Safety Tips

[JOR_EL]

Re: Safety Tips - Tractor Overturn Hazards

John,

Just a comment while you wait for Rick's reply; I'll be posting some weight/balance studies that I did on my rig with various implement combos. Front/rear axle loadings, longitudinal c.g.'s for each, ...and some info on figuring such. It will be some time before I have the post ready.

Meanwhile;

Re. vertical c.g.; I saw a reference somewhere to it being about 10-12" higher than the rear axle, for a "normal' tractor WITH ANY LOADS HELD LOW.
My "guesstimate" is that this is fairly accurate, and using it and the tire-track width of your tractor will let you diagram the "theoretical " sideways roll-over angle. This assumes the tractor does not slip sideways, gaining momentum that will tip the tractor when something STOPS the slide, and that no soft dirt or holes(on the downhill side)/bumps(on the uphill side) tilt the tractor further. I t also assumes adequate tire strength/air-pressure so that the now-more heavily loaded "downhill" tires do not distort, lowering that side and causing more tilt.

These(and other) considerations are the reasons that the "theoretical" limit has to be taken with a very big grain-of-salt, when considering how steep a slope to attempt to operate on.

But, ...it IS interesting to picture a tractor mowing sideways on an "ideal" surface and a slope of 40 degrees or so. Interesting AND SCARY! DEFINITELY NOT-RECOMMENDED!

Front/rear- a tractor w/o front ballast is MUCH more likely to flip over BACKWARDS, than forwards. The caution to "TOW only from the drawbar (i.e. from BELOW the rear axle)" should ALWAYS be heeded! This tends to "lever" the front end into-the-ground.

More when I post the weight study.

HTH,

Larry

 

[RBManufacturing]

Re: Safety Tips - Tractor Overturn Hazards

As stated in the past, we use the a.n.s.i. standards as a starting point.
I feel it would be near impossible to give averages for all
tractors, and implement possibilities. Too many variables, as you know.
If you have been on a slope of say 15 degrees, with a brush
hog on rear, and next time you want to travel that slope, with
a fel. Of course you know that you must stay WELL UNDER
that 15 degrees, because of the fel changing center of
gravity. If you have been on a 10 degree slope with fel full
of dirt, and slightly above ground, without any problem,
you can now make an educated estimate of your limits for
this one applicaation. You have used the tiltmeter as a tool
to help determine your limits. Better than no meter, and
guessing, "well I think when I used the brush hog I was on
about a 15 degree slope, and this one looks like about 10
degrees." The meter allows for better determination.
As for a chart, I have the following.
9.46 degrees=6 to 1 grade=17 percent.
11.31 degrees=5 to 1=20 percent.
14.04 degrees=4 to 1=25 percent.
18.43degrees=3 to 1=33 percent.
26.57=2 to 1=50 percent.
45.00degrees=1 to 1=100 percent.
I have a more complete chart if anyone needs it.

Note; 47 state highway depts. use a 3 to 1 grade as their
maximum limit for right of way mowing tractors. They all
use wheel weights, frame weights, or both.
These limits were researched by state and federal engineers
and were arrived at for a standard duty tractor, with rear
brush hog, in lowered position. I deal with highway depts.
on almost a daily basis, and a tiltmeter is a tool they rely
on to HELP in preventing some roll-overs. Of course, some still occur, due to washouts, stumps,operator in-attention, etc.
But EVERY dept. that uses them report fewer roll-overs with
the use of a meter. I can pretty much judge my speed on the
interstate, but if I had never had a speedometer, I probably
would not be able to judge my speed as well.
The a.n.s.i. says a standard duty tractor, static, must meet
20 degree limit side tilt, and 30 degree front to back tilt.
Rick

Rick Hedgecock
R&B Manufacturing
http://www.tiltmeter.com
(816)587-9814

 

[Anonymous Poster]

Re: Safety Tips - Tractor Overturn Hazards

Hi Rick,

Thank you for the followup...

Please post your "full chart" for everyone if it's convenient, I sure others would be interested as well...

I can understand the pitch of a roof, or the angle of an object, but the grade 3 to 1 or 2 to 1 etc., and slope aspects are somewhat confusing... unless some of these terms are "interchangeable"?

Just wondering...

 

[Anonymous Poster]

Re: Safety Tips - Tractor Overturn Hazards

Hi Larry,

It will be interesting to view your study when it's posted.

Thanks.

 

[skent]

Re: Safety Tips - Tractor Overturn Hazards

Received my tiltmeter last friday. holding it in your hand and going to 20 degrees you think to yourself - "that ain't much!".

Mount it to a tractor and try to get to 15. You'll be leaning on the fender when you hit 20.

