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Hot Raising an Umbo PDF Print E-mail
Written by Erick Davidson   
Thursday, 18 January 2007

applying olive oil finish I took the opportunity a couple of weekends ago to do a raised umbo to adorn the center of a Viking round, one of three shields I am making to offer the victor in our upcoming twentieth Annual White Shield tourney. In addition to the round, we are providing a Norman kite as well as a Maximilian buckler. The victor will get first choice and the other two will be auctioned off. Anywho, I want these prizes to be worthy of the victor who more often than not goes on to win the next West Crowne a couple weeks later. The shields are meant to be as correct as I can make them, so I took the time to raise the umbo first, I love to raise and each time I take the time it makes me want to do more. Time permitting, I wish to raise my first helm this summer.

I neglected to record the first steps, as it didn’t occur to me as I was having too much fun. I grabbed my camera after I had already finished two courses.

third course of raising an umbo
Didn't think to grab my camera until I had already sunk the center and completed the first two raising courses. Here I am getting ready to start the third course.
 mark the center before going  here I have re marked the center before I begin the third course
 starting the third course of raising an umbo  Here the third course begins around the center, as I push the material inward and down
 raising an umbo  the first pass around the top is finished as I move down to make the second pass, pushing the shelf lower with each pass.
 raising an umbo  Further down with each pass, compressing the metal
 heating metal to soften it  further still, heating a short section at a time, I wish I had a second pair of hands or a gas miser valve! At this point I realize I am running out of oxygen.
 raising a shield boss  At this point I see again how certain helm shapes lend themelves to raising, sallets, chap de fers. I could see making a mini sallet at this point.
 third course of raising is finished  Third course of raising finished
 marking the lip for the shield boss  Scribing a line inside and out as to where I want the lip of the umbo so I can begin pushing that out.
 mark the line with silver pen Trace over the scribe line with silver pencil, to see through the heat
 raising a shield boss  Run a shallow line around the inside with a blunt chisel into a wood block to help define the line so it will stay on the stake better without so much visualization.
 chiseled line on the inside of the umbo  Here is my chisel line from the inside
 deepening the line  Set the line further over my creasing stake in preparation to work in the saddle.
 working the anticlastic curve  Here begins the anticlastic curve into the saddle stake.
 last raising course Moving to the larger stake, I push down the ledge from the last raising course. At this point I run out of oxygen for my oxy-propylene torch, so I am almost done for the day.
 raising an umbo Halfway through, now doing this cold
 end of fourth pass Done for the night, at this point I am debating how tall I want this to be. I started with a 12 inch circle, and now have a four inch tall, 9 1/2 inch cone.
 flaring the edge of the shield boss  Next day, I go get some oxygen and mark out my base in silver pencil before flaring it out over the anvil edge
 defining the ridge  I run a chisel around the base to define the line and spend some time on my creasing stake defining the ridge more sharply
 taking scale off with acid Putting it in the acid to take the scale off.
 layout and prep work for umbo edge  Lay out and punching of the holes and scallops
 trimming and scalloping edge Ttrimmed off edge with beverly shear and filed burr
 applying olive oil finish  Finished with a coating of olive oil and torch. Looks more even than the flash makes it appear.
 Finished umbo Last shot, ready to mount in the center of the viking round for our 20th annual White Shield Tourney!
Last Updated ( Thursday, 18 January 2007 )
 
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