Picked up this Alaska Medal case for an early Elgin B. W. Raymond. The case was in fair condition, but I though it would be fun to clean it up a bit. I used to do stringed instrument finishes in a former life, so I setup my old polishing wheels and gave it a go.
You can see some pitting on the edge of the back closest to you
Here's my buffing setup. I used my 10 inch (25.5 cm) , double wheels on each end of the arbor. One side is dressed with Menzerna Compound (brown), Item # 3169. The other side has Extra fine (ivory), Item # 3174, although to be honest, I can’t remember the last time I put any of the ivory on the clean wheel.
The double wheels that make up the course side. I know the guy on YouTube makes a big noise about a hard wheel for buffing, but I’m really not trying to push a lot of medal around, so I have good success with this setup. I find you have less heat and cutting with a softer wheel. I have bigger wheels (16 inch) too, but don’t really use them much for this application. Not that they wouldn’t work, they're just really expensive, so I save them for finishes, when someone talks me into doing an instrument repair.
My motor base RPM is 1725, and I have 2 to 1 reduction ratio on my pulleys, so my finial RPM at the buffing wheel is 850 or so. Any faster than that and the whole system shakes so much it dances across the floor.
Here’s a link to Steward –McDonald. When I did finishing on a regular bases, I’d by my stuff from them. http://www.stewmac.com/SiteSearch/buffing%20menzerna%20compound.html
Here's the case after buffing but before polishing. You can see the pitting is gone. I'll post another case clean up sometime and use a junkier case so you can really see the difference.