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    row row row your boat
    by jacko πŸ‡¬πŸ‡§ ( Chief Petty Officer 1st Class)
    πŸ“£










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    7 Posts 30 Comments 0 Photos 26 Likes
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    πŸ“ twin servos
    4 days ago by jacko ( Chief Petty Officer 1st Class)
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    now looking at running 2 servos on continuous rotating but having trouble sinking then any help out there i am using 2 x 9g servos, so the row boat can turn ????

    9g servos
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    πŸ’¬ Re: twin servos
    4 days ago by Graham93 ( Petty Officer 1st Class)
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    jacko,

    Very difficult to synchronise two continuous rotating servos. They will almost certainly run at slightly different speeds due to friction, manufacturing differences etc. Even if they run at the same speed, tiny changes in loading on each oar for example will change their speed and knock them out of step. There are lots of videos on YouTube showing rowing mechanisms. With a continual rotating servo, the solution seems to be to use one, and then have a separate servo to adjust the drive to each oar, using a clutch as in the attached YouTube example. Trying to sync two continual rotating servos is really tricky. It would need sensors on each servo to measure their relative positions, and then some control unit using these sensors to keep the servos in step.

    Other solutions use normal servos for each oar, and use some control electronics to drive them both in sync, or out of sync when turning. This is the approach I plan to use.

    Regards
    Graham
    RC ROWBOAT MECHA
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    πŸ’¬ Re: twin servos
    3 days ago by Martin555 ( Commodore)
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    Very clever system,
    Work extremely well, one if the best i have seen.

    Martin555.
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    πŸ’¬ Re: twin servos
    3 days ago by Graham93 ( Petty Officer 1st Class)
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    Martin,

    It is a clever solution. I feel I should just point out, just to avoid any confusion, that I didn’t build it. It’s simply a video I found on YouTube.

    Regards
    Graham
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    πŸ’¬ Re: twin servos
    2 days ago by jacko ( Chief Petty Officer 1st Class)
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    wow thanks so this is the one i need to make

    again thanks
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    πŸ“ test
    9 days ago by jacko ( Chief Petty Officer 1st Class)
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    sides trim'd down varnished 4 coats
    Monday is on the water test so hopefully all will be well will post video work or fail it will be show'n

    only managed to get a 4 second film it worked
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    πŸ’¬ Re: test
    8 days ago by Martin555 ( Commodore)
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    I am looking forward to seeing the results Jacko.

    Martin555.
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    πŸ“ row boat
    24 days ago by jacko ( Chief Petty Officer 1st Class)
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    now the sides have been added waiting for the glue to dry

    then to trim down to size
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    πŸ“ it sort of works
    26 days ago by jacko ( Chief Petty Officer 1st Class)
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    well what can i say it sort of works with a bit of fiddling lets see

    then the crew arrived ! ! ! !
    20190918 2042141
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    πŸ’¬ Re: it sort of works
    26 days ago by Martin555 ( Commodore)
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    Very good, there is a lot more involved in it than you think.
    You are doing a great job.
    Well done.

    Martin555.
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    πŸ’¬ Re: it sort of works
    25 days ago by figtree7nts ( Rear Admiral)
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    Hi Jacko,

    Excellent work!

    I have a crew of Minions as well.
    But there still in the package!

    I haven't found the right boat for them yet!😁

    Cheers, Ed
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    πŸ’¬ Re: it sort of works
    25 days ago by jbkiwi ( Captain)
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    Looks to be working perfectly!
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    πŸ’¬ Re: it sort of works
    25 days ago by MouldBuilder ( Sub-Lieutenant)
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    That is very clever. Very smooth.πŸ‘
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    πŸ’¬ Re: it sort of works
    25 days ago by Graham93 ( Petty Officer 1st Class)
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    Looks great!!
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    πŸ’¬ Re: it sort of works
    22 days ago by mturpin013 ( Lieutenant)
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    "well what can i say it sort of works" that an under statement, its brilliant.
    What we need now are some detailed drawing so we can all have a go. please.
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    πŸ“ test
    28 days ago by jacko ( Chief Petty Officer 1st Class)
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    test rig with servo
    test rig servo
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    πŸ’¬ Re: test
    28 days ago by Graham93 ( Petty Officer 1st Class)
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    That looks encouraging. Motion of the oar looks realistic (to my untrained eye - not being a rower!). I think the difficulty will be to get two oars doing the same thing in sync - or out of sync if you want to make a turn.

