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Stroke On Mechanical Hammers

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I know that on Bradley Compact Hammers the stroke is adjustable but how much stroke do mechanical hammers have. I am also thinking because of the spring the hammer travels further than the stroke of the crank.

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The crank shaft on my homebuilt has an offsett of 3.5 inches, for a potential stroke of 7". The attachment point of the pitman arm to the spring is adjustable, providing more (or less) stroke. When the top die is adjusted an inch or so over the bottom die, the actual stroke of the tup is between 11 and 12 inches, due to the whip in the springs.

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