here's a p,artial answer: my local scrapyard gets a large variety of ss. most in quite useable sheet sizes. the prices are vastly cheaper than getting tthe stuff thru metal retailers.. this is also true of most other metals. i have made mostly pendants, bracelets, as well as buckles with the...
i never grew into the powder horn thingy. never did much except embellish them. a friend did jillions of these. it was thru him i got the pigment/wax thingy.
i did a btt of stuff, mostly horns. such was for those involved in front stuffing guns. i incorporated suitable pigment into liquid wax. when the wax soliidified i'd simply rub it into the engraved areas. i;d prep the horn to a reasonable polish, engrave, then add the wax. after that i would...
that you have to ask tells me you're not ready to actually do this---- just yet.
get yerself some brass fittings at a local junk yard. also get some flat sheet brass and copper. the curved fittings will give you insight as to how to deal with curved surfaces. most any job can be done using h&c...
i never did a special geometry. just a 45 face with or wo heel. suffice to say. i never practiced the cut enough to become satisfied with my results. my customers were happy, just not me.
kinda strange. roger preferred a square for this cut. i was more able to control the flat graver. never hurts to xperiment. in this art one size does not always fit all.
not sure what's specified but i always used low viscosity oil. my meister is still alive and well. the only real issue i had with it was belt wear. be sure to clean the handpiece with naphtha or such after each use.