Challenge number 1 - no more loose joints:
All doll owners sooner or later struggle with loos joints. To prevent this joint pressure must be consistent over the joint life. The only way that I can think of to fix this would be to make the joint spring loaded and prevent the washers from wearing down. Hence, lubrication and a spring must be introduced in the design. Below is a schematic picture of a geared knee joint. To add lubrication the red washers can be made from brass metal rater than steel as brass against steel is self lubricating. To add spring loading the pink washer can replaced with a nested wave spring washer which is a type of compact spring. Please XT Doll - try this design and tell us the result
.- Screenshot from 2024-03-17 20-00-45.png (29.38 KiB) Viewed 388 times
Challenge number 2 - heel to butt:
It is not possible for dolls to reach their butt with their heels, the geared skeleton is not flexible enough. Also, the dolls do not have a kneecap so when you bend the knee far enough, the gear pokes out behind the silicone making the knee ugly. One solution to these two problems would be to make the knee joint quadruple geared and to add a plastic kneecap, see picture below. The quadruple gear would increase the distance between the thigh and the chin so the the joint could be bent further than with a regular geared joint. The kneecap is in green in the picture would hide the mechanism, adding realism to the knee. Again, please XT Doll step up to the challenge, test this design and tell us the result
.- Screenshot from 2024-03-17 19-29-31.png (32.51 KiB) Viewed 388 times
