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  1. #46
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    Oct 2004
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    Southern Highlands NSW
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    These adapted drum brakes look good, but do seem to need a lot of work to set up.
    Has anyone considered the Harrison method I described earlier? Comments? It would seem to be a simpler mod that could be almost invisible. The rotating element is already on your lathe - the countershaft pulley.

    Jordan

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  3. #47
    Join Date
    Aug 2008
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    near Rockhampton
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    Some machines use disc brakes from a motor bike...

    This is what the brake on my lathe looks like


    clickable thumb


  4. #48
    Join Date
    Jul 2010
    Location
    Melbourne
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    7,775

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    nadroj The only thing that would worry me about that set up is how it would react in reverse.

    As far as using a car caliper. One off the rear may work best. Lots of rear calipers (not commodores)have a cable for the handbrake and are a sliding single piston(its not like you are going to need a 6 spot ). So you could thin down one side a lot as the load will be less.

    As far as mine lathe goes I'm just thinking about pulling an old disc pad against the back of the V belts just where they go onto the pulley on the headstock. Sure it will wear the belt out a little, but how much?

    Dave do you know what sort of lathe is in your second set of pictures?

    Stuart

  5. #49
    Dave J Guest

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    Quote Originally Posted by .RC. View Post
    Some machines use disc brakes from a motor bike...

    This is what the brake on my lathe looks like


    clickable thumb

    Thats a band type drum brake isnt it?

    Dave

  6. #50
    Dave J Guest

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    Quote Originally Posted by Stustoys View Post
    Dave do you know what sort of lathe is in your second set of pictures?
    Stuart

    Stuart
    It's a 12 x 36 lathe like mine it's in the link in the same message.

    Dave

  7. #51
    Join Date
    Mar 2010
    Location
    Nth Qld
    Posts
    715

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    Don't forget a suitable single to three phase inverter has regenerative braking for the motor and some can even lock the rotor at zero rpm. Also motors with electromagnetic brakes are available too: http://www.weg.net/files/products/1-410.pdf

  8. #52
    Join Date
    Aug 2008
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    near Rockhampton
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    Quote Originally Posted by Dave J View Post
    Thats a band type drum brake isnt it?

    Dave
    Yes, and very effective..

  9. #53
    Join Date
    Mar 2010
    Location
    Nth Qld
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    715

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    Quote Originally Posted by nadroj View Post
    These adapted drum brakes look good, but do seem to need a lot of work to set up.
    Has anyone considered the Harrison method I described earlier? Comments? It would seem to be a simpler mod that could be almost invisible. The rotating element is already on your lathe - the countershaft pulley.

    Jordan

    Well if both Harrison and Colchester have been using it for years on cast iron pulleys it should work fine on other lathes. About the only caveat I can think of is that pulley does not reverse as the direction change is handled in the gearbox. So if you have a simpler lathe with an electric motor based reverse (light dim all over the suburb on reverse) the brake shoe would have to be made larger, say 120 degrees to keep it in place with a bit of wear. Also that shaft bearing may have to be checked to see if it can handle the sideways load that a disc won't have.

  10. #54
    Join Date
    Jul 2006
    Location
    Adelaide
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    2,680

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    can I add a bit here

    remember that stopping rotating shafts to a standstill in a very small space of time may cause things to undo...screw on stuff that is

  11. #55
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    Mar 2010
    Location
    Nth Qld
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    715

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    Quote Originally Posted by eskimo View Post
    can I add a bit here

    remember that stopping rotating shafts to a standstill in a very small space of time may cause things to undo...screw on stuff that is
    That is going to be the big problem for any non camlock style lathe chuck.

  12. #56
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    Jul 2010
    Location
    Melbourne
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    Thanks Dave. You need to log in to see the post.
    I'm just interested in the 2 speed pulleys... maybe one day
    Stuart

  13. #57
    Dave J Guest

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    Quote Originally Posted by Stustoys View Post
    Thanks Dave. You need to log in to see the post.
    I'm just interested in the 2 speed pulleys... maybe one day
    Stuart
    Mine is an 18 speed as well with 4 pulleys top and bottom. If you ever want an info let me know.

    Dave

  14. #58
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    920

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    Quote Originally Posted by Stustoys View Post
    nadroj The only thing that would worry me about that set up is how it would react in reverse.

    Stuart
    That's a very good point. With the setup as pictured, it'd have a stronger action in one direction than the other, a bit like a double-leading-shoe brake. Arranging for an equal effect either way would complicate things so it might not be such a simple solution after all. As Graziano states (and something that didn't occur to me) the Harrison motor/countershaft always spins in the same direction, so having the simple pivoted shoe isn't a problem.
    Thanks for the feedback, fellas!

    Jordan

  15. #59
    Join Date
    Oct 2001
    Location
    ACT
    Posts
    455

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    Here's what I would describe a "before" clean up shot of my c1960 Advance lathe (mad in Melbourne).

    Was lucky enough to get it with a full set of change gears and a whole lot of accessories. Bit small for my liking but its a good little lathe.

    HAve been without one for a long time and its good to be abl to do a few of those jobs that get saved up.

    Regards
    Steve

  16. #60
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
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    Quote Originally Posted by Stustoys View Post
    I'm just thinking about pulling an old disc pad against the back of the V belts just where they go onto the pulley on the headstock. Sure it will wear the belt out a little, but how much?
    Stuart
    If you do that, I think it'd be better to use a plain steel pad against the rubber.

    Jordan

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