Posted by Texasmark1 on October 08, 2014 at 04:26:38 from (184.20.48.56):
In Reply to: drawbars posted by Mike(NEOhio) on October 07, 2014 at 19:24:23:
Snap to me means tempered steel. It is strong till it gets to it's yield point and then snaps. Mild example is the shear bolt in the PTO shaft of my baler. JD part is a grade 8. JD says that the grade 8 will snap clean and you can get it out where a grade 2 will smear.
Mild steel will slowly bend as you exceed the yield point but will not snap. All in the alloys and tempering (annealing).
I would think that you would want temper to keep it from bending. However, constant pounding especially with spikes above the yield point could shear it.
I saw a connector for a dump truck tag along "Pup" shear right into. The constant pounding of the Pup tongue fatugued the metal and it broke. It was cast however.
I have taken ball bearing races and pounded on them till they crumbled.
I had a drawbar once that needed another hole. I took it to a machine shop and they were able to drill a 1" dia. hole with no apparent problem. Guy didn't charge much and didn't say anything about having to remove temper and re -annealing it.
Just remembered something. Once I hired a neighbor teen and asked him to load some hay on a 16' tandem flat bed. The hitch was on my truck and was not all that thick, maybe cat 2. These trailers have a long distance from the tandem to the hitch as compared to the rear making them tongue heavy.
He loads about 4 high starting in the very front and loads up rather than one full layer at a time. Next thing you know the tongue bends, didn't break just bent.
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