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Re: [Enfield] oval brake drum

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  • Al
    Your drum may not be round, but more likely than not, your shoes may not have a radius that conforms perfectly to the drum. A high spot on the linings or
    Message 1 of 8 , Oct 1, 2006
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      Your drum may not be round, but more likely than not,
      your shoes may not have a radius that conforms
      perfectly to the drum. A high spot on the linings or
      shoes not fully retracted by the return springs would
      also cause the contact noise. Also, it seems to me
      that a drum that was truely oval would cause an
      audible indication of contact twice with each
      rotation.

      I would suggest , if there is no safety problem
      indicated, that you put more miles on the bike before
      removing the wheel to do an inspection /measurement.




      --- c1skout1 <c1skout1@...> wrote:

      > I've noticed that my front brake drum must not be
      > round... with the
      > wheel raised if I spin it by hand it drags in one
      > spot. I haven't felt
      > it shaking or vibrating on the road yet, but I also
      > haven't had
      > occasion to use them enough to get them very warm.
      > The adjustment of
      > mine must be pretty good because I'm impressed with
      > how well it hauls
      > the bike down from my "high" break-in velocities.
      > Can the drums be
      > turned on an auto brake lathe? Would the hub need to
      > be removed from
      > the wheel to do this? Is there an at-home method to
      > help this? The
      > bike has only 600 miles so whatever runout there is
      > probably was there
      > from new.
      >
      >
      >
      >



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    • Tim
      The lathe turned finish on the brake drums can be very rough, and is often eccentric to some degree... (All four brakes on my two bikes had eccentric drums)
      Message 2 of 8 , Oct 1, 2006
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        The lathe turned finish on the brake drums can be very rough, and is
        often eccentric to some degree...
        (All four brakes on my two bikes had eccentric drums)
        The best repair is to dismount the wheel, remove the axle and bearings,
        and take the wheel and brake plate assembly to a brake specialist for
        grinding; not turning.
        They will mount the wheel up true to the bearing seats and precission
        grind the drum insert, and re radius the brake shoes to suit the
        slightly larger drum.
        With correct adjustment, and fitting a heavy duty brake cable, the
        improvement is very noticeable.
        Cost is minimal and worth every penny.

        Tim
        N.Z.

        "c1skout1" <c1skout1@...> wrote:
        >
        > I've noticed that my front brake drum must not be round... with the
        > wheel raised if I spin it by hand it drags in one spot.
      • c1skout1
        ... bearings, ... I don t think there are any brake specialists in my area. I know people who work at each of my local bike dealerships and virtually all of
        Message 3 of 8 , Oct 1, 2006
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          --- In royalenfield@yahoogroups.com, "Tim" <tbusby@...> wrote:
          >
          > The lathe turned finish on the brake drums can be very rough, and is
          > often eccentric to some degree...
          > (All four brakes on my two bikes had eccentric drums)
          > The best repair is to dismount the wheel, remove the axle and
          bearings,
          > and take the wheel and brake plate assembly to a brake specialist > >


          I don't think there are any brake specialists in my area. I know
          people who work at each of my local bike dealerships and virtually all
          of the people with independant bike shops and I don't think any of
          them have specialty equipment for grinding drums. That's why my
          question about the auto brake lathe. Does anybody know of a motorcycle
          shop that does brake drums in west-central PA?
        • Tim
          Yellow pages will reval one close by. I did a quick google search PA Brake Specialist and turned up quite a few... Tim N.Z.
          Message 4 of 8 , Oct 1, 2006
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            Yellow pages will reval one close by.
            I did a quick google search PA Brake Specialist and turned up quite a
            few...

            Tim
            N.Z.


            "c1skout1" <c1skout1@...> wrote:

            > I don't think there are any brake specialists in my area.
          • c1skout1
            ... Tim, I just did the google and yellow pages like you suggested... although google shows a lot of hits when you start reading through them you see that they
            Message 5 of 8 , Oct 1, 2006
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              --- In royalenfield@yahoogroups.com, "Tim" <tbusby@...> wrote:
              >
              > Yellow pages will reval one close by.
              > I did a quick google search PA Brake Specialist and turned up quite a
              > few...
              >
              > Tim
              > N.Z.
              >
              >
              Tim,
              I just did the google and yellow pages like you suggested... although
              google shows a lot of hits when you start reading through them you see
              that they don't really apply to what I need. I did find one though on
              the fourth or fifth page who specialized in truing motorcycle brakes,
              but he was in Aukland N.Z. I'll keep looking and asking around home
              here. There has to be someone who can do this. I have a friend with a
              machile shop but he has no lathe that would accept a laced-up wheel,
              only a hub.
            • Tim
              The wheel must be in fully built condition, the truing of the rim will and does distort the drum. Tim N.Z. c1skout1 wrote: I have a friend
              Message 6 of 8 , Oct 1, 2006
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                The wheel must be in fully built condition, the truing of the rim will
                and does distort the drum.

                Tim
                N.Z.


                "c1skout1" <c1skout1@...> wrote:
                I have a friend with a
                > machile shop but he has no lathe that would accept a laced-up wheel,
                > only a hub.
                >
              • c1skout1
                ... will ... Thats what I thought
                Message 7 of 8 , Oct 2, 2006
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                  --- In royalenfield@yahoogroups.com, "Tim" <tbusby@...> wrote:
                  >
                  > The wheel must be in fully built condition, the truing of the rim
                  will
                  > and does distort the drum.
                  >
                  > Tim
                  > N.Z.
                  >
                  >

                  Thats what I thought
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