Page History: Delta 6x48 Sander Drums
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Page Revision: 2009/04/24 00:56
IN PROGRESSExamples of Drum Condition
Examples from Bob Vaughan.
Outside ends of worn drums:
Inside of worn drums:
The damages shown in the previous two pictures are generally the results of worn bearings that have frozen on the shafts.
The images below are examples of improper crowns caused by wear, in this case shown on a Powermatic 6x48 sander.{Reference:http://owwm.org/viewtopic.php?t=41577|Worn drum on 6x48 sander} The crown needs to be corrected for proper tracking.
Re-Crowning Drums
Turning on a Lathe
By Bob VaughanI'll put the shaft in the lathe, then put on both drums with needed spacers, then turn both drums at the same time using the compound over at some slight angle like 1ยบ or so per side, giving a slight V crown rather than a round one. The big thing is to get rid of that upturn profile on the outer edges. Its those outer edge diameters that makes tracking impossible under load. Below is an idler drum restored on the lathe.
Re-Crowing Lower Drum While On The Machine
Shane Whitlock re-crowned his lower drum while it was fitted to the machine{Reference:http://owwm.org/viewtopic.php?t=49974|Rockwell Belt Sander Restoration Pics (updated all finished)}. He started with the worn drum below:
He then cut a 2" wide strip from an old sanding belt, turned the machine one and used the strip to sand the drum flat and then slightly crowned:
The resulting crown gave great tracking:
