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    Re: Making a mechanical gyro?

    960rpm


    because I'm not interested in the pitch axis data it seems I would be better off using the top image layout
    for the pitch axis, maybe even the roll axis.(use gravity to balance the gyro,...
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    Re: Making a mechanical gyro?

    Plan A

    looks like a us digital encoder that can give me 240000 counts costs $200.00(doable)

    the top shaft is longer for mounting the encoder.


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    Re: Making a mechanical gyro?

    brass stock for flywheel
    7633


    plan A for powering the flywheel

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    Re: Making a mechanical gyro?

    plan A is to build an old school range limited gyro compass.

    pitch limit +/- 90deg.
    roll limit +/- 90deg.
    yaw limit +/- 400deg.

    with a 60mm brass flywheel spinning at 3000rpm.

    they now...
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    Re: Making a mechanical gyro?

    jwatte, I had good results on the bench with mems based IMUs (like an MPU9050) ,the best
    bench results came from the phidgets spatial 3/3/3 (1044_1), but each failed in real world
    applications, the...
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    Re: Making a mechanical gyro?

    with only two weeks until the start of the winter season project (ABS angle senor)
    I'm still conflicted on the best technology to use. seen some good results posted on-line
    with using optical flow...
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    Project Re: More Mule then Rover?

    jwatte, seems like good way to help control temperatures of the alternators, an fuel use.
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    Project Re: More Mule then Rover?

    plan A for remote engine start.

    the engine is going to have it's own arduino nano with a (4)relay shield(because I have one)
    (1) relay contact(NC) for the engine kill control
    (1) relay...
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    Project Re: More Mule then Rover?

    After using the Mule for a few summer/fall season tasks(pulling, and carrying things)
    it is clear I'm going to need to steer the front wheels(tears up the lawn). I got a feeling
    that with the...
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    Project Re: More Mule then Rover?

    jwatte, looks like I don't have to, connected the current meter and tested current
    value without the bucket and doing ZTR (26A), then installed the bucket and did
    the same test(36A), then had next...
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    Project Re: More Mule then Rover?

    first tests of the four wheel drive went sweet!

    I also used the same analog voltage to control both sabertooth drive.

    it was easier to install the motors I got today($70.00 + free shipping from...
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    Project Re: More Mule then Rover?

    while waiting on the front drive motors to get here I have time to work
    on the chains for the front wheels.

    replacing the links with smaller ones in hopes of keeping snow from bouncing
    out of...
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    Project Re: More Mule then Rover?

    jwatte, it's possible with four wheel skid steering that it could drop below the dc/dc cutout
    voltage every time I do a ZRT(takes lots of current).


    because the four drive motors are 500W...
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    Project Re: More Mule then Rover?

    jwatte, that's what I used last winter, but had problem when a high load on the drives
    dropped the 24v too low, and the dc/dc converters shut down causing the cameras to reset.

    not a big problem...
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    Project Re: More Mule then Rover?

    jwatte, I don't get buyers remorse too much anymore, now I just think what's plan B.



    tician, it just got even more under-powered for this build, the documentation for the engine
    lists the...
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    Project Re: More Mule then Rover?

    found a small briggs engine with 12vdc starter motor on craigslist for $100 to power the 24Vdc 100A alternator for the mule.


    started first try and doesn't smoke (sweet!)

    seems to be a 1982...
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    Project Re: More Mule then Rover?

    not even going to try it...

    if I could pick the mule up and bring it back home if it fails when it's dark and -20degf outside
    then it would be worth looking at. but I currently can't.

    having...
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    Project Re: More Mule then Rover?

    gotta wonder....
    this season's task was a standup mower using (2) 4 pole 1000W servo motors(mowing 2 acres a week).

    the frame used was a commercial 48" brand(gravely) that weighed 300lb alone,...
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    Project Re: More Mule then Rover?

    more baby steps.

