Topic: Rear Brake Drum Turning


grump40    -- 10-05-2017 @ 1:10 PM
  I'm looking for someone to turn the rear brake drums on my 40. It seems most brake shops and machine shops are set up to do this anymore. Thanks.


kubes40    -- 10-05-2017 @ 2:16 PM
  Any decent machine shop with a lathe that is large enough to accommodate the drum can do this.

Mike "Kube" Kubarth


sarahcecelia    -- 10-05-2017 @ 3:14 PM
  Just call one and tell them they are 12" drums.Any local garage can tell you if they do them, and if they don't, tell you who does.

Regards, Steve Lee


pauls39coupe    -- 10-05-2017 @ 5:19 PM
  It takes a special mandrel and tapered shaft to turn the rear drums. Most shops around here use AMMCO machines but not all have the correct tooling. Keep checking with your local auto machine shops, there must be one with some old geezer working out back who knows what needs to be done.


kubes40    -- 10-05-2017 @ 5:36 PM
  It does not require any special tooling. The drum can be mounted in a lathe and set true and concentric by indicating it in at the bearing surface. This is basic machining 101.
Any decent machinist will know not to clamp it so tight within the jaws so as to deform the drum.
Mandrels were the "quick" way to set a drum up in a dedicated machine. Yeah, faster than a lathe (set up) and the results "okay".

Mike "Kube" Kubarth


pauls39coupe    -- 10-05-2017 @ 5:52 PM
  Kubes is right. A machine shop should be able to clamp the hub and turn it, basic machining. However your local auto store may not have the tooling. AMMCO machines and the like need the mandrel and a tapered shaft to fit the rear hubs on an early Ford. As Mike said you may be best served by going to a true machine shop.


CharlieStephens    -- 10-05-2017 @ 8:25 PM
  grump40,

If you added your general location to your profile (and for a post like this, include it in the body of the post) someone might suggest a local shop. Try calling local Model A and early V8 clubs and ask who they recommend. The same tool to turn the drums was used 1928 through 1948.

Charlie Stephens


supereal    -- 10-07-2017 @ 1:16 PM
  Speaking as an "old geezer", we do these drums in our machine shop, and others likely can, too. If doing the job in a lathe, the end of an axle makes a good mandrel. Tooling and experience for and with old vehicles is getting scarce, as drum brakes are obsolete for cars and light trucks. Most good truck shops can still do drums. Don't cut more than .060, in any case.


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