Last time I worked with bike parts, I ended up making a few "end caps." I could use these pieces to cover the open end of a bike part and add a little more visual interest, color and texture to that area of the sculpture. I made extras of these pieces, not knowing for sure if I would use them until after the piece was mostly completed.
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detail of "Big SRAM'" sculpture from last year. |
This time around I seem to have many pieces that might lend themselves to being embellished with similar end caps. I started making a few last time I threw. I measured the end caps to fit in sets of gears. I have quite a few sets of gears and the end caps could fit in them right side up, upside down or on the end of an extension sticking out of the gear stack.
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bike gear |
In preparation for throwing I measured the opening of the gear stack, though I have quite a bit of flexibility in how the end caps sits in or on the gears. I have to account for shrinkage during firing, so, though I measured, I need to add about 10% onto that measured size when I throw the form.
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measuring the attachment size with calipers |
I threw several end cap shapes and several bulb forms "
off the hump." The end caps can be simple bowls forms or more complex bowls with lips. The advantage of the lip is a tighter fit and, more importantly, more surface area on which to apply the epoxy when attaching the forms to the metal or plastic of the gear stack.
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throwing "off the hump" |
An additional advantage of a lip is that it allows more room on either side of the measurement if shrinkage isn't exactly 10% at this temperature--or if my measurements aren't accurate.
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measuring the attachment size |
I cut the bowls off the hump so that I could throw more pieces with the clay remaining on the wheel. The same day I also threw a bunch of extra forms to work with during the coming weeks. After the end cap bowls dried for one day, I trimmed them and then embellished their surfaces with stamps and sprigs.
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undercutting the piece off the hump |
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trimming a round shape |
The end cap doesn't (and shouldn't) fit while it is wet. It will shrink during drying and in the kiln. It should fit after it is fired. I made several different surface textures, but I will probably make additional matching pieces in case I end up using the end caps as sets for one sculpture, as I did last year.
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a wet end cap, too big to fit inside the gear stack |
After the end caps dry and are bisqued, I will layer underglazes and fire the pieces again. The end caps will be added to the sculptures relatively late in the process. Several end caps will be interchangeable so that I can eliminate pieces that shrink too much, aren't glazed well or just don't seem like the best option.
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various end caps |
I'd like to watch you do some of this. I find it fascinating.
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