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Thread: Looking for ideas
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15th Jul 2013, 06:41 PM #1Member: Blue and white apron brigade
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Looking for ideas
I'm looking for ideas for the following
I'm making a gizmo (a sort of linisher) that uses 2 , 25 mm shafts.
One shaft will run a belt and the other will run a disc but I would like to be able to disengage one while using the other.
So I'm looking at a floating pulleys (A) that ride on each shaft but each needs to be able to engage with its shaft.
I could use a simple pin that pass through the shaft but I thought it might be better to do this via some sort of collar or flange (B) that remains affixed to the shaft.
It needs to be reasonably quick and preferably manual i.e. does not involve use of tools.
I was just about to start cutting up some 80 mm round bar but I thought I would tap the collective wisdom, anyone have any ideas, even out of left field,
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15th Jul 2013, 07:39 PM #2
Assuming you are duplicating the complete pulley/bearing/disc set for each shaft, think back to the Hercus/Southbend lathe spindle and backgear setup, with the pulley driving the spindle through a pin for normal speed, or via the gear train by withdrawing the pin and engaging the gearing for slow speeds. In your case, no gearing needed, spring loaded pin in collar engages in hole drilled in pulley to drive, pin is withdrawn to disengage drive.
Hope this makes sense.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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15th Jul 2013, 07:59 PM #3Member: Blue and white apron brigade
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Correct
think back to the Hercus/Southbend lathe spindle and backgear setup, with the pulley driving the spindle through a pin for normal speed, or via the gear train by withdrawing the pin and engaging the gearing for slow speeds. In your case, no gearing needed, spring loaded pin in collar engages in hole drilled in pulley to drive, pin is withdrawn to disengage drive.
Hope this makes sense.
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15th Jul 2013, 09:14 PM #4Cba
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How much may it cost? Maybe a magnetic powder clutch would do? This is just the first of many that pop up if one does a Google search for "magnetic clutch":
Magnetic powder clutches, Magnetic powder brakes
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15th Jul 2013, 09:35 PM #5Senior Member
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Use one way clutches?
This depends on the layout of your design but if you have one way needle roller clutches fitted in place of the ball bearings in each pulley you could operate each pulley independently by reversing the motor. Pulleys would have to be arranged so the clutches operated as required and hardened shafts would be preferable or a hardened sleeve fitted under each pulley.
Mm.
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15th Jul 2013, 10:08 PM #6Golden Member
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Looking for ideas
BobL,
I ran into the same problem when I was designing my Grinding Station, which has a belt/linisher and a disc face plate. I ended up with two shafts close together and parallel, one for the linisher and one for the face plate. I mounted the motor on a long arm to provide belt tension with no other adjustment. No tools needed to change the drive over, just lift the motor and slip the belt off, the motor has a set of stepped pulleys for a range of speeds and I can run both at once if required. I did a write up with photos in the "Your Latest Project" thread post #138
Bob
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15th Jul 2013, 11:05 PM #7Member: Blue and white apron brigade
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Thanks for all the ideas.
I'm trying to build the unit with stuff I already have so although I like the idea of powder or one way needle roller clutches, they are probably a little out of my league.
I already have the shafts, drums, bearings, steel for the frame and a new 2HP 240V 3 phase motor I picked up for $70
One thing I do want is speed control so I will be using a cheap VFD.
Bob, I remember your unit - it looks really slick and it is what motivated me to get going on mine originally. I'm going to attempt to have the whole thing rotatable by 90º (that's one reason why I want to be able to run the disc and linisher separately). This means I can't use the motors weight for belt tension so I might have to use tensioning pulleys. I haven't got that far yet.
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15th Jul 2013, 11:41 PM #8
To expand on Cba's idea, car airconditioning clutches are electro magnetic. I would think they would run the average belt linisher and disk although I don't know what size you are looking at given you are using a 2 hp motor. It should be easy enough to get some worn out compressors from repairers, or even car wreckers. They may require seperate outside bearings for stability tho.
Dean
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15th Jul 2013, 11:45 PM #9Member: Blue and white apron brigade
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15th Jul 2013, 11:59 PM #10Senior Member
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Bob, If you are going to use the linisher to shape steel or cast iron the dust could be a problem with magnetic clutches, it will of course be a problem with unprotected bearings/needle rollers, as well.
Mm.