High Quality Custom Molded Rubber Products Custom Rubber Molding from Jefferson Rubber
SUMMARY OF RMA DRAWING DESIGNATIONS
Dimensional Tolerances (Tables 2-5)
Finish (Table 6)
Flash Extension (Table 7)
Bonding (Specify Grade and Method on B1 and B2)
(Tables 8 & 9)
Load-Deflection Characteristic (Specify only when needed) (Table 10)
No Designation. SEE TEXT AND/OR YOUR RUBBER SUPPLIER. SPECIFY ONLY WHEN NEEDED.
RMA DRAWING DESIGNATION FOR FINISH
A smooth, polished and uniform finish completely free of tool marks, dents, nicks and scratches, as produced from a highly polished steel mold. In areas where F1 is specified, the mold will be polished to a surfaced finish of 10 micro-inches (250nm) or better.
A uniform finish as produced from a polished steel mold. In areas where F2 is specified, the mold will be polished to a surface finish of 32 micro-inches (800nm) or better but with very small tool marks not polished out.
Surface of the mold will conform to good machine shop practice and no micro-inch finish will be specified. This is “Commerce Finish”.
RMA DRAWING DESIGN FOR FLASH EXTENSION
(T .000) No flash permitted on area designated. (Standard notation regarding other surfaces must accompany this notation.)
(T .003) This tolerance will normally require buffing, facing, grinding, or a similar operation.
(T.016) This tolerance will normally require precision die trimming, buffing or extremely accurate trimming.
(T .032) This tolerance will normally necessitate die trimming, machine trimming, tumbling, hand trimming, or tear trimming.
(T.063) This tolerance will be the normal tear trim tolerance.
(T.093) This tolerance will normally require die trimming, tear trimming, or hand trimming of some type.