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ELECTRIC PRUNER

After the initial design, analysis, and construction of the frist pruner prototype, various tests were performed to test whether the device was successful with regard to the requirements of the entire pruner. The various tests, testing parameters, and test results are listed below:

Test 1: Branch Cut Rate

Requirement: The pruner must be able to cut 250 7/8" to 1" diameter branches per hour.

Test: In order to test this requirement, the device was used to cut 10 7/8" to 1" diameter branches. The time for the device to make 10 cuts was recorded. From this data it could be determined how many cuts the pruner could make in 1 hour.

Test Results: From the test data, it was determined that the pruner device was capable of making approixmatley 720 cuts per hour. This exceeds the required cutting rate by 280%.

Test 2: Cut Cycle Time

Requirement: The device must be capable of performing a complete cut cycle within 2 seconds. A complete cut cycle is defined as the pruner blade moving from the fully opened position, to fully closed, and returning to the fully opened position.

Test: In order to test this device requirement, the device performed a cut on a branch and the cut cycle time was recorded using a stopwatch.

Test Results: After recording the duration of three cutting cycles, the average cutting cycle of the pruner was determined to be 1.94 seconds. This exceeds our requirement by 103%.

Test 3: Weight Testing

Requirement: The total device weight must be no greater than 10 lbs.

Test: To test this device requirement, the pruner was place on a scale and the weight was recorded.

Test Results: The total weight of the complete pruner device is 7.95