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Type: Posts; User: Decieved

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  1. Replies
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    Am i getting too fat?

    Building a gantry mill and been mulling over my moving gantry. Its based on steel tubes and im going to fill it for dampening etc

    Bare gantry is about 50kg fully filled it adds about 110kg, i can...
  2. Re: Rotating ballnut/ballscrew mounting question

    I was unsure about the holding power of a clamp and the tapped end to come undone, probably that way its attached above.

    I will give the clamp a try. Thanks

    Skickat från min M2101K7BNY via...
  3. Rotating ballnut/ballscrew mounting question

    Hello all.

    Im building a new machine thats gonna use rotating ballnuts and fixed screw.
    I have got the ballnut sorted but im not sure how to fix the screw to my machine. Have been looking at...
  4. Re: Comparison between uhpc and epoxy granite mixed?

    Concrete as in building stuff with portland cement?

    Regular concrete takes years to cure if ever and it moves and drinks water making it a bad choice for machine bases. That being said im building...
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    Re: Vibrator for epoxy granite

    Yeah the ignore it route is where im heading im not seeing the stated amount of air in my castings. Gonna vibrate it with what i have on hand and be done with it.

    I have a 200mm deep testpiece...
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    Re: Vibrator for epoxy granite

    Thank you, is there something in particular you are thinking of? I usually make molds out of melamine board it realeases well but might try phenolic sheet for bigger molds if i can get a flat sheet....
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    Re: Vibrator for epoxy granite

    Real test piece, a few pinpricks doesnt feel worth worrying about.


    https://www.cnczone.com/forums/attachment.php?attachmentid=468740&stc=1
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    Re: Vibrator for epoxy granite

    Yesterday i had time for some testing using what equipment i had. I tried vibrating a small sample, packs nicely but some air. Degassing using vacuumchamber works nicely.

    In a 1L batch there was...
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    Re: Vibrator for epoxy granite

    Ok i have only seen premixing and vibrating done.

    My old recipe used 12% epoxy by weight and the new one i want to try ~8% aint the remainder the solid ratio?

    I havent measured any of my...
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    Re: Vibrator for epoxy granite

    The water fill test you speak of i have already done, its how i find my mixes. How do commercial casters avoid or get rid of porosity?

    Still a bit to cold around here to make samples but in a few...
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    Re: Vibrator for epoxy granite

    Thats some segregation.

    I have used crushed rock and quartz earlier ranging from 1-8mm in size <12% epoxy by weight. Yielded good castings but was long ago so i cant really remember if or how much...
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    Re: Vibrator for epoxy granite

    Hm just to be sure i understand, you use one size aggregate like 5mm and the rest is epoxy ~30% ?
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    Re: Vibrator for epoxy granite

    Great thanks will do a test. When packing dry dont you find it that the mix separates? And have air bubbles get stuck to walls when not vibrating? thats mostly cosmetic tho.
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    Re: Vibrator for epoxy granite

    Yeah but we are talking weeks of curing time. I was happy when i found this epoxy because it has a pot life of 16hours way more then what i have used before. I havent decided wether im going to post...
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    Re: Vibrator for epoxy granite

    Oh my dident know that, that would be great. I have a new supplier of epoxy and its actually a product for rivertables but i doubt it is thin enough to dry pack, its viscosity is 295 mPa.s. They had...
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    Vibrator for epoxy granite

    Hello all

    Putting together tools and workspace to build using epoxy granite and was wondering whats needed to vibrate bigger molds?

    I have a few pneumatic vibrators of different size that i...
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    Good design CNC router

    Hello all

    I want to eventually upgrade my home machinepark, that means cnc router, cnc lathe, and cnc mill. This thread is a search for a design to replace my current cnc router.

    What i have...
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