I'm guessing I wouldn't want my Case DC (tricycle) past 10 degrees!

Might be cool to mount one on a mo-cycle!

Steve

 

[GlueGuy]

Re: Safety Tips - Tractor Overturn Hazards

John,

Maybe a simple graphic is the best way to show this. This little drawing shows the slope as the 6 to 1, etc. ratios, kind of like the terms used for roofs (6 to 1 slope would equate to a "2 in 12" roof, 3 to 1 slope would equate to a "4 in 12" roof). If you'd like, I could re-do this with the slope, grade, and degrees all labled side-by side?

The GlueGuy

 

[Muhammad]

Re: Safety Tips - Tractor Overturn Hazards

Here's what Rick posted back in August, in addition to the figures he posted earlier...

----
%of slope.
1=0.5729 degrees.
2=1.1458
3=1.7184
4=2.2906
5=2.8624
6=3.4336
7=4.0042
8=4.5739
9=5.1428
10=5.7106
11=6.2773
12=6.8428
13=7.4069
14=7.9696
15=8.5307
16=9.0903
17=9.6480-------6 to 1 grade is 9.46 degrees
18=10.2039
19=10.7579
20=11.3099------5 to 1 grade is 11.31 degrees
21=11.8598
21=11.8598
22=12.4074
23=12.9527
24=13.4957
25=14.0362-------4 to 1 grade is 14.04 degrees
26=14.5742
27=15.1095
28=15.6422
29=16.1721
30=16.6992
31=17.2234
32=17.7446
33=18.2628-------3 to 1 grade is 18.43 degrees
34=18.7780
35=19.2900
36=19.7988
37=20.3044
38=20.8067
39=21.3057
40=21.8014
41=22.2936
42=22.7824
43=23.2677
44=23.7494
45=24.2277
46=24.7024
47=25.1735
48=25.6409
49=26.1048
50=26.5650-------2 to 1 grade is 26.57 degrees
100=45.00 degrees and is a 1 to 1 grade.
---

 

[Anonymous Poster]

Re: Safety Tips - Tractor Overturn Hazards

Ok, Ok, Ok.... The light just went ON...

Bill, Thank you! When you equated the roof pitch with the slope..., the same thing, just different terminology! {Or as my brother would put it... the same thing... just different... }/w3tcompact/icons/smile.gif

Muhammad, Thank you for the chart as well...but...

I don't see a 20 degree angle slope on paper to be that big a deal. I keep sidehilling to a minimum... so I'll have to measure a few of these and check.

 

[Anonymous Poster]

Re: Safety Tips -Grade Meter

Making the grade meter
1. Remove the page containing the grade meter from this guide.
2. Cut our grade meter along dotted line.
3. Fold over at dashed line.
4. Cut plywood or board to size of paper below fold.
5. Put glue over the entire back side of paper and attach paper to board.
6. Spray with clear varnish or other waterproofing.
7. Put tack or nail at top center point and attach 15-inch string with nut or bolt on other end. Make sure string swings around nail.

Using the grade meter
1. Sight across top edge to person or object at your eye level. Keep the meter vertical so string hangs straight.
2. When the top edge is lined up, hold string against front and read scale of meter for grade (slope) of road or hill.
3. This meter give a rough measure of grade. For a more exact measurement use an Abney level or clinometer
{from the Web}

 

[RichZ]

Re: Safety Tips - Tractor Overturn Hazards

Bird, I have to thank you, I think you saved my life!!! I used your link, and ordered my tiltmeter. (By the way, they give a $3 discount for TBN memebers). I got the meter in 2 days. I installed it immediately, and went right to a hill on my property that I felt very uncomfortable mowing, I always felt like the tractor was unstable, even though it always handled it. I found out that the slope was over 25% /w3tcompact/icons/shocked.gif!!!! Bird, you once said that if it feels unsafe, it is! Well I should have listened to you, and trusted my instincts. It's a good thing I got the meter before something happened!!!! I now swear by the meters, and have told all my neighbors to get them, because, I've seen them mow and plow much steeper hills than mine. That's why I thought I was overreacting, when I kept feeling it was unsafe. I'm new to farming, but when I told my neighbors about my fears on this hill, they said "Don't worry about it, your old tractor can handle much more than that!" I'm going to talk to them again, and I hope they listen, before something happens. I hope everyone in TBN gets a tilt meter, because its real hard to estimate a slope. I thought mine was about 12%. Turns out it was more than twice that!!!/w3tcompact/icons/shocked.gif Take my advice, your life isn't worth guessing!!! Get a tiltmeter!!!! Thanks, again, Bird!!!!!