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Thread: Show us your lathe
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11th August 2010, 08:09 PM #46Mechanical Butcher
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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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11th August 2010, 11:01 PM #47Pink 10EE owner
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11th August 2010, 11:08 PM #48GOLD MEMBER
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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
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11th August 2010, 11:59 PM #49Dave J Guest
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12th August 2010, 12:00 AM #50Dave J Guest
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12th August 2010, 12:01 AM #51SENIOR MEMBER
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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
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12th August 2010, 08:08 AM #52Pink 10EE owner
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12th August 2010, 10:06 AM #53SENIOR MEMBER
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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.
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12th August 2010, 10:17 AM #54GOLD MEMBER
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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
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12th August 2010, 10:24 AM #55SENIOR MEMBER
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12th August 2010, 10:32 AM #56GOLD MEMBER
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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
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12th August 2010, 12:25 PM #57Dave J Guest
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12th August 2010, 08:02 PM #58Mechanical Butcher
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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
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12th August 2010, 08:52 PM #59SENIOR MEMBER
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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
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15th August 2010, 05:50 PM #60Mechanical Butcher
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