On 13/07/10 22:26, Olin Lathrop wrote:
> Jake Anderson wrote:
>    
>> The field of stopping a rotating metal disk is a fairly thoroughly
>> explored field, they are called car brakes.
>>      
> Not really.
>
> Car brakes have to dissipate a lot of energy and must be able to be "soft".
> In other words, the control input is proportional, and the wheel must NOT be
> frozen for less than full input.  That's rather different from stopping
> something as fast as possible.
>    
The principle of operation however can be the same, and given the amount 
of work done in the field it seems silly not to draw from it.
Not just car brakes, clutches, specifically dog clutches may also be useful.
> The energy dissipation issues are totally different too.  Car brakes have to
> be able to take repeated application such that the heat must be transferred
> away.  With the table saw blade, the whole event is over so fast that the
> heat has no time to move anywhere before it stops being produced.  Then you
> have lots of time to eventually dissipate it.
>    
Exactly, so car brake style engineering should be a superset of the 
solution rather than a subset.
> So no, people haven't been stupid (as your statement tries to imply in a
> backhanded sort of way) for failing to suggest a car brake should be copied.
>    
You calling somebody for implying other people are stupid? pots n 
kettles isn't it?
Or is it different when your on the other side?

Regardless, any high and mighty tone wasn't directed at Oli Glasser or 
anybody else for that matter, I had been reading the thread and the idea 
occurred to me, so I replied at that point. No offence was meant and if 
any taken then I'm sorry.

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