A clamp apparatus for connection to a miter saw includes a shaft and a carriage assembly. The carriage assembly is slidably coupled to the shaft. The carriage assembly includes a carriage body, a first camp assembly, and a second clamp assembly. The first clamp assembly is configured for movement relative to the carriage body between a first clamp position and a second clamp position. The first clamp assembly is further configured (i) to enable movement of the carriage body relative to the shaft when the first clamp assembly is in the first clamp position and (ii) to prevent movement of the carriage body relative to the shaft when the first clamp assembly is in the second clamp position. The second clamp assembly is configured for movement relative to the carriage body between a third camp position and a fourth clamp position.