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+6
Gnome
amir
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Hermit
fiddler49
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    Brass Tube and epoxy putty roller nut

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    fiddler49
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    Brass Tube and epoxy putty roller nut - Page 2 Empty Brass Tube and epoxy putty roller nut

    Post by fiddler49 Mon Jan 05, 2015 7:54 pm

    First topic message reminder :

    I just took a piece of 1 1/2 inch brass sink drain tubing, 17 gauge, and cut off a short 1 1/2 inch wide piece with a tubing cutter, then drilled two holes a 1/4 inch wide where the claws would be through both sides of tubing. I then cut 2 short pieces of 1 /4 inch mild steel rod and put them threw the holes as reenforcement for the claws. I also drilled one more hole opposite the claws for a hardened piece of allen wrench. I then took 2/3 rds of a tube of epoxy putty and filled in the center of the brass tube. I pushed the short piece of allen wrench into the bottom hole so the flat side will eventually face the tickler. I'll finish cutting out the claws and ticker slot next week. I'll test out this nut in my 600 lb cross bow that at the moment has a nice moose roller nut and let you guys know how it works. The brass tubbing is exactly 1 1/2 out side dia. This method is very easy to do and could use a liquid epoxy or acryillic as a filler. I'll post pics soon. cheers fiddler49


    Last edited by fiddler49 on Mon Jan 05, 2015 7:59 pm; edited 1 time in total (Reason for editing : added to title)
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    Brass Tube and epoxy putty roller nut - Page 2 Empty Re: Brass Tube and epoxy putty roller nut

    Post by Hermit Sat Jan 10, 2015 8:32 am

    why not make a nut entirely from epoxy putty?,my take on that Amir,is that it is unsuitable.
    It doesn't have the necessary strength or wear restistance.There are readily available far better alternatives.
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    Post by Wargasm Mon Jan 12, 2015 7:40 pm

    y'all know you can order brass and bronze solid bar online right, easy to shape with a file, if a bit time consuming, and I think it would look pretty period correct.

    http://www.onlinemetals.com/merchant.cfm?pid=7827&step=4&showunits=inches&id=301&top_cat=850
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    Brass Tube and epoxy putty roller nut - Page 2 Empty Re: Brass Tube and epoxy putty roller nut

    Post by hullutiedemies Tue Jan 13, 2015 9:55 am

    Gnome wrote:
    I would want to cut and file and sand the finished piece as little as possible, leaving all the embedded fibers intact to provide the greatest possible strength. Perhaps some kind of press mold would work? The mold would need to be as close to the final shape as possible.

    Based on experience, I would recomment exactly opposite approach.
    Especially if only one nut is needed it is much easier to get good quality cast if one just concentrates making a flawless cylinder of solid plastic. Thin extensions like claws are where air bubbles happen.
    Making the mold is easier- only a piece of suitable tube is needed. And no lathe is recuired.

    And shaping claws and sear fittings to correct measurements with hacksaw and files is easier afterwards, when the nut can be fitted to the lock.


    Direction of reinforcing fiber is not important as strain is shearing and compressing rather than bending. Quality of the resin casting is more important than fiber orientation.

    Fine fiber lint - cotton or flax is healthier and nicer to use than fiberglass- can be mixed to clay like epoxy putty by spreading and folding it a few dozen times.

    The plastic resin used should have good compression strength and wear resistance.

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