Batik is a painting or drawing on mori fabric that is made with canting tools. In Subsequent developments to speed up the process, stamp batik is used. CNC (Computer Numerical Control) based automatic stamp batik machine has been developed. This machine uses a manual batik stamper in the batik stamp (tool). The problem that arises in the use of manual chucking on this automatic stamp batik machine is the amount of time needed in the replacement and setting of the batik stamp. The design of a CNC based automatic batik machine with automatic gripper has been developed. This automatic gripper combined with the CNC based automatic stamp batik machine is programmed using a combination of G-Code for the CNC and ladder diagram for the PLC (Programmable Logic Control). Based on the design that has been applied to batik stamps produced stamping that is more consistent and has better accuracy than manual stamping. The average difference in wax thickness is 0,003 mm and has 75 seconds slower than manual stamping. This means that even though the automatic gripper provides better accuracy and precision, it sacrifices stamping times.

Each material has different electrical characteristics. One of the electrical characters of materials is impedance. This characteristic used to specify the components of the material. To determine the impedance value of materials frequently used method is the injection of current through a pair of electrodes. This study will make effective electrode designs. The electrode designs used are circular with 1mm, 5mm, and 15mm diameter variations, with 3mm, 7mm, and 11mm configurations. The electrode material used is a copper plate (PCB). The results of the graph on mineral water show that the 11mm configuration produces a logarithmic graph. This result is due to the total impedance of mineral water affected by the resistance component and capacitance at the electrode. The measurement of sugar solution shows that 5mm diameter is more sensitive than 15mm diameter. Then the effective electrode design for impedance measurement is 5mm diameter with an 11mm configuration.