Patent ID: 8585843

Claim:
A method for manufacturing a retreaded tire including buffing a tire casing to be retreaded, such method comprising: mounting the tire casing to be retreaded so that it may be rotated about a central axis; taking an outer measurement indicative of the distance from the central axis to an outer surface of the tire casing; performing iterative cuts to remove rubber from the tire casing to be retreaded using a cutting device; acquiring electrical signals corresponding to an amount of electrical work that has been expended by the cutting device through the iterative cuts; estimating an amount of material removed from the tire casing through the iterative cuts based on the amount of electrical work; between each iterative cut, using the electrical signals to estimate an amount of material stored by the previous cut, the material stored defined as the difference between a total amount of material made available for removal by moving to a cutting depth of the previous cut and an amount of material actually removed by the previous cut; determining a target outer dimension of the tire casing after buffing, such target outer dimension indicative of a desired distance from the central axis to the outer surface of the tire casing; determining an offset, based on the amount of material removed through the iterative cuts, for a final cut made on the tire casing to be retreaded, such offset being indicative of an amount of rubber not being removed by prior iterative cuts because of elastic recovery of a rubber material of the tire casing after the cutting device has passed over the rubber material; performing the final cut on the tire casing where the offset is applied to adjust a radial position of the final cut so that it is nearer to the central axis than the target outer dimension, such offset yielding an achieved outer dimension of the tire casing that substantially corresponds to the target dimension; applying and curing a tread to the tire casing in a manner to attach such tread and generate a retreaded tire.