Keychain / working compliant Robot Gripper (bistable)

Description

This is a fully functional bistable compliant robot gripper for your keychain. In its initial position the gripper is closed, when you push the switch in the middle upwards it snaps into its new position. This opens the gripper. The gripper remains open until you push the switch back into its original position. Its dimensions are approx.: 32 x 35 x 3 mm So far, I haven't needed a robot gripper the size for a keychain on the road, but you never know! :-) Until then, the gripper is a great fidget toy for in between. I hope you have as much fun with it as I did designing it. If you have any ideas or suggestions for improvement, feel free to leave a comment. PS Unfortunately the quality of the gripper in my sample pictures is not optimal, I still need to adjust the settings of my printer a bit more. _________________________________________________________________ I will use this to explain a few features and characteristics of the gripper. I also want to share my reasons for some of the design decisions, so maybe you can give me some useful ideas. If so, please leave a comment or write me a message. 1. I have a printer with a 0.4 mm nozzle, why are my spring elements 0.5 mm thick? I chose this measurement because I had problems slicing it in Cura at 0.4 mm. Everything looked good in the preview but when I printed them they were just left out. I solved this problem by increasing the thickness to 0.5 mm. 2. I added a 1 mm wide bar in the middle of the switch to make it easier to move the switch when the gripper is flat on the table. The bar is 0.5mm high to give some grip but not stick out too far to interfere. 3. The entire gripper is "wrapped" once. This is to protect the individual parts and to prevent the gripper from getting tangled up with other things in your pockets. It is also important for stability. If the casing would not be stable enough, the mechanism would not be bi-stable. 4. The joints for the gripper in the upper part consist of a split and staggered X, also 0.5 mm thick. I chose the thickness for the same reason as in 1. I chose this type of jointsbecause they are quite smooth and the pivot point is somewhat predictable. 5. When the gripper is closed, it should be possible to grip a round object with a diameter of 2 mm. 6. The hole in the corner to attach the gripper to the key ring has a diameter of 4 mm simply because the ring on my key ring has this diameter. If you want or need a different size, just leave a comment or message me :-)

Statistics

Category

Tags