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  1. #1
    Join Date
    May 2010
    Location
    Perth
    Posts
    108

    Default looking for ideas on lathe overhead belting conversion

    G'Day,
    I've got an old Southbend I've started restoring - overhead belt was the original design, hard to change that with the castings the way they are.

    I'm looking for a few ideas on suitable designs for the overhead conversion - belt tensioning/ alignment, unloaders, and motor mounts. I figure I can't be the only person who's had to do this, and I'm one of those people who looks at other people's designs, let them all mull around in the grey matter for a while, then spit out a design to start with.

    I am looking at probably 600mm of distance between the top of the spindle, and the top of the countershaft.. the lathe sits under a mezzanine.
    My current motors are 3ph antique, variable speed DC treadmill conversion, and I'm sure I could scare up a single phase option easy enough.

    Google has given me a few leads on designs, but not a lot of detail, and certainly little information in the alignment design.

    anyone got any tips or photos they want to share?

    thanks,
    Des

  2. #2
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    67
    Posts
    4,030

    Default

    Hi Des, I'm led to believe that the Hercus is a copy of the Southbend, have a look for some images of Hercus lathes to see if you can gain some ideas. I have a Horizontal mill that used to run overhead belts, it has a system that I've attached a pic of, if that helps.
    Showing the belt drive lay out.
    Horimill 5.JPG
    The tensioning set up.
    Horimill 1.JPG

    HTH
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #3
    Join Date
    May 2010
    Location
    Perth
    Posts
    108

    Default

    Kryn,

    thanks - I don't know if the prewar SB13B was ever copied - most of the hercus lathes I saw were copies of the SB9 models.

    Looking at the pictures you sent, is it fair to say that the alignment of the belts are managed via moving the cone pulley on the shaft, and the accuracy of the pivots and bearing centres.. or is there some adjustment in the pivot mounts and bearing mounts?

    Your belt looks around the same kind of length I will be using - do you find the belt slips much? or is the tensions sufficient? ( recall reading that the longer flat belts were less reliant on tension for power transfer compared to shorter belts... it was the tech advantage of V belts which took that distance element out of the equation....

    Thanks,
    Des

    Quote Originally Posted by KBs PensNmore View Post
    Hi Des, I'm led to believe that the Hercus is a copy of the Southbend, have a look for some images of Hercus lathes to see if you can gain some ideas. I have a Horizontal mill that used to run overhead belts, it has a system that I've attached a pic of, if that helps.
    Showing the belt drive lay out.
    Horimill 5.JPG
    The tensioning set up.
    Horimill 1.JPG

    HTH
    Kryn

  4. #4
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    2,530

    Default

    Hi Des, Guys,

    I would say from the museums that I've visited, the original line shaft system was overhead well above head hight and the belt was quite long and not what I would call tight. This would make the belt quite heavy reducing slip. The belt would have been moved by a fork from a live pulley to and idler allowing the operator to move the belt to another size pulley. There didn't seem to be a problem with the slight miss alignment of the belt, probably due to its length.

    I would suggest that alignment becomes a greater problem as the belt gets shorter. From pictures I've seen it seems that speed changing has been transferred to "V" belts and a flat belt from a single driving pulley used between them.

    JMTPW.
    Best Regards:
    Baron J.

  5. #5
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    67
    Posts
    4,030

    Default

    Quote Originally Posted by desbromilow View Post
    Kryn,
    Looking at the pictures you sent, is it fair to say that the alignment of the belts are managed via moving the cone pulley on the shaft, and the accuracy of the pivots and bearing centres.. or is there some adjustment in the pivot mounts and bearing mounts?

    Your belt looks around the same kind of length I will be using - do you find the belt slips much? or is the tensions sufficient? ( recall reading that the longer flat belts were less reliant on tension for power transfer compared to shorter belts... it was the tech advantage of V belts which took that distance element out of the equation....Thanks, Des
    Hi Des,
    The only pulleys are the domed flat belt ones, 3 sizes. There doesn't appear to be any form of adjustment, apart from slots in the angle to "twist" the frame into alignment, on the pivots, from memory???? Can get detailed pics tomorrow, if required?
    As it's a 3phase unit, I've not fired it up, so I can't comment as to slipping etc.
    I was thinking that later on, I might convert the flat belt pulleys to V Belt drive, just to make it easier, should one let go.
    Kryn
    To grow old is mandatory, growing up is optional.

  6. #6
    Join Date
    May 2010
    Location
    Perth
    Posts
    108

    Default

    Kryn,

    the slots in the angle iron sounds about right - at the pulley bearing mounts. Thanks, no need for more photos.

    in my case, I will have to up with the flat belt, but can then go sideways with the motor - so I will have 2 lots of adjustment to help alignment.

    I will take photos, but at this stage putting them up will be a few months away.


    Quote Originally Posted by KBs PensNmore View Post
    Hi Des,
    The only pulleys are the domed flat belt ones, 3 sizes. There doesn't appear to be any form of adjustment, apart from slots in the angle to "twist" the frame into alignment, on the pivots, from memory???? Can get detailed pics tomorrow, if required?
    As it's a 3phase unit, I've not fired it up, so I can't comment as to slipping etc.
    I was thinking that later on, I might convert the flat belt pulleys to V Belt drive, just to make it easier, should one let go.
    Kryn

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