Adding to what Ray 54 said,  Going back to my grandad and uncles in the 30s everybody sat on the left, we all kinda disk the same way turning left with the  disk. As to what Ray 54 said me being a California kid and being around KILLEFER disks all my life that were angled to the left I thought every disk was the same, surprise I moved to Whitman county WA. and their Killefers are angled to the right!!!  I asked a now retired John Deere Caterpillar salesman why the rest of the world angled left and Whitman County angled right he had no idea!  Long story short I still have 4 KILLEFER disks angled left if I tried to change direction now after 60 plus years it would end up a big Train Wreck!!!!  17afarmer

I have spent most of my tractor driving in open fields with no boss other than higher powers, man has little influence on. So I have done a few nonconventional passes across a field. Boredom is a terrible thing, and good way to damage equipment. I have spent plenty of time in walnut orchards as well, all decisions about were to drive have been made by the person laying it out. The closed end of disc needs to be toward the tree. As 17A put it you turn to the left in California ( oh boy is this why the state of California to where we are today, way too much thinking for a dumb tractor operator) . So the day you start dragging it smooth I always tried evening out steering clutch ware and turned right, just because I could.

Back to that boredom issue back when I was a pup. Late in the afternoon, getting warm in spring, the dirt very powdery lots of dust, low limbs and no limb lifters on Cat , and the orchard had left over trees left when it was replanted that where way out of the row. The old 4r D6 rolling right along in 3rd maybe 4th gear even because it was a flat part of a mostly nasty steep place. Oh that poor old Killefer disc, I spent the whole next day putting it back to right. I guess since I had to fix my screw up it has stuck with me to be more careful from then on. Not that I have not had several other miss haps over the years.

Ray 54. When I got turned loose as a kid all my dad said was DON’T Turn right DON’T tear the disk tongue off this would be a oil bath KILLEFER that was it. 17afarmer

Okay you LEFTIES (LOL). Pay attention to the hitch on the 1200 series JD Killefer, say a 12' model; the correct mounting has it so IF you turned to the right (whether on purpose or not), it will not hurt the slide bar adjuster, because it is mounted to the left, not to the right!!! It's like grader tires, some say its incorrectly installed, compared to many other brands of disks.
And yes, as a 12 year old, my brother told me DO NOT turn right, well I just HAD to do it to see what would happen. LOL. JM

With any offset disc I have seen in California you must turn left unless it has hydraulic or a properly adjusted turning bar so the disc can be closed when turning right. In the absence of either, the field must be cut out in lands by striking out across the field, turning left and coming back next to the first cut. This way you will leave a ridge in the center and a dead furrow between lands. If you go around a field from the outside working in turning left it will leave the field horribly ridged at each round. The proper way to work a field from the outside in is to turn right but you must have the above mentioned turning bar or hydraulic to close disc. If you turn right with an open disc you will dig a hole and possibly break blades.

Lets not forget, turning left, skipping a row, D4 pulling disc and ring roller, saved a lot of equip and "tractor blight".
What are limb lifters? You learned fast to duck and throw the clutch!
As young kid, working large burned safflower stubble, 3t D7 and 15' jd disc, 3rd gear, 1hr 20 min first round, froze gallon thermos at night, tea water by 10AM, all for the before taxes, $16.50 a day! 10 hrs, we ate on the fly, why stop, no shade anywhere!
117 f on seat before noon!
BORED, drew pics in dust on hood to see how long they would last, clods on deck to throw at rabbits.

OH, crawl off, fuel, grease, head for labor camp, cant hear the car engine and the radio must be on the fritz, volume is very weak.
FUN, NOT!

Amateurs... LOL. Did I ever tell the stories about when I used to really work? Just a few times maybe...
I "tractor blighted" a few trees before; surprised that my dad never jumped my case about it.
Good times as far as I am concerned. I can chuckle about having the change my bath water 3x, because pulling a scraper all day kicks up a LOT of dust! JM

Here's some diskin! Rome TRCH 12-36 Disk