Drive system for small diameter abrasive discs

A drive arbor and small diameter abrasive disc combination, the drive arbor for engaging the small diameter abrasive disc with a power tool, the drive arbor comprising:

• a shaft portion located at one end of the arbor, the shaft portion having an outer diameter adapted to engage the power tool;
• external threads formed on the other end of the arbor, the external threads having a first substantially constant pitch;
• a stop located between the shaft portion and the external threads for limiting the extent of engagement between the threads on the arbor and the threads in the disc by contact between the disc and the stop, the location of the stop on the arbor being selected to permit complete engagement of the arbor with the disc after the disc is turned between about 1/4 and about 11/2 turns;
• and
• the abrasive disc comprising
• a backing plate having a mount extending outward from the backing plate on one side of the backing plate, the mount having internal threads formed on it for threadingly engaging the threads formed on the arbor, the engagement of the threads in the mount with the threads on the arbor providing a rigid removable attachment for facilitating rotation of the disc by the power tool when the arbor is engaged with the power tool, the threads on the mount having a second substantially constant pitch, the second pitch being different from the first pitch wherein the backing plate is made from a glass filled polymer.

A drive system for engaging a small diameter abrasive disc with a power tool, the drive system comprising:

• an arbor for engaging the power tool, one end of the arbor comprising a shaft portion and the other having external threads formed on it, the external threads having a first substantially constant pitch;
• an abrasive disc backing plate having a mount extending outward from the backing plate on one side of the backing plate, the mount having internal threads formed on it for threadingly engaging the threads formed on the arbor, the engagement of the threads in the mount with the threads on the arbor providing a rigid removable attachment for facilitating rotation of the disc by the power tool when the arbor is engaged with the power tool, the threads on the mount having a second substantially constant pitch, the second pitch being different from the first pitch;
• and
• a plurality of abrasive flaps bonded to the backing plate.