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<div>Sean,</div><div>Thanks' I am starting to wonder if the shaft might have been bent to start with. I did not throttle down the heat, but good idea and I will do that next time.</div><div>Hank</div><div><br></div>
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On Sunday, December 24, 2017, 12:14:31 PM MST, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv3219632689"><div>A full anneal with the part sufficiently supported to prevent any sag under its own weight. The part (steel alloy, I assume?) must be heated above its recrystallization temperature, held to soak through at that temperature, and then cooled very slowly. You can build a quick and dirty oven out of brick, using a gas burner? I do in situ heat treatments on large parts using electric heater consoles (resistive or induction), but these can be expensive to rent.<br clear="none"><br clear="none">Your one end at a time trick might work. You just have to slow the cooling down even more by throttling the fuel or gradually moving the burner away over the course of hours - not minutes.<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><br clear="none">-------- Original Message --------<br clear="none">On Dec 24, 2017, 08:48, hank pronk via Personal_Submersibles < personal_submersibles@psubs.org> wrote:<blockquote class="yiv3219632689protonmail_quote"><br clear="none"></blockquote></div><div class="yiv3219632689yqt2617162673" id="yiv3219632689yqt13772"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Hi All,</div><div>Looking for an old timer trick to soften a shaft without warping it. I am on my second try and it is good but not perfect. I had to soften the ends of a 20mm shaft so I could drill one end and make a keyway on the other end. I heated the ends slowly until they just turned orange and let sit to cool. I did one end at a time. </div><div>Any tricks to this?</div><div>Hank</div></div></div></div></div><div class="yqt2617162673" id="yqt14632">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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