[Jewelry making - Article 01620] - [Orchid] 12 Ton Bonny Doon Hydraulic Press

[Dar Shelton]

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    This is really great news about the new 12 ton "Lite" Bonny Doon
    press, and amusingly timed considering I wished for it the day before
    it was announced, and I had no idea it was even more than my fantasy. 


    There really did need to be something similar to fill the hole left
    by the original 20 ton BD, and though 12 tons isn't all that much in
    the realm of hydraulic presses, it is enough to get your feet wet
    with many of the processes done on bigger presses. It's definitely
    enough for blanking anything jewelry related, such as a bracelet 2"
    by 6" in say, 12 ga. silver. 

    As someone else posted, the press design in S. Kingsley's book is
    also perfect for this work, and I've seen it scaled up for use with a
    30 ton jack, using 1.5" threaded rod and 2" thick platens. 

    People considering building (or having built) presses similar to the
    BD design do need to observe minimum structural requirements and
    design attributes, such as welding the uprights inside the
    crossbeams, and definitely not welding the crossbeams onto the ends 
of
    the uprights. 

    My own history with presses goes from funky homemade things with hand
    jacks, before there was a Bonny Doon, to a 50 ton H-Frame shop press
    that lived a long life blanking parts. It used Enerpac's largest hand
    pump for a long time, then an air/oil motorized pump, and finally a
    1/2 hp Power Team pump. Now I use a small arbor press for breaking in
    dies that I make for people, 2 custom 20 ton BD frames that use Power
    Team 25 ton rams, and are powered by the old 1/2 hp pump, and a 1 hp
    Power Team pump, respectively . My big beastie is a BD 50 tonner that
    uses a 1.5hp Enerpac pump, $1000 courtesy of Ebay, that would go for
    $4,000 new now. I'm a little spoiled , though that's a small-potatos
    collection by industrial standards. 

Dar/Sheltech
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