[Healeys] Fwd: Re: Drum Balancing
John Sims
ahbn6 at verizon.net
Mon Feb 19 13:53:10 MST 2018
I have been watching this thread with interest. While I have not had a
Healey for several years now, about 10 years ago I had the dreaded scuttle
shake at 55MPH and cured it by taking my drums to a local tire store that
has been in business for years (not one of the chains that heavily advertise
but hire kids with all thumbs and that have never heard of a wire wheel).
Anyway, they had the proper milling machines and for about 20 bucks apiece,
trued the drums and balanced them. Goodbye scuttle shake. Your task, should
you accept it, is to find such a shop. Otherwise, this message will
disappear in 30 seconds as do all good pieces of information in the world of
Mission Impossible.
John Sims
Aberdeen, NJ
www.healey6.com
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of David P
Sent: Sunday, February 18, 2018 7:05 PM
To: Harold Manifold; healeys at autox.team.net
Subject: [Healeys] Fwd: Re: Drum Balancing
..a simple bubble balance works well once the center of the drum is
established.
On 2/18/2018 11:32 AM, Harold Manifold wrote:
There is a lot of good discussion on this topic and although my Healey drums
and wires wheels are in my basement and not on my car I can offer some
suggestions that may help. For a rotating mass two types of balancing is
required, static and dynamic. If the rotating mass was a thin disk it would
be essentially a two dimensional object and you could add or subtract weight
to the perimeter until the disk didn't move no matter how it was rotated. It
would be statically balanced. Unfortunately the rotating tires, wheels,
hubs, brakes and knock offs on our Healey's is a three dimensional system
made up of various components each of which can be out of round and out of
balance. All three dimensional systems must be balanced statically and
dynamically to remove vibrations. Suggestion number one is if the shop doing
the balancing doesn't know the difference find another shop. The perfect
balancing machine would accept all of the rotating parts as one complete
assembly and rotate about the same centre as the axle. Unfortunately, a
machine like this is not usually available to Healey owners. The next option
is to balance the parts separately. Check the wheel mounting surfaces on the
hubs for run out on the car using a dial gauge and if they run true likely
they are fine. The brake drums are castings and could be out of balance from
the casting process or subsequent machining. The drums can be balanced by
either removing weight or adding weight the same way tires are balanced. I
prefer the adding weight method as it allows for some trail and error and
the weight can be added close to where it is needed. Ideally the drums and
hubs would be balanced as one unit. Balancing tires and wheels is a similar
process. Step one is to check the wheels are straight and round if they are
not balancing may not be possible. Literature I have suggests "wobble"
should be less than 0.055". See attached. Assuming the balancing machine has
the capability to do both a static and dynamic balance the tire and wheel
must be rotated about the same centre as if it were on the car. With centre
lock wire wheels an adapter is needed for most balancing machines. See the
attached PDF for a description. Another point to review with the balancing
shop. If they cannot mount the wheel on the balancing machine the same way
it is mounted on the car find another shop. There is a link below to the
Wikipedia page on balancing rotating masses and YouTube video of a brake
drum and hub being balanced together.
https://en.wikipedia.org/wiki/Balancing_of_rotating_masses
https://www.youtube.com/watch?v=iy-CD3ppfJU
Probably way too much information but it may save some from wasting money on
the wrong method or irreversibly grinding away brake drums with a shop that
doesn't fully understand the balancing process.
Good luck to all .... Harold
_____
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Mirek
Sharp
Sent: Saturday, February 17, 2018 7:21 PM
To: 'Charlie Baldwin'; healeys at autox.team.net
Subject: Re: [Healeys] Drum Balancing
Can someone clarify a few of the comments on drum balancing. A couple of
people said they had them done by various specialists on a lathe by skimming
the fins. This will make the outside of the drum round, which I imagine
must help, but that is different from balancing, which I understand may
involve subtracting and/or adding weight in strategic places, as one would
in balancing a tyre. I don't think balancing can be achieved simply by
truing the outside of the drum, but I am glad to be corrected. So by drum
balancing, are these wonderful accolades a result of drum truing or drum
balancing?
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Charlie
Baldwin
Sent: February-17-18 6:25 AM
To: healeys at autox.team.net
Subject: Re: [Healeys] Drum Balancing
One major thing to keep in mind when having someone balance your wheels or
shave your tires is how they are mounted on their machine. Wire wheels must
be mounted on the machined surfaces not just with internal cones as a
company that does not normally balance wire wheels would do. It won't do
any good to shave the tires from the wrong center.
So a specialist who understands British wire wheels is essential to having
the job done properly. Besides Hendrix there is K & T Vintage Sports Cars
in Bethlehem, PA owned by Ken Beck, an Austin-Healey owner. Check their
website at http://www.ktvintagecars.com/ for a video of the tire shaving
process. I have some new tires for my MG wire wheels that I will have them
mount and balance, and shave if required. I know Ken, but never had any
work done by him. Others have great things to say about the process and
their work in general.
I had my drums balanced several years ago by the local NAPA machine shop who
do my engine rebuild machining.
Charlie Baldwin
'62 BT7
On 2/16/2018 9:16 PM, HealeyRick wrote:
Another satisfied customer of Hendrix Wire Wheels. Mounted and balanced my
Dayton wheels, shaved the Michelin's and balanced the rear drums. Had it up
to 104 mph on our speed run last summer (It's got a V8 but the rest of the
suspension is stock Healey) and was smooth all the way up. Drives at 2,000
rpm at 70 mph with its five speed and it's just a joy. Time for new tires
this year and they are going back to Hendrix for the treatment. Probably
the most satisfying money you can spend on a Healey.
Rick Neville
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On Fri, Feb 16, 2018 at 3:36 PM, jim brown <jbrown5093 at yahoo.com> wrote:
Ditto on both of my Bt7 and Bj8. Remarkable difference after Hendrix Wire
Wheel in Greensboro NC got a hold of them. I think he can shave tires also.
Great to work with also
Jim Brown
On Friday, February 16, 2018, 1:52:02 PM EST, Gary R. Brierton
<gbrierton at hotmail.com> wrote:
Allen Hendrix of HendrixWireWheel (in North Carolina) did my BJ8. Rear
Drums and (I think) the drive shaft. I don't know exactly how it is done.
I always just hand the keys to Allen!
Smoothest BJ8 I've ever driven, including 2 purchased new back in the '60's.
_____
From: Healeys <healeys-bounces at autox.team.net> on behalf of Michael MacLean
<rrengineer.mike at att.net>
Sent: Friday, February 16, 2018 6:55 AM
To: llennep at verizon.net; healeys at autox.team.net
Subject: Re: [Healeys] Drum Balancing
Where did you get them balanced and how was it done?
Mike
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On Fri, Feb 16, 2018 at 12:45 AM, Keith Pennell
<llennep at verizon.net> wrote:
Absolutely! Eliminated 50-70% of scuttle shake in daily driving. One of
the best things I ever did to my cars. Have balanced several sets.
-----Original Message-----
From: Michael MacLean <rrengineer.mike at att.net>
To: Healey List <healeys at autox.team.net>
Sent: Fri, Feb 16, 2018 1:22 am
Subject: [Healeys] Drum Balancing
I can understand balancing the front drums on my BN2 to help preclude
scuttle shake, but I am converting to front disc brakes. Is it necessary to
balance the rear drums?
Mike MacLean
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