translation vs rotation

Magnus · Post by **Magnus** » Sun Feb 20, 2011 9:24 pm

The only difference is that one arc is longer than the other.

Just nonsense Frank. The change of angle is exactly the same. Casting stroke length is different - stroke length is different - longer.

Stoatstail50 · Post by **Stoatstail50** » Sun Feb 20, 2011 9:25 pm

Well, as Andy pointed out I wasn't asking you about the size of the arcs, just the position.

Anyway, no matter....What is the normal unit of measure for your arc ?

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 9:27 pm

Length of the arc Magnus. In the first diagram the length of the stroke IS the casting arc. Nothing nonsensical about that.

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 9:33 pm

I'd say it could only be expressed in degrees of rotation, and obviously, in either diagram the arc is either positioned closer or further apart. So what else is new under the sun ? People have been casting both ways for a couple of hundred years

Stoatstail50 · Post by **Stoatstail50** » Sun Feb 20, 2011 9:35 pm

Cool....I use degrees for my arcs too....

So, anyway, if the arcs are the same in your diagram but one is longer than the other what is your normal unit of measurement for the length ?

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 9:45 pm

Actually they are exactly the same length. It's only an optical illusion that they are not.

Stoatstail50 · Post by **Stoatstail50** » Sun Feb 20, 2011 9:48 pm

Frank LoPresti wrote:The only difference is that one arc is longer than the other.

Actually they are exactly the same length. It's only an optical illusion that they are not.

Right....

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 9:49 pm

Stoatstail50 wrote:Cool....I use degrees for my arcs too....

So, anyway, if the arcs are the same in your diagram but one is longer than the other what is your normal unit of measurement for the length ?

If you meant the length of the arc I suppose whatever works. I don't measure it anyway but I suppose some unit of length. I thought you perhaps meant the length of the lines themselves.

Stoatstail50 · Post by **Stoatstail50** » Sun Feb 20, 2011 9:52 pm

OK so to differentiate between these two arcs of the same angle but different length you would say that one is 90 degrees and the other is 90 degrees with a length of X inches or centimetres or something ?

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 9:57 pm

Sure I guess. But overall the way I look at it the length of the stroke is simply the distance the hand moves during the CS. Could be only rotational distance or some combination of rotational and translational distance. Never set out to measure any of these things anyway unless I'm using my CA.

Stoatstail50 · Post by **Stoatstail50** » Sun Feb 20, 2011 9:58 pm

Great...thanks...

White Hunter · Post by **White Hunter** » Sun Feb 20, 2011 10:00 pm

Hi Frank

Straight up question, I don't own a CA so I don't know......

Can it measure translation...?

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 20, 2011 10:03 pm

Frank LoPresti · Post by **Frank LoPresti** » Sun Feb 27, 2011 6:44 am

Lee,

The reason the casting analyzer does not show translation is two fold. To much data to add that was of little relevance. Also that the amount of speed that translation could generate in and of itself is minimal without the rotational aspect of the stroke.

Frank

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