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Jens A Butler
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 Posted: Fri 01 Dec, 2006 2:07 pm Post subject: Finishing edges of plate armor for strength |
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How much does a rolled edge or wire filled roll finished edge increase the strength of a piece of armor as opposed to just a plain file smoothed edge. Say for instance on a set of knee or elbow cops. I am thinking that the rolled edge looks better and probably wont "bite " into the wearer when struck . I was also thinking it would help resist impact deformation, but I'm wondering to what degree? Is the additional strength worth the extra labor/ cost? And under the right circumstances can one get bye using 16ga steel with rolled edges in place of heavier gauge steel to save weight and increase mobility ? I'm thinking this works on the same sort of principal as corrugated metal roofing or corrugated cardboard.
Jens
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Allan Senefelder
Industry Professional
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| Posted: Fri 01 Dec, 2006 4:51 pm Post subject: |
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Jens, yes edge rolling does increase strength. Edge rolling over wire even more so and counter sinking a rolled edge increases the strength even more. These techniques introduce geomtric shapes to incease strength vs. simply using thicker material so it can be and was used to help reduce weight while maintaining protection.On certain parts edge rolling also insures the safety/comfort of the wearer as in the openings for arm and neck of breast and back plates and of the top lame of a gorget.
Last edited by Allan Senefelder on Fri 01 Dec, 2006 9:47 pm; edited 1 time in total
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Jean Thibodeau
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| Posted: Fri 01 Dec, 2006 7:08 pm Post subject: |
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| Allan Senefelder wrote: | | Jens, yes edge rolling does increase strength. Edge rolling over wire even more so and counter sinking a rolled edge increases the strength even more. These techniques introduce geomtric shapes to incease strength vs. simply using thicker material so it can be and was used to help reduce weight while maintaining protection.On certain parts edge rolling also insures the safety/comfort of the wearer as in the openings for arm and neck of breast and back plates of the top lame of a gorget. |
And with other edges a bevelled edge helps in making weapon points or edges slide off rather than slip between plate lames.
( Learned this from Allan but I think he forgot to mention this.   )
You can easily give up your freedom. You have to fight hard to get it back!
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Randall Moffett
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| Posted: Sat 02 Dec, 2006 12:13 am Post subject: |
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Allan,
That is perfect. I think I might copy that and use it whenever someone asks that question it seems textbook like. (of course I will add Jean comment as well)
RPM
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Steve Grisetti
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| Posted: Sat 02 Dec, 2006 7:48 am Post subject: |
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| Allan Senefelder wrote: | | ... and counter sinking a rolled edge increases the strength even more. |
Allan, I don't quite follow what you mean by "counter sinking a rolled edge". Could you explain? I guess I am thinking of counter sinking in terms of counter sinking a screw, and can't picture how that would apply to the edge of a piece of plate steel.
"...dismount thy tuck, be yare in thy preparation, for thy assailant is quick, skilful, and deadly."
- Sir Toby Belch
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Allan Senefelder
Industry Professional
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| Posted: Sat 02 Dec, 2006 8:09 am Post subject: |
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Steve, the border of your sallet helm is counter sunk, also known as "sunken bordering". When you roll an edge, follow it around after with a chissel (sp) a short distance in (3/16" - 1/4" or so) so that the rolled edge, rather than being "underneath" becomes pronounced . I hope that made sense.
Randal, feel free, theres a great article in the first ARS journal about the history of glancing angles, ( ridging and things like that, again using geometry to make a stronger product) in medieval armour thats worth the read.
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Steve Grisetti
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| Posted: Sat 02 Dec, 2006 9:56 am Post subject: |
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| Allan Senefelder wrote: | | Steve, the border of your sallet helm is counter sunk, also known as "sunken bordering". When you roll an edge, follow it around after with a chissel (sp) a short distance in (3/16" - 1/4" or so) so that the rolled edge, rather than being "underneath" becomes pronounced . I hope that made sense. .... |
OK, I think I understand now. I have attached a (slightly blurry) photo of the border of my sallet. The rolled border projects from the outer surface of the helm. As the border rolls around to the inside, the edge becomes flush with the inside surface of the helm.
 Attachment: 19.71 KB
"...dismount thy tuck, be yare in thy preparation, for thy assailant is quick, skilful, and deadly."
- Sir Toby Belch
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Allan Senefelder
Industry Professional
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| Posted: Sat 02 Dec, 2006 9:59 am Post subject: |
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Bingo!
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This is a standard topic