Hello everybody,
I believe that I will find experts here who have already solved a similar topic. I need to calculate the length of the wire/cable via proximity sensor. I used a proximity sensor because it has to be placed inside of the machine and there is no physical space for the encoder. The sensor can give 20 pulses for 1 revolution and it measure pulses from pulley's rotation with diameter D1 (in the attachment). The wire/cable has a very tight grip on the pulleys since they are wrapped three times.(same shaft, three pulleys behind each other firmly connected) so no slip at all.
The one thing I am not sure, is that I probably need to take account the cable/wire diameter for the best/ better result. If I want to calcute the lenght/distance of the cable axis /center of the cable I need to add half of the measured cable diameter?(D1+D2/2)
Because if I have for example 6000 revolutions (120 000 pulses) for one production cycle and D1 =0,318319 m so the pulley circumference is 1m.
Total lenght without taking account the wire diameter is 6000* bare pulleys circumference= 6000m
if i take account the wire diameter for example 8 mm the center of the wire traveled 6000*(bare pulleys circumference+0,5*wire diameter)=6075m
the difference is quitebig. The wire diameter may vary (different production different wire diameter.) My question is if my idea is right or complete bull**it.
If you have any other ideas please share, I hope my description is sufficient enough. In the attachment there is a sketch of the pulley
s.
Thank you
I believe that I will find experts here who have already solved a similar topic. I need to calculate the length of the wire/cable via proximity sensor. I used a proximity sensor because it has to be placed inside of the machine and there is no physical space for the encoder. The sensor can give 20 pulses for 1 revolution and it measure pulses from pulley's rotation with diameter D1 (in the attachment). The wire/cable has a very tight grip on the pulleys since they are wrapped three times.(same shaft, three pulleys behind each other firmly connected) so no slip at all.
The one thing I am not sure, is that I probably need to take account the cable/wire diameter for the best/ better result. If I want to calcute the lenght/distance of the cable axis /center of the cable I need to add half of the measured cable diameter?(D1+D2/2)
Because if I have for example 6000 revolutions (120 000 pulses) for one production cycle and D1 =0,318319 m so the pulley circumference is 1m.
Total lenght without taking account the wire diameter is 6000* bare pulleys circumference= 6000m
if i take account the wire diameter for example 8 mm the center of the wire traveled 6000*(bare pulleys circumference+0,5*wire diameter)=6075m
the difference is quitebig. The wire diameter may vary (different production different wire diameter.) My question is if my idea is right or complete bull**it.
If you have any other ideas please share, I hope my description is sufficient enough. In the attachment there is a sketch of the pulley
s.
Thank you