2. Obtaining Moving Cycle Times ©Dr. B. C. Paul 2000 revised 2008 Note – The methods shown in these slides are adapted to use FPC, a program produced by Caterpillar Equipment Company from which several screen shots are taken.

3. Getting Times on Road Segments l With Distance and Average Speed known it is a simple calculation to get time to travel a road segment. l Formula Distance (ft) / (mph * 88) = time in minutes for segment l 550 / (19 * 88) = 0.33 minutes

4. Doing Cycle Times with FPC Go to the select tab Pick the combinations Of courses and fleets You want (your production may Come from different Benches and your ore And waste fleet could Be different) I picked my hydraulic front shovels loading My trucks

5. Go to the Production and Cost Tab Select what you Want to review from The select sub-tab I already have just One selection

6. Pick Cycle Time Subtab No results yet – it still Needs info from me. Specifically it wants To know how long it Will take for my Truck to dump and Maneuver.

7. Caterpillar Performance Handbook suggests About 1 to 1.2 minutes Is typical (I could do time studies) I’m going to try 1.1 minutes

8. When I put it in I get my First Estimates Of course there are Some things like 6.43 passes and Filling to 129% of Volume limit that Make no sense

9. Update with 5 Pass Loading Now I have results 100% of volume Capacity 132 tons of load

10. Look at My Cycle My 20 minute cycle time guess Was not too hot I’m spending 5 minutes waiting To load

11. Other Output Screens I only need about 1,100 Hours to meet Production I could do that in just 0.62 years Or I could produce Close to 9,000,000 Per year Look at Fleet Production Sub-Tab

12. I Can Look at Haul and Return Speeds In a graph under speed Graph submenu Or in a table under Haul and Return

13. Because my Cycle Time Guess was bad my fleet is the wrong size Fleet size sub-tab Gives me info On how many Trucks are needed With 2 loaders I Can get to 5 Million tons with 6 trucks

14. Part of the Process of Design l We often do calculations that require information we don’t have We break the log-jam by guessing something Calculations subsequently loop around give us a chance check and adjust our guess.

15. Output of What Trucks Produce Above about 6 trucks we are only filling in idle time on loaders Caused by bunching

16. Checking My Loader Ratio l My Loader time is 2.67 minutes l My theoretical cycle with no waiting is 8.81 minutes l 8.81/2.67 = 3.3 l A loader can handle about 3 trucks l I will adjust to 6 trucks – 3 loaders

17. I Jump Back to the Fleet Input Screen I will change the Number of trucks For fleet #2 to 6

18. Check My New Cycle Time Ten minutes – I still have a wait Due to bunching.

19. My Adjusted Fleet Production is Good Of course I could Now go back and Adjust my other Fleets as well.