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    Project Re: More Mule then Rover?

    jwatte, not this season, but next summer it is.

    this problem became obvious the first season's build(mowing), the first build used open-loop
    control of the drive motors which ended up creating...
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    Project Re: More Mule then Rover?

    jwatte, difference between Sabertooth 2x32 and the Sabertooth 2x60 is more about convenience to me.
    with the 2x60 a max232 chip and pc software(describe) are needed to set things like current...
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    Project Re: More Mule then Rover?

    jwatte, I'm wondering that also.

    with the front motors not connected to the front wheels turning is a battery sucking operation
    with these fat wheels on pavement and the bucket installed. should...
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    Project Re: More Mule then Rover?

    more baby steps on way to four wheel drive.

    7596
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    Project Re: More Mule then Rover?

    I was wondering how the linear guides wound hold up in the harsh wisconsin
    environment.

    image below is after one winter.

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    Project Re: More Mule then Rover?

    I do get this is a deadhorse type topic, but.

    I got big plans for the mule this fall and winter.

    the picture in my head for this next build(all wheel drive) has changed from
    just last winter....
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    Re: The task (lawn mower topic)

    jwatte, lucky for me I got all that kind of stuff out of my system as a youth.
    my first job in electronics back in the mid 70's was fixing radar guided missiles for the army, so now I think ...
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    Re: The task (lawn mower topic)

    jwatte, I was thinking more like big 110vac inverter for backup power for when the lights go out, or a 110vac weed wacker.

    but, lidar looks like something that would be fun to play with.
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    Re: The task (lawn mower topic)

    jwatte, seems it tops out at 190F with heavy mowing, hilly terrain. when on flat blacktop 175F.

    the only problem with having unlimited batteries, is you then end up adding things like computers,...
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    Re: The task (lawn mower topic)

    after 3 hours run time with outside temperature of 80degf, Alternator temperature 190degf, right motor 120degf, left motor 135degf, servo drive 100degf.
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    Re: The task (lawn mower topic)

    Sweet! new 100A alternator is charging batteries again.

    for no other reason then to test the blowers for controlling the temperature that
    the alternator operates at, I got the same type...
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    Re: The task (lawn mower topic)

    Thinking the alternator in the image below with it's fan internal may keep
    cooler with 500+ cfm of air movement then the enclosed type I tried first.

    maybe.

    today the outside temps reached...
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    Re: The task (lawn mower topic)

    Crap, the alternator is at 85degf while mower is running, and batteries lasted 30min. ,
    that means alternator is cooked.
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    Re: The task (lawn mower topic)

    with the blower running the servo motors are operating about 30degf cooler.
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    Re: The task (lawn mower topic)

    I may have found the issue with the alternator, it seems these are single wire devices,
    that self excite, but I wired the excite input to 24vdc when the engine is running.

    that could over ride...
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    Re: The task (lawn mower topic)

    Jwatte, I have room to mount a second blower on the other side, that would
    give me 540cfm of air on the alternator and woulds only cost 6amps of power at 24vdc.

    I don't know if the high heat is...
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    Re: The task (lawn mower topic)

    I should now be able to test to see if moving 270cfm of air across the alternator
    can control the temperature it operates at.

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    Re: The task (lawn mower topic)

    while I picked this task because I was thinking it would go fast(faster then most tasks I pick)(some last years).
    so I'd have time to finish the four wheel drive system on the mule before winter...
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    Re: The task (lawn mower topic)

    EdZachery, you are correct about it being heart of the mowing season, but now
    I'm dealing with the heat of the mowing season, as it turns out alternators get
    damn hot. I installed a temperature...
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    Re: The task (lawn mower topic)

    with the alternator installed and charging the batteries, this task is almost
    complete(just need to clean up wiring and make covers for the batteries) .

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    Making a mechanical gyro?

    I understand I could get a laser ring gyro for around $2000, but back in the 1970's
    I worked on a missile system in the army that used a analog mechanical gyro that
    was caged at a fixed angle when...
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