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post #1 of 10 Old 07-04-2013, 08:04 AM Thread Starter
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Turning and uncut circle radius confusion

I am confused how JD measures and publishes these numbers.

Take the X500 with a 48" deck for example:
Turning radius: 22"
Uncut circle radius: 27"

1. Does radius actually mean geometric radius (i.e. half the diameter), or do they mean diameter? I.e. would the X500 above leave a 27" or a 27x2=54" uncut circle of grass if you drive around in a circle?

"Turning radius" for a car actually is "turning circle", i.e. diameter. I've seen mixed comments about this. For example, in this thread, the owner says his X324 leaves a 9" diameter uncut circle of grass, despite the JD specs saying the uncut circle radius is 9".

https://www.mytractorforum.com/showthread.php?t=44351

2. Regardless, how can the uncut circle radius be larger than the turning radius? If the deck protrudes out the sides, it should be less, no? How does JD measure turning radius?
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post #2 of 10 Old 07-04-2013, 08:30 AM
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Re: Turning and uncut circle radius confusion

The deck is in front of the rear tires and the rear tires do the smallest radius/diameter. So the deck cut radius/diameter would be bigger.

As far as JD, 22" radius sounds much better than 44"diameter. Its all about marketing/sales pitch.

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Last edited by bwg561; 07-04-2013 at 08:47 AM.
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post #3 of 10 Old 07-04-2013, 09:08 AM
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Re: Turning and uncut circle radius confusion

The neat feature about the x324 with 4 wheel steer is cutting tight around tree's. I spray a little Roundup around my tree's and seldom use a wacker.
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post #4 of 10 Old 07-04-2013, 09:35 AM
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Re: Turning and uncut circle radius confusion

I think you're making too big of a deal out of this... The X500s turn pretty tight and cut reasonably close with a 48" deck (and even closer with the 54"). The X300s do seem to turn just a bit tighter though. You can always get a X324 or X534 if turning radius is that important to you. Go test drive a few machines and see what you can drive around.

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post #5 of 10 Old 07-04-2013, 09:48 AM
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Re: Turning and uncut circle radius confusion

Turning radius us measured at the rear tire. Take a piece of chalk on a stick and hold it right beside the tire where it contacts the ground - then drive in as tight a circle you can. The circle you just made with the chalk is the diameter..../2 = radius.

Uncut circle is what the deck leaves when you make a circle. AWS doesn't reduce the radius, but does reduce the uncut circle tremendously. You sort of have to see it in action.


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post #6 of 10 Old 07-04-2013, 10:39 AM
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Re: Turning and uncut circle radius confusion

This is an interesting question, I've always assumed radius meant radius, not diameter.
I need to mow my grass tomorrow, I'm going to check the uncut circle radius of my X304 and compare it to JD's spec's. Then I'll know, and I'll report back here.

The real problem here, is that all the different mfgs use different measurements. It's OK to compare a D110, to an X300, to an X304, to an X500, the real problem is comparing a JD, to a Simplicity, to a Cub Cadet, to a Husqvarna, to a Kubota. The OPEI should develope a standard that all mfg measure against.

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post #7 of 10 Old 07-04-2013, 02:28 PM
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Re: Turning and uncut circle radius confusion

I was also confused about this when I was looking to purchase last year. I took an 18" dia. drum(tree) to the dealership, set it up in their parking lot and tried a simulated cut around it. I was surprised to find out the 2ws JDs and Cadets didn't even come close with a 42" deck, which I needed, so a deal breaker for me. Maybe bigger decks are different? Don't know. I think the JD's advertized an 18" turn diameter? and the Cadets 12", Sears 8", which I believe is the rear wheel track. If you have big dia. trees or plan to wack anyway, not a big deal.
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post #8 of 10 Old 07-04-2013, 02:29 PM
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Re: Turning and uncut circle radius confusion

I just checked my X304, it leaves a 40" dia. turning circle inside of the rear wheels, it's real easy to see in the grass. That's a 20" radius. With the deck on, I leave a 32" uncut circle dia., or 16" radius uncut circle, exactly what JD says in their spec.

For contrast I tried my WH312-8/42"deck, it leaves a 40" turning radius circle, and a 36" radius uncut circle. It drives like a tank.

steve
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post #9 of 10 Old 07-04-2013, 05:01 PM
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Re: Turning and uncut circle radius confusion

I won't even measure a right turn on my 214 - I'd end up in the neighbor's yard...
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post #10 of 10 Old 07-04-2013, 05:26 PM
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Re: Turning and uncut circle radius confusion

It is kind of like the reason women can't parallel park. We have spent years convincing them what 9" is and so they hit the curb every time.

Larry ( in Southern Ontario )

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