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Thread: Aftershock ... rc glider

  1. #13
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    Default Re: Aftershock ... rc glider

    Quote Originally Posted by Arbo View Post
    Should be able to get started cutting wing molds in corian tomorrow. 3d models of cuts below.

    For alignment in all the parts, I drilled in with .25 bn mill, will use .25 ball bearings, set in on one side, and out on the other. That will be for all molds I make.

    Wings will just have them glued in on one side since that is mold instead of plug.
    I've literally just tried my first casting attempt with a corian mold minutes ago funny enough, the finish detail was excellent, no sanding just some wax release spray. Unfortunately was not enough to get the fiddly little parts to release and ended up smashing the corian to get them out. Maybe casting flexible PU in a solid mold was a little ambitious to ever believe i could reuse the mold but the parts came out great was toying with engineering wax before the corian but was no where near as good.



    Look forward to seeing your wing take shape.

    Attached Thumbnails Attached Thumbnails Aftershock ... rc glider-img_0150-1-jpg  


  2. #14
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    Default Re: Aftershock ... rc glider

    Long ago I found that a well sanded/polished mold from corian, did not need anything but a few coats of wax to release hard parts make with epoxy.

    Wood neophyte.


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    Quote Originally Posted by Arbo View Post
    Long ago I found that a well sanded/polished mold from corian, did not need anything but a few coats of wax to release hard parts make with epoxy.
    Interesting, thanks for the tip!



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    Default Re: Aftershock ... rc glider

    Looking at your parts, it might take a bit of thinking to get them to release, if they are in a recess as it appears they probably are. Personally I'd have some parts where the side wall was down to the base of the mold, and just fill or build a wall with clay, so you can stick something in there to pry them out a bit. if that makes sense.

    Wood neophyte.


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    Default Re: Aftershock ... rc glider

    Quote Originally Posted by Arbo View Post
    Looking at your parts, it might take a bit of thinking to get them to release, if they are in a recess as it appears they probably are. Personally I'd have some parts where the side wall was down to the base of the mold, and just fill or build a wall with clay, so you can stick something in there to pry them out a bit. if that makes sense.
    yes i think you are right that would help greatly.

    Have you by anychance tried using a ball nose cutter with a radius to reduce the accentuation marks between passes in corian, i get these alot too using single flute down cut and ball mill without a ridiculous amount of passes, thinking a radius cutter might help but without going up in flutes i would image that would mean using a straight single flute with radius. Not sure how well these work in corian.



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    Default Re: Aftershock ... rc glider

    Unfortunately all I have done is shorten the overstep. I am down to 10% on a .25" BN. I still get them and it requires a good bit of sanding (and the paper clogs constantly). But corian cuts like butter if you have the speed and rpm's set right. I am cutting out one of the wing molds now, it's about half done at 2.5 hrs with a .25 BN, and I did not rough at all, straight to a finish cut, and the 'deepest' part on the tips, is about .75", i slow down my machine for the first couple passes that are full deep, but then put it back to 100% speed.

    Wood neophyte.


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    Quote Originally Posted by Arbo View Post
    Unfortunately all I have done is shorten the overstep. I am down to 10% on a .25" BN. I still get them and it requires a good bit of sanding (and the paper clogs constantly). But corian cuts like butter if you have the speed and rpm's set right. I am cutting out one of the wing molds now, it's about half done at 2.5 hrs with a .25 BN, and I did not rough at all, straight to a finish cut, and the 'deepest' part on the tips, is about .75", i slow down my machine for the first couple passes that are full deep, but then put it back to 100% speed.
    Yeah it's lovely stuff to cut, Infact probably my favourite material. you can go fairly fast with slowish rpm for some nice big chips. If you have the time (maybe not worth the wait for big parts) I find 1 or two very small step overs and step downs and a repeat 0 pass makes for close to a fine grit finish. Visually notice the effect better using black corian, the repeat pass removes the last of the white'ish grey material left and polishes completely back to black.



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    Default Re: Aftershock ... rc glider

    I guess it depends on what the total machining time would be. This piece, about 62" x 7.5" (at the widest) just took a little over 5 hours. Loads of sanding to do.

    Attached Thumbnails Attached Thumbnails Aftershock ... rc glider-609e4540-4c1e-418f-ac05-2578a8e74327-jpg   Aftershock ... rc glider-4cb68f45-2e11-47ed-97e3-54ece70fb704-jpg  
    Wood neophyte.


  9. #21
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    Default Re: Aftershock ... rc glider

    Well I prepped up the tail plug with dam's around it. Mixed up epoxy and aluminum powder for a gel coat. Loaded it up. Once that get's a little hard, will add glass and such as backing to strengthen it.

    Attached Thumbnails Attached Thumbnails Aftershock ... rc glider-f0cdddd3-8a9c-4d8f-a133-87d59ff56361-jpg   Aftershock ... rc glider-634fea0a-a69e-445c-9f9e-fd888ac2005e-jpg  
    Wood neophyte.


  10. #22
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    Default Re: Aftershock ... rc glider

    I can't wait to see the end result. This is the main reason I started building my CNC. But it's smaller then your's so I can't build the wing that length. Keep up good work arbo.

    Sent from my SM-N900T using Tapatalk



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    Default Re: Aftershock ... rc glider

    Yeah, this is the reason I built my CNC, and after all these years, I am finally using it for that. lol. But you can do two piece wings, so no problem.

    Wood neophyte.


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    Default Re: Aftershock ... rc glider

    Popped it open just a bit ago. This is it just opened. Loads of clay to clean up and edges to sand down. Overall not bad for a first go at it.

    For the next one, which will be the other side of the mold, think I am gonna try to pour paraffin wax in the trough instead of clay, less cleanup I think. Also do a little better with the clay around the edges of the damn.

    Attached Thumbnails Attached Thumbnails Aftershock ... rc glider-58449cd7-d609-48d6-a1ce-53c5d3c3b4d0-jpg  
    Wood neophyte.


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