Nt1310 Unit 6 Lab Report

Pour 5 mL of water into the graduated cylinder. Weigh and record the mass of the cylinder and water.

Grzegorz Krajewski and Adam Wo´zniak proposed a method to determine dynamic error of CMM by scanning simple shape master artifact. The artifact is assembly of two flat plates with provision to adjust the angle between the plates. The experiment is carried out on ZEISS ACCURA Bridge CMM with VAST XXT (Passive) scanning probe and VAST Gold (Active) scanning probe. The dynamic error is determined by scanning the plate parallel to the scan axis first then the plate inclined at some angle. The sudden change in direction causes acceleration which leads to dynamic errors. At high scanning speed, the dynamic error is more in passive probe than active probe. The proposed method can also use for optimization of measurement process.

Increase the length of string by about 15cm and measure the total length of the string. Record this length in the data table. Repeat this step along with steps 5-7 nine more times.

1. Why is it important for the ring to be at the center? Since the mass hangers have equal masses, can you disregard them in the experiment? Why?

A known mass was compared with an unknown mass with the use of the balance principle. With the meter stick on the support stand the unknown mass (m1) was suspended near one end of the meter stick while the other stick was suspended with m2. Until the meter stick was in balance its position was adjusted. The unknown mass was then removed in which the actual mass was then determined by using a laboratory balance.

To do the experiment I will set up the apparatus first. I will firstly place the tripod on top of the base of the clamp stand and fill the 300ml beaker with 250ml of water to create the water bath. I will place the boss in the middle of the bar on the clamp stand and place the clamp in the boss. I

Prepare the specimen as specified above. Place the specimen in the position clamped it upright in an anvil (vertically) , with a V notch at the level of the top of the clampfacing the striker (Pendulum). Now record the initial height. Remove the pendulum which is allowed to fall freely to strike the specimen with a specified energy. Now use the data points for further calculations.

7. After recording all values reduce the load to zero by rotating clockwise. 8. Using the values of strain for 500N load calculate their equivalent member forces and record them in table 3 using the following equations :

Use (4) to compute m4 and place this amount of mass on the fourth string. Check that the ring is centered.

The Computer and sensor calibration along with equipment such as DIN plug, force sensor, rod, clamp, spring, sensor’s hook, and hanger were all set up already in the laboratory before we started doing the experiment.

As shown in the figure above, it is necessary to measure the displacement of the comb, and thus wise to establish an equilibrium position. In the example above, the 27th tooth is being used as the equilibrium position; however, for this experiment, the 31st tooth was used as the equilibrium position, or rather the position with zero displacement. In addition, the photogate sensor was placed just to the right of the 31st tooth, as to begin in the unblocked position. Therefore to start the experiment, the comb was to be pulled to the right, just beyond the photogate sensor, and the motion would be directed to the left.

Force uncertainty: The least count of the Newton meter that I used is 0.25N. Although the interspace of each scale is wide enough for me to determine, I was not able to control the tension force which I act on the Newton meter. This created the uncertainty of the force measurement. By noticing the fluctuation of the indicator, I estimate the uncertainty of the force is about 0.05N.

After using equation 1 to find the experimental moment of inertia, the average and standard deviation of the five trials for No Ring and Ring were calculated using Excel commands for average and standard deviation. The averages will be used later on in order to calculate the experimental moment of inertia for the ring.

7. The horizontal weight is moved 10 mm to the right and the angle of tilt of the thread is recorded.

If it is possible, maximize the deflection on the SWR-meter by using the method outlined in the basic instructions.