What can you NOT accomplish with common threaded bolts? Explain why! a. You have a bolt with a 7-13 UNC thread What is the approximate pitch of the thread? Express the pitch in both standard and metric units!
With common threaded bolts, there are certain limitations and tasks that cannot be accomplished efficiently or effectively due to the nature of these bolts. Here are a few examples:
1. Fine adjustments: Common threaded bolts have a coarse pitch, which means the distance between consecutive threads is relatively larger. This coarse pitch makes fine adjustments difficult to achieve, as it restricts the degree of precision in positioning or tightening objects.
2. High torque applications: Common threaded bolts are not designed for high torque applications. They are more suitable for low to medium torque requirements. Applying excessive torque to these bolts can result in them stripping or breaking due to their limited strength and holding capability.
3. Rotational movement: While threaded bolts are excellent for fastening two or more objects together, they are not efficient in providing rotational movement. Due to the thread design, rotational movement can be uneven, resulting in jerky or imprecise motion. For rotational applications, alternative mechanisms like gears or bearings are more suitable.
Now, let's determine the approximate pitch of the thread with a 7-13 UNC bolt:
The second number in the 7-13 UNC thread specification represents the number of threads per inch. Therefore, a 7-13 UNC bolt has 13 threads per inch.
To express the pitch in metric units, we need to convert inches to millimeters. As 1 inch is approximately equal to 25.4 millimeters, the pitch of a 7-13 UNC thread is approximately 1.854 mm (25.4 mm divided by 13 threads).