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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.

    7600

    7601

    7602

    7603
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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.

    7594
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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.

    7565

    7566

    7567
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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) .

    7555

    7556

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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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    Re: The task (lawn mower topic)

    Jwatte , I do hope they work better then the two position switches I got from Amazon also,
    which failed (sometimes worked, sometimes not)
    hard to complain when you buy 5 for 12.00 and free...
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    Re: The task (lawn mower topic)

    this season's build is a little different.

    while driving around chicago I noticed people using stand up lawn mowers,
    to find out why, what's the benefit I could have stopped and asked, but that's...
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    Project Re: More Mule then Rover?

    the bucket also makes changing mower blades easier.

    7468

    7469
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    Project Re: More Mule then Rover?

    I just looked up and noticed that it's march.
    time to turn attention to mowing, big build this season for dealing with grass.

    Lots of fun this winter! looking forwards to next winter.
    the bucket...
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    Project Re: More Mule then Rover?

    I'm also not happy with the bracket design when used with the bigger motors.

    these bigger motors have OEM mounting holes (6-M6 tapped holes), but I added
    (8) 10-32 tapped holes to be able used...
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    Project Re: More Mule then Rover?

    jwatte, the current motor bracket is made from 2pc .5" x 2.5" 6061 aluminium plate.
    the plates are bolted together by (4) 1/4-20 SHCS (grade 8) .
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    Project Re: More Mule then Rover?

    7461

    the flexing of this aluminum bracket is due to
    the 6" distance between the mounting bolts and
    the chain sprocket.

    7462

    it could be minimized with a gusset added.
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    Project Re: More Mule then Rover?

    With the bigger motor it's pointing up and is visible in the camera facing
    down on the bucket attachments.

    when I get back to Wisconsin Sunday I'll post video of it bouncing around

    this week...
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    Project Re: More Mule then Rover?

    I would like to try to make the lifting frame out of aluminum and 10" more travel

    but all the brackets out of steel

    breaking up ice on the streets is very hard work on the mules

    also it...
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    Project Re: More Mule then Rover?

    My concern is not some much that the bracket
    could fail, but that it could flex enough to let
    the chain jump a tooth.

    With a steel bracket the motor would stall before it jump a tooth.
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    Project Re: More Mule then Rover?

    Can't win them all.

    the motor I planed to use for the tilting of the bucket use an inline 250Watt.
    7457

    and with it being only 250W I made it's brackets out of aluminum,
    but, the first motor...
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    Project Re: More Mule then Rover?

    the two outside batteries could quickly changed out.

    7441

    these type connectors should make the change over
    plug&play,some more.

    7442

    but they each weight about 100lb, so going to have...
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    Project Re: More Mule then Rover?

    jwatte, seems doable
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    Project Re: More Mule then Rover?

    https://www.youtube.com/watch?v=fMdravj3FDA&feature=youtu.be
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