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Thread: Leverage.

  1. #1
    Boolit Master
    Join Date
    Nov 2017
    Location
    brisbane ,qld,australia
    Posts
    2,125

    Leverage.

    On an O frame type press,where is the best place to pivot the swing links.I used to think the pivot should be on the centreline of the ram,but now I think the pivot should be on the operator/ lever side,so that side load on the ram is reduced near overcentre position.This position also allows a single long pin thru the frame to be used.

  2. #2
    Moderator

    W.R.Buchanan's Avatar
    Join Date
    Mar 2011
    Location
    Ojai CA
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    9,872
    Just look at the compound linkages on RCBS or Redding presses. That should answer your question.

    Randy
    "It's not how well you do what you know how to do,,,It's how well you do what you DON'T know how to do!"
    www.buchananprecisionmachine.com

  3. #3
    Boolit Master
    Join Date
    Mar 2005
    Posts
    4,612
    On the center line at the very top of the frame.
    Of course the links would be in your way.
    By pinning the links to the top of the frame like the Redding Ultra Mag only the top of the frame has any real stress on it.
    Some times design theory and ergonomics have to reach a compromise though.
    EDG

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check