Hi Folks.
I have a problem I am trying to solve.
I need to make a 10 turn micro winch. It will not be pulling much so strenght is not an issue. And I have several design possibilities and need some input.
1. Take a 9gram servo and replace its pot with a multiturn unit. Its fiddly, I can do it however I am concerned that multi turn trimpots will not have the durability.
2. Use a 3.5inch diskdrive stepping motor. Easy to get hold of however getting the position of the motor will be messy. 2 ways I can see on this is
a. Micro rotary encoder
b. 'markers' on the pulley wire so that it knows max and min extension and can then 'guesstimate' position from one of those poines. i.e. startup - fully extend pulley and thenback up 3.5 turns - remembering position.
Many thanks
Dave
I have a problem I am trying to solve.
I need to make a 10 turn micro winch. It will not be pulling much so strenght is not an issue. And I have several design possibilities and need some input.
1. Take a 9gram servo and replace its pot with a multiturn unit. Its fiddly, I can do it however I am concerned that multi turn trimpots will not have the durability.
2. Use a 3.5inch diskdrive stepping motor. Easy to get hold of however getting the position of the motor will be messy. 2 ways I can see on this is
a. Micro rotary encoder
b. 'markers' on the pulley wire so that it knows max and min extension and can then 'guesstimate' position from one of those poines. i.e. startup - fully extend pulley and thenback up 3.5 turns - remembering position.
Many thanks
Dave