[modeleng] Re: Re 3" Burrell

Al,

Never heard of Biros, but then I don't go looking about in Wally World any
more then necessary.

At the GM&O, we first hand scraped  valve seats on the locomotive brake
valves and then used a polishing compound called "Putz Pomade"(sp)  to do a
final lapping.  GM&O would not buy the Putz Pomade so we got it from a bloke
at the IC RR where they kept it for polishing brass doorknobs etc.  We made
our scrapers by hollow grinding 8" trangular files to a sort of rounded
point.  Make good scrapers those files do, provided you are careful not to
over heat them while grinding.

Jesse

> Jesse, "Biros" is a brand of ballpoint pen sold by
> Wal-Mart, et al, here in the States, and I am seeing
> more clearly why Plasticine would work bettter for
> keeping the abrasive from going where it was not
> wanted while lapping the valve face on the Burrell.
> BTW, the best way to do a Gunmetal or Bronze valve
> face must be by scrapping rather than lapping, due to
> the abrasive wanting to imbed itself in the soft
> material?
>
> Al Messer

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