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moving the saddle forward

Discussion in 'BRIDGEPORT MACHINES INC. & B'PORT CLONES' started by 1mondo, Jun 25, 2017.

  1. 1mondo

    1mondo United States Iron Registered Member

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    Hi
    Well before I get into tearing the old girl apart "AGAIN" I thought I would check if anyone else has had this problem and what the solution was! The Y axis is where the problem is.
    Problem seems to be getting worse! When I crank the saddle back (TOWARD THE COLUMN) it cranks super easily, but when cranking forward (TOWARD THE OPERATOR) it takes all of my strength and both hands to bring the table forward!! The one shot oiler seems to be working fine. I'm wondering if the problem might be in the chip plates binding together. Any help would be appreciated!
    Thanks
    Ray
     
  2. Tom Howland

    Tom Howland United States Steel Registered Member

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    Check the gib. Maybe the adjusting screw is not set right or missing.
     
    Bob Korves and brino like this.
  3. DAT510

    DAT510 United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Tom's comment reminded me..... My Lathe has a "Push/Pull" gib on the cross-slide, with adjusting/lock screws on both ends. Once when the back screw got loose (or I likely I forgot to tighten), I notice something similar. Easy to move in, harder to move out.
     
  4. 1mondo

    1mondo United States Iron Registered Member

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    THANKS GUYS
    I haven't checked the gib yet but will get to that tomorrow! As for the push/pull gib I do not have that on my mill. I messed with it a bit today and found out that if I tighten/loosen the dial lock ring on the Y crank it makes a ton of difference and cranking becomes almost manageable. Maybe I have a lead screw split nut problem going on. When I got the mill I tore it down to bare bones and started over. I did buy new split nuts and installed them.Maybe the mill gremlin is in there messing with things??
    Thanks again
    Ray
     
  5. RJSakowski

    RJSakowski H-M Supporter - Premium Content H-M Supporter-Premium

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    When you crank in, the frictional force is pushing the lead screw out and add clearance at the thrust bearing. When you crank out, it pulls the lead screw in reducing clearance on the lead screw thrust bearing. You might want to take a close look at the thrust bearing and any mating parts. It is possible that you have some galling which is causing the binding.

    Also, when you tighten an adjustment nut, it is pushed to the outside of the thread. When you tighten the dial lock nut, it takes up any clearance in the thread, push the adjustment nut in and reducing clearance.
     
    4gsr and dlane like this.

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