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Tramming aid for my Bridgeport.

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  • Tramming aid for my Bridgeport.

    Last weekends project, a few months ago I purchased a shaper, since my shop is best described
    as 10 pounds of **** in a 5 pound bag, thing needed to get moved to make room for my third
    machine tool. The mill got turned on a 45 something that I should have done from day one, but
    that was over a decade ago and I had not accumulated much of what I have now... who knew...
    Moving the BP required me to move the head over to the side for the engine hoist to be able to
    lift it. So now it needs to be trammed in again. Anyway, I had seen people make a nice tram-
    ming tool from used brake discs and so I did the same. New ones from eztram are $2-300 more
    than I want to spend.

    Donor disc.


    Parting off hub.



  • #2
    Roughing and finishing first side.


    Trueing up the faceplate.


    Turning second side.


    Finished.


    Less than 0.0002 run out per side.
    More accurate than my old BP

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    • #3
      I found that a large bearing cup (10.250" OD in this case) requires much less preparation.
      Ignore the mill table, it was already fixt up when I got the mill.




      Rex
      Last edited by rode2rouen; 06-05-2013, 12:42 AM. Reason: speelage

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      • #4
        Originally posted by rode2rouen View Post
        I found that a large bearing cup (11.750" OD in this case) requires much less preparation.
        Sweet, like 12 inch bearing races are just laying around everywhere...

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        • #5
          NOS on Ebay, 6 or 7 years ago...........IIRC, around $16.00 with shipping.


          Rex

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          • #6
            Originally posted by Shade View Post
            Sweet, like 12 inch bearing races are just laying around everywhere...
            If you look in the right places, yes. Found a NOS bearing on Fleabay approx 8" in diameter, no bids but mine. Got it for less than $8. Use it to tram alongside the vice.

            Maybe Rode2Rouen will tell us where he got his, what application it was meant for.

            He types faster than me.

            Comment


            • #7
              My tramming aid is a 1-2-3 block I butchrerd up with belt sanded extra large champhers (actually 20 degree ramps) on one end for the indicator contact to ride up on. I can move it anywhere around the table including around the mounted vise. Small, light, portable.

              Not to dis re-purposed brake disks and bearing races. They work good and form a continuous surface.

              BTW, anyone ever thought to scrape a circular flat from a de-hubbed brake disk? Like in Shade's OP? Scrape both sides parallel? Use it for tramming? As a parallel to raise work with interfering features underneath? Scraping stuff with a raised pivot like under a compound on a larger lathe?
              Last edited by Forrest Addy; 06-04-2013, 12:18 PM.

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              • #8
                I poked around on eBay and got a new rotor for about 10$ including free shipping. Was from a place selling rotors but I just took their generic example from some off the wall vehicle and ordered it. I'm sure it was, by far, the cheapest rotor they had and was just used to get the buyers attention.

                It was made offshore too.

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                • #9
                  http://bbs.homeshopmachinist.net/thr...scraping+rotor

                  post #6

                  while a 280 mm rotor (350 mm for racing rotor) might be a good idea to tram in the area under a vise, for a real mill you have to use something like this, i believe, to get it right:

                  Last edited by dian; 06-04-2013, 01:09 PM.

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                  • #10
                    I bought the EZ Tram from Enco a while back, don't need no stinkin' bearing . You can tram in both directions in a minute or two. Just set it on a surface plate, zero the indicators, and adjust the head. Done! Bob.

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                    • #11
                      Shade-
                      What kind of lathe is that.
                      It looks pretty cool.
                      --Doozer
                      DZER

                      Comment


                      • #12
                        Originally posted by Rosco-P View Post
                        Maybe Rode2Rouen will tell us where he got his, what application it was meant for.

                        I just went out to the garage and checked my bearing race..........Bower #JM738210J44B
                        No clue what its intended use is/was, but it sure gets the job done for trammin'!

                        NOTE: I measured the OD and it's 10.25".


                        Rex

                        Comment


                        • #13
                          Originally posted by Doozer View Post
                          Shade-
                          What kind of lathe is that.
                          It looks pretty cool.
                          --Doozer
                          Thanks, Its a Bridgeport... Romi Tormax 13-5 1989
                          5 HP 230V 3 phase (I run it off a PRC)
                          13 inch swing, you can squeeze 13.5 in over the bed
                          60 in bed, 48 inch of travel on the carriage
                          Taper turning attachement
                          12 speeds 50-2500 rpm
                          More thread sizes than I will every turn

                          Solid low hour machine.





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                          • #14
                            Originally posted by Shade View Post
                            Turning second side.
                            What method did you use to secure the work to the faceplate? Bolts from the back? Thanks.
                            Bill

                            Being ROAD KILL on the Information Super Highway and Electronically Challenged really SUCKS!!

                            Every problem can be solved through the proper application of explosives, duct tape, teflon, WD-40, or any combo of the aforementioned items.

                            Comment


                            • #15
                              Did you ever suspect Romi is related to Nardini?
                              Both made in Brazil and damn if they don't look very similar.
                              I once has a Nardini at work and it was a super great lathe.
                              I think if I found a Nardini or a Romi that I would buy it for myself.
                              ? Does your Romi have the power feed kick-out feature for the carriage?

                              --Doozer
                              DZER

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