Now you can move forward to the 1200 grit stage, continuing to use a gentle touch. Be sure to dry your cab off thoroughly and check for scratches and to see if you are removing too much of the top layer. Once you have it shaped and domed, allow the 600 grit wheel to remove any remaining scratches. There’s not much you need to do, since the 280 will grind this soft material rapidly. It’s best not to use heavy coarse grit wheels and go right to the 280 soft resin wheel to gently dome the top of your cab and finish shaping it. To make sure this doesn’t happen, cut your preforms to the shapes you desire, and grind the backside flat as you attempt to make an even girdle height around the sides. It will sand down too far yielding a light golden yellow and the pattern may be lost. Remember that the outer layer is much darker, iridescent and thin.īecause it’s comprised of calcite, it’s easy to grind through the top layer and lose that lush darker color. Carefully choose areas that can be cabbed that don’t have a great deal of an arch across the top or an uneven area that will have to be ground down to an equal height causing you to lose the top coloring on a portion of your cab. Once you have the two sides cut and prepared, you are ready to draw out your design. Then examine the inside to see if it needs to be filled with epoxy or backed for stability. Getting Startedįirst, cut the entire ammonite in half creating two identical portions to use.
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