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    Bumblebee 300x300x150mm

    Good day. I'm new on this forum and this is my first post. I have one aluminum cnc but its not so rigid as i need, so i start to learn how to made more rigid frame for cnc.
    i was choosing between cast iron and epoxy granite, and choose EG because: 1 damping properties; 2 i can made it by myself. So i start to read themes and articles about EG about fillers and resin, start making test mixes and after about 2 month was born first 2 parts of my new mill.
    as filler i was use quartzite and gravel and quartz sand 0.1 to 5mm (0.1-0.3 600 grams; 1-3 2000 grams; 3-5 - 2400 grams for 900 grams of epoxy). so what can i say - it was easy - i made mold with steel cores, mix and fill this mold) after curing and aftercuring all was milled grinded and assembled. I am really satisfied with result. and of course - some photos and videos attached. And sorry about my terrible English.

  2. #2
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    Re: Bumblebee 300x300x150mm

    and firs cuting https://youtu.be/SwM7TX6gLLk

    - - - Updated - - -

    and firs cuting https://youtu.be/SwM7TX6gLLk
    Attached Thumbnails Attached Thumbnails IMG_20171109_135002.jpg  

  3. #3
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    Re: Bumblebee 300x300x150mm

    Outstanding! Did you vibrate the pour/how?
    What machining did you do to the steel mounting surfaces?

  4. #4
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    Quote Originally Posted by rocketflier View Post
    Outstanding! Did you vibrate the pour/how?
    What machining did you do to the steel mounting surfaces?
    Thank you. After curing, all surfaces was milled on big milling machine and finishied with a surface grinding machine. I didn't use vibration, just dump it with big steel cube. And some photos of process....
    Attached Thumbnails Attached Thumbnails 0-02-04-3894dff05b9ac34a8ea7f2078f8b6240c9f580288b1860ed7a29ad243d25fbc2_full.jpg   0-02-04-4998449e6a9a6bc11751bcd3ef8fdd3545c4e6932fa8b35c9b0b23a494b34c88_full.jpg   0-02-04-c5af9e02a5be44d711a1b570465e29569ca13c1f237d137af39d88213ff0c430_full.jpg   0-02-05-23fb181014ca5adc4800f01d2a1a80f5f819c4b26b24fa765458d3d16e0950ba_full.jpg   0-02-05-87c5eea094f7095283f3e97b2f76c31f2945549bb18c2ca28220383b3008ef11_full.jpg  

    0-02-05-4437d4fe2c304021126616ce175c4b5ee48db495252e9ab47a44b581d143775c_full.jpg  

  5. #5
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    Re: Bumblebee 300x300x150mm

    Nice Work!

    I'd like to see what it can do with a half inch bit and a much larger piece of aluminum to really push it to it's limits.

    Well done.

  6. #6
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    Re: Bumblebee 300x300x150mm

    Spindle.. This one cant made this. i have plane to buy something more powerful and not Chinese, but this one can cover 90% of my tasks.

  7. #7
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    Re: Bumblebee 300x300x150mm

    Quote Originally Posted by smlua View Post
    Spindle.. This one cant made this. i have plane to buy something more powerful and not Chinese, but this one can cover 90% of my tasks.
    http://www.cnczone.com/forums/open-s...y-granite.html

  8. #8
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    Thanks. Im was thinking about belt driven spindle.

  9. #9
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    Re: Bumblebee 300x300x150mm

    Hi. and little video - trying 5$ endmill from local grinding shop https://youtu.be/grtFrsHFmGU

  10. #10
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    Re: Bumblebee 300x300x150mm

    She's a beauty! Awesome job. How did you put the design together?

    Is there any particular reason why you didn't use a colored gel coat on the mould before filling it with granite? You'd have gotten a smoother finish and could have avoided painting it later. Gel coat is a layer of thin epoxy painted on the mould and allowed to set up to tackiness before the rest of the composite is layed up. It is often pigmented to achieve a desired color.

  11. #11
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    Quote Originally Posted by genixia View Post
    She's a beauty! Awesome job. How did you put the design together?

    Is there any particular reason why you didn't use a colored gel coat on the mould before filling it with granite? You'd have gotten a smoother finish and could have avoided painting it later. Gel coat is a layer of thin epoxy painted on the mould and allowed to set up to tackiness before the rest of the composite is layed up. It is often pigmented to achieve a desired color.
    Thank you. Epoxy stick with a mold. I use pva for mold but it was to hard to release it. Now his driving with DMM servos and i realise i need more powerfull lpindle.
    https://youtu.be/nerzGKtdOaU

  12. #12
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    Re: Bumblebee 300x300x150mm

    looks great!
    i like the paint job. you have to show some parts you have cut on it.

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