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<DIV>That is the equivalent of what I just commented on regarding dual front
wheels. With the roll-a-matic, the pivot point really is in the center
(effectively about the same as a single front wheel).</DIV>
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<DIV>Jim Becker</DIV>
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<DIV style="font-color: black"><B>From:</B> <A
title=robinson46176@gmail.com>Indiana Robinson</A> </DIV>
<DIV><B>Sent:</B> Monday, September 02, 2019 1:06 PM</DIV>
<DIV><B>To:</B> <A title=at@lists.antique-tractor.com>Antique Tractor Email
Discussion Group</A> </DIV>
<DIV><B>Subject:</B> Re: [AT] Tractor safety</DIV></DIV></DIV>
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<DIV>I still have a John Deere A and while I was still farming my last primary
tillage tractor was a Deere 4020. Both were narrow front with Roll-a-matic. I
often wondered if the Roll-a-matic would have an effect on side stability even
if extremely minor. If, say the tractor was leaning down hill to the right
the down hill tire would be able to lift and at the same time the up hill tire
would be pushing down placing a slight lift to the up hill side. Minor I know
but when nearing the actual tip point you can about push one over with one hand.
The NF on that 4020 was about 2' wide.</DIV>
<DIV>All of my other NF's (AC-C, WC, Farmall's, Case, MM etc.) are all rigid as
you would expect.</DIV>
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<DIV>.<BR></DIV></DIV>
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<DIV class=gmail_attr dir=ltr>On Mon, Sep 2, 2019 at 12:21 PM James Peck
<<A>jamesgpeck@hotmail.com</A>> wrote:<BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">My
childhood friend turned over a NF JD A in his early teens while plowing on
flat ground. The issue was turning too fast. It went on its side but did not
roll over.<BR><BR>[<A target=_blank>szabelski@wildblue.net</A>] Under
identical conditions, and with the same rear wheel spacing and weight
distribution, identical WFE and NFE tractors will have different roll over
characteristics. The reason is that in order for a tractor to roll over there
has to be a rotational moment applied. The rotational moment occurs as one of
the rear wheels comes off of the ground. <BR><BR>Now consider a man standing
on two legs and somebody pushes him from the side at his shoulder. At the time
of the push a rotational moment is being applied to his shoulder, trying to
tip him over. One of his feet may come off of the ground, but he should be
able to stay standing.<BR><BR>Now consider the same man standing on one leg
and the same push is applied to his shoulder. He’s going to have a harder time
staying upright.<BR><BR>If you could find some people who would be willing to
test their tractors on a tilt bed, and who had the necessary parts to change
their WFE to a NFE (I know that older Farmalls can be switched between WFE and
NFE with some simple bolting work) you could get all the data you need to put
this issue to bed.<BR><BR>You could attach strain gauges to the safety
chains/cables of the test bed and determine the amount of rotational moment it
takes to cause a specific tractor to roll. It would be nice to get a variety
of tractor types and sizes to see how tractor manufacturer/size affects the
the rolling over
concern.<BR>_______________________________________________<BR>AT mailing
list<BR><A target=_blank>AT@lists.antique-tractor.com</A><BR><A
href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com"
rel=noreferrer
target=_blank>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</A><BR></BLOCKQUOTE></DIV><BR
clear=all><BR>-- <BR>
<DIV class=gmail_signature dir=ltr>
<DIV dir=ltr>
<DIV>-- <BR><BR>Francis Robinson<BR>aka "farmer"<BR>Central Indiana USA<BR><A
target=_blank>robinson46176@gmail.com</A><BR><BR><BR><BR><BR><BR><BR><BR><BR></DIV></DIV></DIV>
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