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<blockquote data-quote="Bill Coye" data-source="post: 1031235" data-attributes="member: 10719"><p>Got all of the mill scale ground off which is a bear</p><p></p><p><strong>[Broken External Image]</strong></p><p></p><p>Scribe some lines along the edge so you know where your going!</p><p></p><p>Fail to plan, plan to fail <img src="/images/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p><strong>[Broken External Image]</strong></p><p></p><p>Hollow ground on an 8" wheel with 60 grit then 120 grit. We'll leave it there for heat treat</p><p><strong>[Broken External Image]</strong></p><p></p><p><strong>[Broken External Image]</strong></p><p></p><p>Thumb serrations now before heat treating - other wise it'll be VERY difficult to cut those afterwards.</p><p><strong>[Broken External Image]</strong></p><p></p><p>That sucker is HOT. The blade gets "plate quenched' - two 1" pieces of aluminum draw the heat out in a rapid fashion to harden the steel properly.</p><p><strong>[Broken External Image]</strong></p><p></p><p>Into the oven at 1940'F for soak time of 20 minutes (takes an hour for the oven to ramp up that high), then temper the blade at 700'F for two hours. Now for the -300F liquid nitrogen cryogenic treatment</p><p><strong>[Broken External Image]</strong></p><p></p><p>The Oscar Mike and an Alpha Echo out of cryo</p><p><strong>[Broken External Image]</strong></p><p></p><p>After a second temper cycle, time to clean it up</p><p><strong>[Broken External Image]</strong></p></blockquote><p></p>
[QUOTE="Bill Coye, post: 1031235, member: 10719"] Got all of the mill scale ground off which is a bear [b][Broken External Image][/b] Scribe some lines along the edge so you know where your going! Fail to plan, plan to fail :) [b][Broken External Image][/b] Hollow ground on an 8" wheel with 60 grit then 120 grit. We'll leave it there for heat treat [b][Broken External Image][/b] [b][Broken External Image][/b] Thumb serrations now before heat treating - other wise it'll be VERY difficult to cut those afterwards. [b][Broken External Image][/b] That sucker is HOT. The blade gets "plate quenched' - two 1" pieces of aluminum draw the heat out in a rapid fashion to harden the steel properly. [b][Broken External Image][/b] Into the oven at 1940'F for soak time of 20 minutes (takes an hour for the oven to ramp up that high), then temper the blade at 700'F for two hours. Now for the -300F liquid nitrogen cryogenic treatment [b][Broken External Image][/b] The Oscar Mike and an Alpha Echo out of cryo [b][Broken External Image][/b] After a second temper cycle, time to clean it up [b][Broken External Image][/b] [/QUOTE]
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