    A single servo driving both oars like that would work, but then how do you turn? Two separate servos, one for each oar would allow turns, but will be very difficult to keep in sync when rowing in a straight line.
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    πŸ’¬ Re: test
    27 days ago by jacko ( Chief Petty Officer 1st Class)
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    think a 2nd servo for a rudder looks the best thing i can do
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    πŸ’¬ Re: test
    27 days ago by mturpin013 ( Lieutenant)
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    Question from a non-electronics - how do you get the servo to rotate continuously?
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    πŸ’¬ Re: test
    27 days ago by jacko ( Chief Petty Officer 1st Class)
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    hi mturpin013 there are plenty of ways to do it look at ytube for 9g servo continuous rotation🀞
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    πŸ’¬ Re: test
    27 days ago by RNinMunich ( Fleet Admiral)
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    Hi Jacko,
    "there are plenty of ways to do it look at ytube for 9g servo continuous rotation🀞 "
    It would be extremely helpful if you Could post some appropriate links with such a post!πŸ˜‰
    Cheers, Doug 😎
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    πŸ’¬ Re: test
    25 days ago by figtree7nts ( Rear Admiral)
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    Hi Michael,

    Take a look at this:

    https://www.robotshop.com/en/9g-continuous-rotation-micro-se...

    Cheers, Ed
    https://www.robotshop.com/en/9g-continuous-rotation-micro-servo.html
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    πŸ’¬ Re: test
    25 days ago by Martin555 ( Commodore)
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    Hi Ed,
    If Michel has a few spare 9g servos he could always try this.

    https://youtu.be/zZGkkzMBL28

    Martin555.
    https://youtu.be/zZGkkzMBL28
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    πŸ“ row boat
    28 days ago by jacko ( Chief Petty Officer 1st Class)
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    been thinking over the last days of powering the oars moving the oar to the end of the shaft or powering both oars from a single shaft on the centre line or combine both so oars to end powered by a single shaft more to follow
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    πŸ’¬ Re: row boat
    28 days ago by Martin555 ( Commodore)
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    I think that the oars should be totally independently driven to aid with steering.

    Martin555.
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    πŸ’¬ Re: row boat
    28 days ago by jacko ( Chief Petty Officer 1st Class)
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    was thinking of adding a rudder
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    πŸ’¬ Re: row boat
    28 days ago by Graham93 ( Petty Officer 1st Class)
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    There are quite a few mechanisms demonstrated on utube.

    My plan is to build something similar to this one.
    Model Rowing Boat Internal Mechanism
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    πŸ’¬ Re: row boat
    28 days ago by jacko ( Chief Petty Officer 1st Class)
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    been trying to get 2 servos working at the same speed this i have been unable to do even down to using end points still unable to do this
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    πŸ’¬ Re: row boat
    28 days ago by Martin555 ( Commodore)
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    Hi Graham,
    That is excellent, it must of taken a lot of thinking about.
    Extremely well done.

    Martin555.
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    πŸ’¬ Re: row boat
    25 days ago by figtree7nts ( Rear Admiral)
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    Now that's Fantastic!
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    πŸ“ row row row your boat
    30 days ago by jacko ( Chief Petty Officer 1st Class)
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    just a start of a rowing boat challenge sorry for the mishaps but the last one worked this is a test rig to see if i can make one πŸ˜€πŸ˜€ lest hope it do not go 😭😭
    20190914 220716
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    πŸ’¬ Re: row row row your boat
    30 days ago by jacko ( Chief Petty Officer 1st Class)
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    if you can help with other ideas please do
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    πŸ’¬ Re: row row row your boat
    29 days ago by Martin555 ( Commodore)
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    Hi jacko,
    It might be worth looking on utube, I have seen some rowing mechanisms on there.

    Martin555.
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    πŸ’¬ Re: row row row your boat
    29 days ago by Graham93 ( Petty Officer 1st Class)
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    Great start! Very interested to see how this develops as I hope to build a rowboat over the winter.
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    πŸ’¬ Re: row row row your boat
    29 days ago by Martin555 ( Commodore)
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    Hi jacko ,
    I have just had another thought.
    If you modified a servo to rotate continuously and adjusted the pot for the speed that you want.
    It will make it easier for you when fitted to your test rig.

    Martin555.

    pot
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    πŸ’¬ Re: row row row your boat
    29 days ago by MouldBuilder ( Sub-Lieutenant)
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    How about a geared 6 volt motor running a cam. These motors can go down to as little as 14rpm and are very small.

    motors
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    πŸ’¬ Re: row row row your boat
    29 days ago by redpmg ( Midshipman)
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    Have a plan somewhere for a rubber band powered one - worked well - made a few to give away . Might be able to work out a mechanism from that
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