..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
>
> Image removed by sender.
>
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>
> On Fri, Feb 16, 2018 at 3:36 PM, jim brown <jbrown5093 at yahoo.com
>
> 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
>
> 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
> *Sent:* Friday, February 16, 2018 6:55 AM
> *Subject:* Re: [Healeys] Drum Balancing
>
> Where did you get them balanced and how was it done?
>
> Mike
>
> Sent from Yahoo Mail on Android
> <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
> On Fri, Feb 16, 2018 at 12:45 AM, Keith Pennell
>
>
> 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
>
> Sent from Yahoo Mail on Android
> <https://overview.mail.yahoo.com/mobile/?.src=Android>
>
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