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  1. #31
    Join Date
    Jan 2006
    Location
    Blue Mountains NSW Australia
    Posts
    408

    Default

    The reversing switch is so that you can cut threads as Ken states above.

    For now, I will be using the reversing switch to cut right hand threads as I don't have a thread chasing dial. Essentially I'll take a light cut, slow as I reach the end, reverse the motor and back track to the start, dive in a bit deeper, and so on.
    By reversing the direction of the motor, without disengaging the apron from the lead screw, the job remains indexed to the tool. If you change feed direction with the gears, you will cut an opposite hand thread over your good work, as the chuck spins in the same direction no matter what gear changes you do....... hence the need for reversing the motor.

    Is that clear???? I have had a couple of brews and may not have explained it too well.

    Edit.... The chuck unwinding is not an issue for me Don, although others may have differing experiences. I only cut threads with back gearing engaged which gives my about 40rpm. I like the slow speed because I can stop the lathe very quickly at the end of a cut....almost instantly. The chuck hasn't even come close to starting to unwind, and I don't think it ever will because of the slow speed and lateral forces on the spindle when cutting.
    Last edited by Fossil; 31st Mar 2008 at 08:42 PM. Reason: More info for Don

  2. #32
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

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    In my opinion the chances of the chuck removing its self from the spindle of a 9" Hercus lathe is very unlikely if the machine is used correctly.
    I would suspect if you could go from forward to reverse simultaniously there is the chance,with the type of drum switch used I would think that the spindle would have to come to a dead stop prior to reverseing,if the switch is thrown without the spindle virtually at stop the spindle will more than likely continue to rotate in the originally selected rotation.
    If there is a concern of the chuck unscrewing I would suggest to use your backgear to lock spindle and with chuck key and soft hammer tap chuck to make sure it is securely home on the spindle nose.
    Unless you have the appropriate chasing dial reverseing the lathe is the quickest way to screw cut(saves having to chase the thread using compound and cross slide.
    As for uses for reverseing there are many, a couple of the top of my head cutting chamfers,parting off,using tools that might have to higher centre height unless there turned upside down,left hand boring bars,and milling .

  3. #33
    Join Date
    Nov 2006
    Location
    Heidelberg, Victoria
    Age
    79
    Posts
    2,074

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    Fossil and Pipeclay,

    Thank you for bailing me out. I was caught a bit short for other reasons to install a reversing switch.

    Thanks,

    Ken

  4. #34
    Join Date
    Nov 2006
    Location
    King Island, Australia
    Posts
    16

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    Quote Originally Posted by pipeclay View Post
    Unless you have the appropriate chasing dial reverseing the lathe is the quickest way to screw cut(saves having to chase the thread using compound and cross slide.
    I understand this, and if no chaser dial, it is easier.

    As for uses for reverseing there are many, a couple of the top of my head cutting chamfers,parting off,using tools that might have to higher centre height unless there turned upside down,left hand boring bars,and milling .
    Can't fathom the chamfering or the parting off, in fact any of it.

    Cheers

    Donald (On the Rock)

  5. #35
    Join Date
    Nov 2006
    Location
    Heidelberg, Victoria
    Age
    79
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    2,074

    Default

    frazerbluff,

    I too would like to know about chamfering and parting off with the lathe in reverse, advantages etc..

    For me, another reason for motor reversal is tapping a hole in the end of a shaft. Tap in, reverse to back out, a "parting" thought.

    Ken

  6. #36
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
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    In regards to the parting off there are times when depending on the type of material you would find that inverting the parting tool and running in reverse is the better option.
    Im not saying that this is a commonly used method but over the years i have used this method,it can reduce chatter and minamize deflection in your bar,if you look at some of the machines that have a provision for two tool posts they often use the rear post for parting or other operations,(yes the machine is not running in reverse but the tools are inverted.
    In regards to cutting chamfers depending on the geometry of the tool if you off set your tool post you can cut internal or external chamfers without having to change tools.
    this method of adjusting tool post and useing reverse is very handy when the angle of your chamfer is not critical,other wise if angle of chamfer is critical just off set compound slide to correct angle .
    I suppose i for one like to be able to achieve as much machineing variation as possible with the least amount of tool changes.

  7. #37
    Join Date
    Jan 2018
    Location
    Melbourne
    Age
    76
    Posts
    31

    Default Reversing drum switch wiring.

    Hi all,
    Bought a single phase reversing drum switch off mighty Mal for the Hercus.
    Included wiring instructions were in Chineseium, did a translate, still not really any the wiser.
    Attached is a picture of the current motor wiring, the drum switch layout from the carton, drum switch picture from AMWH web site, and a layout diagram I found online.
    Motor is single phase Crompton squirrel motor ( I am told).
    Can anyone enlighten me on where the angry pixies should be connected please?
    Lathe motor (2).jpg Drum switch wiring (3).jpg Drum switch (schematic).jpg
    Last edited by Tex260Z; 27th Nov 2022 at 03:52 PM. Reason: add diagram

  8. #38
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

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    It is a legal requirement in Australia that electrical work needs to be done by a licenced electrician. You will not be insured if anything goes wrong.
    Gear cutting specialists and general engineers www.hardmanbros.com.au
    Fine pitch gear cutting from 0.1 Module www.rigear.com.au

  9. #39
    Join Date
    Aug 2021
    Location
    Sydney
    Age
    46
    Posts
    116

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    Have you got a reference you can quote on that? In trade level TAFE electronics technician training (not sparky training) we were taught that we could legally work on mains powered equipment from the mains plug back into the equipment. The plug being the demarcation point. Has something changed?

    I wouldn’t recommend anyone work on mains powered equipment without suitable qualifications but I don’t think it’s limited to electricians.

    Back to the topic, I think you’ll need to find some reference material for the motor you wish to reverse. Kind of hard if your not already acquainted with such things. Not something for a hobbyist without suitable training and/or qualifications.

  10. #40
    Join Date
    Aug 2021
    Location
    Sydney
    Age
    46
    Posts
    116

  11. #41
    Join Date
    Jan 2018
    Location
    Melbourne
    Age
    76
    Posts
    31

    Default Here we go again.

    I wasn't actually looking for a lecture, (or to start an argument).

    Yeah yeah I know everything is supposed to be done by sparkies. however, at 75 years of age with 30 years experience in solar and marine navigation aid equipment, having wired pretty well everything in my house and wiring my shed lighting and power, installing a hoist and converting it to VFD power, and Dog knows what else (all inspected and approved), I reckon I could probably tackle (re) wiring my lathe.

    I am pretty sure how it should be setup but being a cranky old perfectionist I like to double and triple check everything before I proceed.

    I wish those damn sparkies who used to contract to me had done the same, maybe them they wouldn't have wired all those (old style) circuit breakers ares about!

    It doesn't matter how many bits of paper you have or OH&S sheets are filled out, idiots still die.

  12. #42
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

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    Tex, I don't know if this helps but....

    I have an original forward/reverse switch on my ARL. The switch controlled a 3 phase motor which I replaced with a 1 horse single phase capacitor start / run Brook Crompton Betts motor. The attached sketches show the connections.

    DSC_7545.JPG IMG_20190519_100320002.jpg IMG_20190519_100337669.jpg IMG_20190517_153704975.jpg

    Bob.

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