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Bridgeport j head bolt circle

Discussion in 'BRIDGEPORT MACHINES INC. & B'PORT CLONES' started by seanb, May 22, 2017.

  1. seanb

    seanb United States Active Member Active Member

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    Can someone measure the bolt circle for the j head where it bolts onto the ram

    I am building an adapter to install a J head onto a round ram

    Also what type of steel should I make the adapter out of would A36 be strong enough
    I found a piece 1" thick 6" diameter
     
  2. Silverbullet

    Silverbullet Active Member Active Member

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    Should be tuff enough steel, same stuff they use for target gongs I think. If holds up being shot , should be good enough to hold a Bridgeport.
     
  3. expressline99

    expressline99 H-M Supporter - Premium Content H-M Supporter-Premium

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    Hey Sean mine is still removed from the ram. If I can figure out how to measure it I will do that for you.

    Paul
     
  4. expressline99

    expressline99 H-M Supporter - Premium Content H-M Supporter-Premium

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    I get 6-1/2" across outside edges of the bolt holes. Mind you this isn't using a caliper as mine didn't quite reach across. The bolts are about .490 in diameter. The bolt holes are .520 to .525

    Hopefully that helps a bit.

    Paul
     

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