Hello,

I have searched the forums however haven't found any applicable results. Basically I need a device which will be able to hld the exact position of a linear bearing on some linear rod(part of a Z axis). Attached is a rough picture of it. I have thought about possibly having a small electromagnet however am not sure how to apply it so that the bearing would keep its exact location on the linear rail. I have seen some devices that have springs and micro electromagnets with friction plates but cost £100 +. The device would have no need to have a holding force more than ~ 20k however the lower the cost the better. Any help regarding this issue would be greatly appreciated.