Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides...

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Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the program FPC developed by Caterpillar Equipment Company

Transcript of Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides...

Page 1: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Checking for Tire Heating

©2009 Dr B C PaulNote – These slides contain material from slides dating back to 2000 and also contains screen shots from the program FPC developed by

Caterpillar Equipment Company

Page 2: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Haul Trucks are Very Large

Tires flex and can get hot as a result of working under load

To avoid tire blow-outs we use• Ton Miles Per Hour – TMPH

Each tire has a rating You get the average load *

average speed and compare to the TMPH rating

Page 3: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

FPC Fussing

If you have been doing the things shown in class FPC has been protesting about no TMPH rating and no cost data• (Because up till now we have not

learned about them and have been ignoring the issue)

Page 4: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Go Back to the Fleet Input Screen

Go to the Fleet Input Tab andNote the place for TMPH entry

When you see the little 3 dotBox it means there is aSubscreen for putting in orCalculating more

I’ll click the box

Page 5: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Up Comes the TMPH Screen

Ton Miles Per Hour = (Average load on a tire)*Average Speed

Page 6: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

The Program Automatically Gives You Loaded And Empty

weight Distribution

Page 7: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Well How Do I Get That TMPH Limit Number

The tire specs table inThe Cat handbook

This tells me my789 has 37.00R57 Tires with an E 4 Tread

Page 8: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Checking the Tire Section of the Cat Handbook

Most Manufactures alsoHave similar ratingsFor each of their tires(which is where CatGot the info for theHandbook)

Page 9: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Reading the Table

Average Aggressiveness Tread

535 TMPH per tire

Rating is done at 100 F standard – we are in a hot desert so we willDerate by 25% (manufactures have tables for higher non-standard temp)535*0.75 = 401

Page 10: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Input the Data and click Ok

Page 11: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Go to the Production and Cost Tab and the Tire Temp

subtab

Page 12: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Zooming In

The typical cycle time with delays and operators achieving 95% ofTheoretic potential is 602.66 tmph on the front tires and 483.27 onThe rear.

The numbers are in red because if we run the trucks this way we areGoing to have blow outs

Page 13: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

If You Thought That was bad look what happens with no

delays

Interesting note – notice it is the front tires that overheat first. TheyHave less weight but the back axle has dual wheels. Of course a frontTire blow out is also more likely to cause loss of control (Murphy strikesAgain)

Page 14: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Now What Do You Do?

Your going to have to slow the trucks down• There are several ways of doing this

Page 15: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Jump Back to the Project Screen

People usually don’t work all 8 hours of an 8 hourShift. Typical is 50 minutes/hour or 83%. LetsChange it.

Page 16: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

That Got Our Rear Wheels Under Control

We will still blow out the front tires.

Page 17: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

Limitations and Alternatives

We could always impose a lower shift efficiency• How well do you distribute the time not

working• Shift efficiency often counts time in to the

job site and out at the end of the day – that can still leave a block of time for heat to build in the tires.

• You can force TMPH into bounds with a shift efficiency – but in practice you have to remember to keep your time off distributed (or you will only get rid of blowouts on your computer screen)

Page 18: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

My Trick

Impose speed limits on haul roads• Its easy to enter• But can you enforce it in the field?

Impose a break at the dump point• Raise your dump time to allow for the truck

to be pulled aside to cool the tires after each dump

(Remember what ever you do on computer screen you better be able to do in the field)

Page 19: Checking for Tire Heating ©2009 Dr B C Paul Note – These slides contain material from slides dating back to 2000 and also contains screen shots from the.

My Trick

My enforced tireCool break

My Results