[Healeys] Fwd: Re: Drum Balancing

David P frogeye at porterscustom.com
Sun Feb 18 17:04:31 MST 2018 




..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
>     <mailto: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 <mailto: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
>     <mailto:healeys-bounces at autox.team.net>> on behalf of Michael
>     MacLean <rrengineer.mike at att.net <mailto:rrengineer.mike at att.net>>
>     *Sent:* Friday, February 16, 2018 6:55 AM
>     *To:* llennep at verizon.net <mailto:llennep at verizon.net>;
>     healeys at autox.team.net <mailto:healeys at autox.team.net>
>     *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
>
>         <llennep at verizon.net <mailto: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
>         <mailto:rrengineer.mike at att.net>>
>         To: Healey List <healeys at autox.team.net
>         <mailto: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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-- 
Porter Custom Bicycles 2902 Arno St. NE Albuquerque, NM. My World go here:www.porterbikes.com/



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