[Robotgroup] RoboSpinArt design flaw: Failure=Ouch!

[Don Colbath]

Super idea!   I was thinking vacuum myself but was wondering how to 
plumb vacuum to the plate.  Holes would probably work fine.  Half holes 
with curved areas would create an even stronger low pressure. Think 
reverse cheese grater.  I have vacuum motors with impellers if you would 
like to examine how they are made. 

Don

TomD wrote:

>Good idea on making the platter circular, but I'd
>stay away from acrylic, it shatters. Lexan would be
>a better choice. If there were time, I'd go for aluminum,
>a thin plate with cutouts for the corners of the paper
>and maybe some vents cut throughout to pull the paper down
>when it is spinning. Sort of a reverse air-hockey table effect.
>Something like the impeller in a shop vacuum is what I'm thinking of.
>
>
>robodigest at innervate.com wrote:
>  
>
>>Quoting Vern Graner <vern at txis.com>:
>>
>>[trimmed]
>>
>>    
>>
>>>The paint arm gantry moved to its center position (about 1/2 over the
>>>paint bucket), the speed controller moved to its center position (about
>>>1/2 speed for the turntable) but most importantly, the ink jet gantry
>>>moved to *its* center position, which is all the way down into the
>>>bucket, resulting in:
>>>
>>><BANG!!!>
>>>      
>>>
>>[trimmed]
>>
>>Would it help minimize the shrapnel if we converted the turntable from  
>>a rectangular shape to a circular shape closer to the diameter of the  
>>bucket?  The frictional component of the damage would not be lessened  
>>but the linear momentum imparted to paint arm gantry by the corners of  
>>the turntable should be.
>>
>>It seems obvious that we need to proceed with the acrylic back -  
>>mechanically (not magnetically) latched - to minimize mess and  
>>postential damage to operator and/or bystander.
>>
>>
>>All the best....
>>
>>Mike
>>
>>
>>
>>
>>
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>>    
>>
>
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I'm for celibacy in moderation.