Posted by jackinok on October 21, 2011 at 07:59:55 from (162.58.82.136):
In Reply to: Plow Shares (wornout) posted by JD Farmer on October 20, 2011 at 08:30:51:
heres the trick on hardening one,do not heat one cherry red,when you do its hot clear through,if you are going to work it,just heat it to a dull red(you have to have a dark place for this,you cant tell outside in the sun generally)heat it until its just dull red and quickly quench it by SLOWLY laying it FLAT with the whole bottom of share down in a pan of water.if you dip it point first you will draw the heat to point and it will harden but not the rest.you need to resurface harden the whole share.just slowly dip it in water the same way it sits on plow.and then drop it in to cool.heres basically what happens,when you heat one and temper it you align all the molecules in the steel one drection.this leaves it very hard and resistant to wear but its also brittle because the molecules are laying side by side and they are not interlocked like a piece of fiberglass or something.this makes it easy to break along this line and it will snap right off.by leaveing the center of your share soft you greatly increase the breaking strength of steel simply because those molecules are interwoven with each other.by just heating the share to a dull red,where the center is cooler, you can achieve the best of both.does that make sense? the REASON you quench the share in water by laying it flat is that you align the molecules in that diretion.this makes soil and things slide off easier ,but it it also makes it wear longer.and because the piece is longer that direction its naturally stronger.if you dip JUST the point,you align the molecules along that line and point is prone to snap right down that line simply because its narrower there.its like bending a piece of baling wire and a 2 ft wide steel plate , plate its simply stronger because of its mass. by aligning molecules down the length of share you take advantage of its mass.all this sounds hard but its really not if you have a way of heating the whole share evenly.torch wont do it usually because its too uneven heat,and it takes a fairly large furnace to get a whole share in. if it were myself,i would try to contact one of the amish folks, or one of their splinter groups.they could most likely tell you of a blacksmith in your area that still does this.if you could actually get a few folks in your club to go along with you you may get it done fairly cheaply.BUT,let me tell you,just between freinds,$31 is CHEAP for a share these days i would buy a bunch for my plow at that price.i doubt ( i honestly dont know) that a blacksmith would rebuild one any cheaper.they would have to be close to you or the shipping alone would be over that these days.any way thats the theory behind it.practice?well your sort of on your own there.LOL
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