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Posted by copey [206.80.246.167] on Tuesday, March 23, 2010 at 01:20:21 :
In Reply to: Seattle Brake and clutch, having drums turned problem.. posted by Jonas Smith [67.142.161.23] on Monday, March 22, 2010 at 17:42:37 :
Brake drums are cut on lathes to ensure that the new shoes have a smooth even surface to mate with . What to expect from turning is parallel surfaces at any given point across the drum diameter .Brakes drums suffer from a series of abuse over heated, hard spots,grooving, ect .To get the maximum lining life and best braking drums are turned shoes can be CAM ground and fitted .there are two methods of turning drums as mentioned hubs on races out ,which means you use "collets" on the lathe that take up the place of the bearings > if the Collets are clean and the races clean the brake lathe and is correctly tensioned it will turn the drums very accurately . Here is were the controversy begins ,in actual use the brake drum turns as a mated unit with the hub in theory there should be no difference if the drums were turned with hubs in or hubs off .because a similar set up is used to center the hub less drum > As Chris mentioned hub less drums have been turned for many many years . NOW READ THIS PART Carefully ! When the drum has been removed from the hub you have taken apart 2 pieces that have been mated and ran together for years . If you DID NOT MARK each hubb to each drum in relation to each other and mark a hole on a drum to stud on the hub you may have problems . As there are mating surfaces that should be thoroughly cleaned sanded so the drums are now mounted to the hubbs with out debris rust scale or any thing else that prevent the drum running TRUE on the hubb > as for hubb on or off when turning i would not want live on the difference ~ Copey