Page History: Delta 6x48 Sander Drums
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Page Revision: 2009/04/24 01:26
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 Vaughan{Reference:http://owwm.org/viewtopic.php?t=41577|Worn drum on 6x48 sander}{Reference:http://owwm.org/viewtopic.php?t=41720|PM 30 sander belt tracking blues}I'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 angle will likely dictated by the thickness of the drum. When I re-crown, its a matter of reacting to the geometry of whatever's in front of me.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
By Shane Whitlock{Reference:http://owwm.org/viewtopic.php?t=49974|Rockwell Belt Sander Restoration Pics (updated all finished)}. You can see here the drive drum is a little wallowed...
I could of mounted it in the lathe but wanted to try something else out first. I took an old sanding belt and cut a long strip about 2 inches wide out of it. I removed the sanding belt from the sander and turned the machine on. Using the strip of sandpaper I carefully sanded it flat and then slightly crowned the drum. It worked great.
Tracking is great now.
