Question about Hobart D300 Stand Mixer

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We have a Hobart D-300 mixer, and want it to run in both directions. How can we modify the gearbox so that the mixer can be rotated in the opposite direction to the normal direction without damaging the brass gear? BTW We are using the mixer for a laboratory experiment.

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  • gary_sroka Sep 29, 2010

    I need this mixer to run in both directions for my experiment to work. It will operate under medium loading. I understand that there will be an axial thrust on the first stage of the gearbox. Can I just install a thrust bearing on top to keep the shaft in place? Or is there something else that I am missing? I need to operate the mixer at low speed only, and if it only lasts for one half of its expected life, I would be satisfied.

  • gary_sroka Sep 29, 2010

    I know how to reverse the electrical to run the motor in reverse. I am concerned with damaging the gearbox since the manual specifies that the mixer must be run in the proper direction. Therefore, I need to know why the gearbox will be damaged if inreverse the direction, and how can I modify the gearbox so that the damage will not occur

  • gary_sroka Sep 30, 2010

    Again, the mixer is connected to a 220v supply whereby the rotation of the motor can be easily reversed. The problem is that when the mixer is reversed the axial thrust on the brass gear that meshes with the worm gear is up instead of down. Under load, the shaft and/or brass gear will move upward damaging the brass gear. I am working on solving this problem, but need assurance that there is not something else that will present a problem

  • gary_sroka Sep 30, 2010

    Please read my. Omments before responding. This is not a question a out how to make the motor run in the reverse direction. I need to know why the gearbox itself will be damaged when run in the reverse direction. Is it only the fact that the axial force on the shaft that holds the brass gear will be reversed. Or is there something else that I am overlooking. Is there a chance that the worm gear that meshes with the brass gear cannot carry the load when the motor is run in the opposite direction?

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The gearing is degreed so if it ran in a reversed mode the gears will bind in a small amount of time. That could lead into a expensive repair. Best to leave it run as it was designed to be ran

Posted on Oct 01, 2010

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Whilst devices designed to run in one direction are often done that way for a reason you may be able to fit a phase reversal switch

This takes the positive and negative and by use of a switch swaps them over

http://www.kpsec.freeuk.com/components/switch.htm

Use example number 6 for the concept. Be aware that you are playing with potentially lethal voltage so take the required care !

Also test with only short bursts before running for long perids to make sure the mixer does not have any ANTI REVERSE system installed (not likely but possible)

Also keep the reverse runnin times down to a minimum and monitor motor heat etc.

You can also do this with a suitable contactor for industrail voltages and maybe add "de-bounce" components to ai switching. avoid rapid switching without de-bounce


Bob

Posted on Sep 30, 2010

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    Project NOMAD Oct 01, 2010

    I only just saw you comment as the system on here is pretty pooched.

    Some gearboxes do indeed have a "floating gear" this may disengage the drive when forced into reverse.

    As far as actually running in reverse then as I did state that could only be checked by trial. Many mixers even of the same model tend to have differences during the manufacturing life of the product so there is no simple YES or NO.

    The fact that the manufacturer suggests against it is your first clue. as an engineer I would have to physically see the gearing layout for myself to be sure. The limitations imposed on this website preclude that possibility.

    Even now I cannot see the comment as the moment I hit the add comment button it wiped out your comment.

    I answered based upon your original question so I am sorry that you did not consider it any good for your needs even though it did and have gone above and beyond the query.

    If you really want a 3 or 4 tumbs up answer then you should be taking it to an engineer or engineering department of a suitable college for them to view and make a final yes no.

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You do not really need to mess with the gearbox.Do you have it apart?All it should require is 2 wires,the same thickness as what is hooked up from motor to switch or larger,and a 3 position switch(1 off position and 2 on positions).If you are in USA you can call me at 727-584-2554 anytime after 10AM until about midnight.It would be much easier to describe and explain and exchange information.Greg

Posted on Sep 29, 2010

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I couldn't find any report of anyone having done this, but I know a way that would work, possibly, but I'm not sure what would be required for the modification. A motor has to run the gear assembly, so the easiest way to modify the gearbox to run in reverse would be to make the motor that runs it switched polarity to run it backwards, which, in turn, should run the gearbox in reverse, depending on the ability of the gear teeth to do that without damage. Otherwise, you will have to have essentially two separate gearboxes to engage, but I guess since it's a lab, you could do that. Seems like the logical solution, although might be quite a project.
Anyway, those are my thoughts, however, not having the machine in front of me, I'm just taking the obvious guesses.

Posted on Sep 29, 2010

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Switch the wiring to the motor. If wires are reversed, then the motor should turn the opposite direction. If the gear doesn't allow it, then you will want a flat gear instead of beveled ones.

Posted on Sep 29, 2010

  • Nate Stansfield
    Nate Stansfield Sep 29, 2010

    You will have to flip your hear upside down so it turns the other way. You can't have go both ways, just one way or the other way.


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You can't modify the gearing , there is no space in the casing for that. The only thing you can try is to reverse the engine - you will need to modify the wiring in the engine, preferably by installing a manual switch that will select the turning direction.

Posted on Sep 29, 2010

  • Azrael SRL Sep 29, 2010

    The worm screw has only one thrust bearing - if you put the engine in reverse it will wear it a lot quicker. Since this isn't a problem for you - you will use it only at low speed and you accept the fact that it will be gome faster - then there is nothing stopping you to make the required modification. If you really want to be sure it will work until your experiment is finished then just weld/glue to the case a pointy support on which the shaft would **** if the bearing is worn out.

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This mixer's gearbox is definitely not made to operate that way, and it is inadvisable for you to try to do so. Noone will be able to tell you that information, as I can't imagine too many people in the world have ever tried to modify the gearbox in this method.

Thanks
Tim

Posted on Sep 28, 2010

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