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  1. We are jiggering plates (see attached) with an Axner Power Arm onto pure and simple hump molds. We are experiencing a tremendous amount of cracking and need help! We have done a very similar form without the jigger arm, by slabbing and attaching the foot and had no cracks at all. We used a different clay body with grog but should have worked the same as 181 (has grog). None of our other forms are experiencing cracking in the dry room, regardless of the clay body however none of the other forms are jiggered which leads us to believe it is related to jiggering. First guess is perhaps the pressure of the jigger arm is causing the clay to stick to the plaster. When the clay dries too quickly it has no where to shrink and cracks internally on the plaster, then externally on the ware boards. We don't know any way to remedy this other than just not jiggering.... Troubleshooting thus far: - Drying too quickly: Initially we thought it was only due to the forms drying too quickly and the humidity. So we brought in a humidifier into the dry room. Cracks still happening. - Clay Body (grog vs no grog): We were previously using Standard 365 (no grog). We switched to Standard 181 and...still the same amount of cracking. These are all just guesses as we are still experienced cracks galore...we'd certainly appreciate any thoughts!! Best, Ernie ernieniblack@gmail.com
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