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Safety, training & legislation

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see saw effect

Number of messages: 18

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ZZJASEZZ
BUCKINGHAMSHIRE, United Kingdom

weight -distance-force

To be honest im not the best at explaining this. If any1 has some info regarding this or links to a site would be gratefull, thanks...

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ITSSAR F.L.T INSTRUCTOR

Modified 20 Jun 2009 04:24 AM
by poster.

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TradeShowDave
California, United States

THE FORKLIFT WORKS ON THE PRINCIPLE OF LOADS BALANCED OVER A FULCRUM.
A SIMPLE EXAMPLE OF A FULCRUM IS A SEE-SAW OR TEETER-TOTTER.
A POINT IN THE EXACT MIDDLE WILL BALANCE THE EQUAL WEIGHTS AT THE ENDS.
THE FULCRUM OF A LOADED TRUCK IS A IMAGINARY VERTICAL LINE THROUGH THE CENTER OF THE DRIVE AXLE HUB.
Not sure if thats where you were going, if I had a marker board I got another couple hours left in me...but then we would all be asleep by then.
Sorry for the shouting, easier to for the old guys that need glasses.

Posted 20 Jun 2009 05:45 AM

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johnr_j
Georgia, United States

A simple explanation might be weight (or mass) acting through a distance (inches, centimeters, etc) creates a force.
Examples:
1.) On a see saw (or teeter-totter) a 100 lb person sitting a 2' from the balance point (or fulcrum) will create a force of 200  lbs.- ft (often and very incorrectly stated as ft-lbs*) match 100 lbs x 2 feet= 200 lb.-ft).  A 50 lb. person sitting at the other end of the see saw sitting at 4 feet from the balance point will create the same force and both persons will be in perfect balance.  The math 50 lbs. x 4" = 200 lbs. ft.
2.) If the 50 ponder moves 6 feet away from the balance point he will create a greater force (or 300 lb.- ft.) and raise the larger person in the air.

* Yes this is a fact.  As they say I are an engineer by degree.  Also, a battery sitting on concrete will not discharge any faster than a battery stored on wood, plastic, cardboard, etc.  They both will discharge at the same rate.  Concrete is not a conductor of electricity but humidity in the air is.  Batteries from little lawn tractor batteries to forklift 1200 am/hr batteries are recommended to be charged at least every 6 months if not put into service to 1.) boost voltage to spec 2.) add water that may have evaporated below the top of the plates 3.) to prevent plate sulfating

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Have An Exceptional Day!

Posted 20 Jun 2009 07:23 AM

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ZZJASEZZ
BUCKINGHAMSHIRE, United Kingdom

re johnr

A 50 lb. person sitting at the other end of the see saw sitting at 4 feet from the balance point will create the same force and both persons will be in perfect balance. The math 50 lbs. x 4" = 200 lbs. ft.
2.) If the 50 ponder moves 6 feet away from the balance point he will create a greater force (or 300 lb.- ft.) and raise the larger person in the air.

This will help thanks...

-------------------------
ITSSAR F.L.T INSTRUCTOR

Posted 21 Jun 2009 08:18 PM

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johnr_j
Georgia, United States

ZZJASEZZ,

As they say "U R Spot On" - Good student - quick learner.

Remember in a lift truck application teh net lift capacity of a unit can be limited by factors other than simple match or ft - in calculations. Items such as: fork limitatations, especially at load centers signifcantly beyond (say beyond 30" load centers) the 20" (500 mm) or 24" (600 mm) load center - often a larger fork section must be used, tilt cylinder limits, carriage bar /roller limits, mast channel limits (especially the flanges), tire capacity limits, hydraulic system, etc These factors can only be determined by the fork lift manufactuer.

Good Training!

-------------------------
Have An Exceptional Day!

Posted 22 Jun 2009 06:11 AM

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ZZJASEZZ
BUCKINGHAMSHIRE, United Kingdom

You`ve lost me there John think i will take onboard your previous post

Posted 22 Jun 2009 06:15 AM

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dan_m
Ontario, Canada

ZZ,

Give me your email address. I will forward you the PowerPoint slides pertaining to the lever principle and how I explain it

Danny

Posted 26 Jun 2009 12:24 AM

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paddyB
Queensland, Australia

Dan,
would it be possible to send me the powerpoint pres as well.
(am i allowed to put my email address on the forum??)
Regards
PAT

Posted 30 Jul 2009 07:41 AM

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chublil
California, United States

Cascades website has a link that calculates any forklifts downrate and takes into account all your variables, (Distance from axle--attachment weight--forklength and slope to tip etc.) Its set up in a formattable Excel form so you can change all the parameters and save it to file on your computer.

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Fix it right!!!

Modified 30 Jul 2009 07:58 AM
by poster.

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edward_t
North Carolina, United States

Pat, you can add your e-mail to your profile, and that way if anyone clicks on the name, they can get your e-mail address (and it keeps "spam harvster bots" from getting your mail by automagically reading the forums).
In order to "get it through the thickness" I always offer up; "Remember on the playground, that if you have a pork-chop kid and stick kid you can put the stick kid right up next to the middle of the teeter-toter and the pork-chop kid at the end" and when they nod in agreement I say "NO, that is exactly wrong, you put the skinny kid on the far out end and the pork-chop kid close to the middle pipe, and we say that as 'weight+distance equals balance or moment', which is 'the principal of balance' which is the way forklifts are designed".

AND, Dan, can you e-mail me that powerpoint too?

My mother wrote advertising so I grew up in a family were we didn't use "Fat" or "Skinny" to describe a person's figure.

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webhome = forktechs.com

Modified 30 Jul 2009 08:06 AM
by poster.

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dan_m
Ontario, Canada

That is you email at the bottom of your comment?

See it!

Try tonight or tomorrow AM with my comments for each slide as I deliver it to my students

Modified 30 Jul 2009 08:26 AM
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dan_m
Ontario, Canada

PADDY,

DONT HAVE UR EMAIL ADDRESS

Posted 30 Jul 2009 02:06 PM

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t_lift
dubai, United Arab Emirates

hey dan would love to have that info...could u please email me at elevadora(at)gmail.com...

cheers

Posted 1 Aug 2009 10:23 PM

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dan_m
Ontario, Canada

Sent.

Posted 1 Aug 2009 11:37 PM

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TC17
Wisconsin, United States

Dan, is it possible to send a copy of the power point to me also, I would like to review it

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Wisconsin, USA "Be safe"

Posted 4 Aug 2009 11:56 PM

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dan_m
Ontario, Canada

Need an email address. Also, this portion of my PowerPoint is not for distribution over the internet, and any use of these slides should be confirmed with me first. Basically, for your eyes only. Thanks.

Posted 5 Aug 2009 00:57 AM

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TC17
Wisconsin, United States

contom@wsinc(dot)com

Thanks

Modified 5 Aug 2009 01:02 AM
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paddyB
Queensland, Australia

Dan,
I’m sorry to have taken sooooooo long to reply but I’ve been flat out like a lizard drinking.

My email address is burnspatb @ yahoo "dot' com "dot" au.
Regards
Pat

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In 20 years time people will regret what they didn't do rather then what then did.

Posted 9 Oct 2009 06:58 AM

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