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final form - catenoid
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Final form (rear) and another showing less developement
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Truing up edges on smooth, flat surface
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Correct any uneven edges
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Roundness of interior should be established and continually corrected as needed, before this point
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Further development of outward-facing, concave radius
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Left side developed. Right side underdeveloped
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Switch to this position to further develop the smaller radius
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The marks evident in the center, inside area, indicate the form has met the stake. Further hammering in this position will likely stretch the form.
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See the gap? More hammering/metal movement in this groove of the stake can be achieved
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Hammer marks on the outside center, but no marks from the stake on the inside center. This indicates the form has not met the stake. If you've done a few courses, anneal before continuing
teddmcdonah:
Keen observation should be paid to marks left by the hammer and stake, as well as, the evenness of the spacing between the edges as a radius is developed
teddmcdonah:
After hammer blows, the form should be in contact with the stake. Make sure to use overlapping hammer-blows
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A hammer blow in this position, will allow the form to be pressed closer to the stake, and will push the bump inward, aligning it with the, directly, previously worked area
teddmcdonah:
Keep the hammer face perpendicular to the stake. Use overlapping hammer blow, and rotate your form not your hammer
teddmcdonah:
Courses closer to the center are now hammered out with a little more aggressive hammer blows. Always overlapping
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Without looking too hard, it is clear more hammering is required to get the form to "move" closer to the stake and develop the axial curve/radius
teddmcdonah:
After a few courses around the outside edges, a "bump" sometimes occurs towards the center. This is material that has not yet been hammered. As you progress towards the center this will go away. This typically occurs on forms of this variety, the greater
teddmcdonah:
Hammering begins at the outside edges, courses alternates from near side to far side. The form can be taken off the stake and flipped end-for-end. Courses also progress towards the center line of the generator curve.
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Frustum properly bound and ready for soldering
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binding wire on tapered form (frustum)
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soldered frustum
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copper forms
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Tea cup
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