An analysis of the uncertainty value of measuring spur gear dimensions using a profile projector has been carried out. Dimensions of spur gears measured are pitch diameter, root diameter and outside diameter. The manufacture of 3 samples of spur gears was first made with a shape milling machine based on the initial technical data that had been determined. Then measurements were made with a profile projector measuring instrument for the three measuring dimensions, the best repeated measurement average was found in the root diameter measurement for the PJ01 sample of 32.4053 mm with a standard deviation of 0.0077 mm. The uncertainty method used is statistically and applies only to a series of observations. Determination of the uncertainty value is done by performing repeated measurements five times on the same sample. This method refers to ISO GUM with type A evaluation. The uncertainty value obtained for the best measurement is 0.0034 mm with an expanded uncertainty of 0.0068 mm with a 95% confidence level.

Banjarwaru Village known as bamboo crafts village. Originally it was just a household product, it began to develop into a product that has aesthetic value. Sales of handicraft products are also starting to grow, they are starting to spread to other areas. Then the problem arises, namely inconsistent sales levels. To overcome this problem, the Cilacap State Polytechnic carried out Community Service activities by conducting Focus Group Discussion (FGD) activities by inviting resource persons from business actors to discuss with Banjarwaru village craftsmen. The aim of this activity is that Banjarwaru village craftsmen can find solutions to increase the level of sales of their craft products. From the results of the FGD, it was found that steps that can be taken to increase sales levels are carrying out business legality, building networks with the government, consumers, and fellow business actors, and increasing promotions through digital platforms.