I built it more or less specifically to pull a 1 row spring tooth cultivator, though did forsee wanting to put a ball on a 3pt drawbar to make it a powered trailer tender.. ie.. back up.. lift trailer tounge off ground and then move it.. etc.
I have plenty of other tractors for heavy work or ground engagement, or load lifting. I started out wanting to make this light duty, and for sure designed it that way when I put the engineering calcs on the paper based ont he geometry. ( putting that engineering degree to some use.. :) ) All calcs were based on mild steel.. which is what I used for the rebar as well, only considering root diameter, not the raised diameter. The scrap rebar I'm using ( liberated from work ) stated it was 'weldable'.. though did not list a grade. I'm makeing a few assumptions based on shear, yeild, tensile and compressive strength. the doubled up hard washers I welded back to back and notched for the rebar are a 'fit' test. i actually have clevis ends for them, were I to finish this project, which I do not currently believe I will. as to the rebar quality levels.. I guess that one is a cr@p shoot. I have no way to grade it, nor do I think a yeild test will be practicle to mock up due to cost vs what I learn from observation. i do have a porta power and could frame up a tensile test, but have a feeling that i'll have a yeilding of a weld joint at a conenction as a first failure before i stretched any bar apart... again.. a guess.. as you point out.. it may have a slag include or void or something that made the bar yeild at a few pounds.. I agree.. that could for sure happen.
As for price.. All items of bulk metal are cut ends and or scrap liberated from work. i had an odd assortment of 1.4 and 2" angle irons to work with 1/4".. along with some 1/4, 1/8 and 1/2" bar stock.. plus iron pipe and a piece of cold roled. ( also liberated some decent expanded metal for use on another project! )
not/bolt assortment cam from bags of stuff I had from other projects.
So far I guess I have a pound of 1/8 welding rod in her, plus the electricity for said pount, plus a few cents of abrasive blade on the chop saw and some incalculable and negligible amount of O/A gas used.
twas all scrap.. so.. I've wasted about 5$ worth of rod and zaputrons used to make them smaller.
bolts I can re-use. etc.
as before, thanks for the insite and comments.
I think I'll probably still be directing my limited funds and energies in a different direction however.
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