Cutting Inserts
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RT321

ROTLLER cutting insert 9.52 mm - radius 0.4 mm

RT321 (General purpose and sleeving)

A 3/8" (9.52 mm) IC triangular insert with a black ceramic coating and 1/64" (.4 mm) cutting radius. This insert is the best to use for counterboring when the small corner radius is required for clearance or when the machine is at its extended travel limits. The 1/64" (.4 mm) radius should be used when machining to a step where the mating part requires a smaller radius to eliminate an interference problem in the radius. If you are machining a long bore where the spindle must be extended towards the limits of its travel or if a long stub bar is being used, the 1/64" (.4 mm) radius will minimize the possibility of chatter. A feed rate of .002" - .005" (.05 mm - .12 mm) per revolution should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002" - .004"/rev (.02 mm-.1 mm/rev) should be used. When cutting gray cast iron use a speed in the 800 – 1200 S.F.P.M. area for best productivity and tool life.

When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4" (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast irons, is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006 and .010 (.15 mm and .25 mm) per revolution.

RT322

ROTTLER cutting insert 9.52 mm - radius 0.8 mm

RT322 (General purpose and sleeving)

This is the same insert as RT321, except it has a 1/32" (.8 mm) radius. This insert is the best to use for heavy sleeve cutting and can also be used for general machining and counterboring. This larger radius insert will give a smoother finish for a given feed rate when sleeve cutting to allow easier sleeve fitting and closer metal to metal contact for heat transfer. It is possible to use a feed rate that is 30% faster with the RT322 compared with the RT321 and still obtain the same finish. The 1/32" (.8 mm) radius is stronger than the 1/64 (.4mm) radius of the RT321. The RT322 should always be used for heavy sleeve cuts unless the finish part requires the smaller radius for clearance or you are cutting a long bore. The larger radius creates more tool pressure than the small radius. The increased tool pressure may cause chatter in the finish if machining very long bores. A feed rate of .006" - .012" (.15 mm - .3 mm) per revolution should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002" - .004"/rev (.05 mm-.1 mm/rev) should be used. When cutting gray cast iron use a speed in the 800 – 1200 S.F.P.M. area for best productivity and tool life.

When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4" (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast irons, is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006" and .010" (.15 mm and .25 mm) per revolution.

RT211

ROTTLER cutting insert 6.35 mm - radius 0.4 mm

RT211 (General purpose and sleeving)

A ¼" (6.35 mm) IC triangular insert with a black ceramic coating and 1/64" (.4 mm) cutting radius. The 1/64" (.4 mm) radius should be used when machining to a step where the mating part requires a smaller radius to eliminate an interference problem. If you are machining a long bore where the spindle must be extended towards the limits of its travel or if a long stub bar is being used, the 1/64" (.4 mm) radius will minimize the possibility of chatter. A feed rate of .002" - .005" (.05 mm - .12 mm) should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002" - .004"/rev. (.05 mm - .1 mm/rev) should be used. When cutting gray cast iron use a speed in the 800 – 1200 S.F.P.M. area for best productivity and tool life.
When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4” (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast irons, is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006” and .010” (.15 mm and .25 mm) per revolution.

RT212

ROTTLER cutting insert 6.35 mm - radius 1.6 mm

RT212 (General purpose and sleeving)

This is the same insert as RT212, except it has a 1/32" (1.6 mm) radius. This larger radius insert will give a smoother finish when sleeve cutting to allow easier sleeve fitting and closer metal to metal contact for heat transfer. The 1/32" (1.6 mm) radius is stronger than the 1/64 (.8 mm) radius of the RT321. The RT322 should always be used for sleeve cuts unless the finish part requires the smaller radius for clearance or you are cutting a long bore. The larger radius creates more tool pressure than the small tool radius. The increased tool pressure will create chatter in the finish. A feed rate of .006" - .012" (.15 mm - .3 mm) per revolution should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002" - .004"/rev. (.05 mm -. 1 mm/rev) should be used. When cutting gray cast iron use a speed in the 800 – 1200 S.F.P.M. area for best productivity and tool life.

When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4" (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast iron is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006" and .010" (.15 mm and .25 mm) per revolution.

RT321F

ROTTLER cutting insert 9.52 mm - radius 0.8 mm

RT321F (Precision Counterboring and Finishing)

A 3/8" (9.52 mm) IC triangular, uncoated insert with a 1/64" (.8 mm) cutting radius. Gives the best finish results when machining precision counter bores often machined in diesel engine blocks. The 1/64" (.8 mm) radius should be used when machining to a step where the mating part requires a smaller radius to eliminate an interference problem. If you are machining a long bore where the spindle must be extended towards the limits of its travel or if a long stub bar is being used, the 1/64" (.8 mm) radius will minimize the possibility of chatter. A feed rate of .002" - .005" (.05 mm - .12 mm) should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002 - .004/rev. (.05 mm - .1 mm/rev) should be used.

When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4" (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast iron is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006" and .010" (.15 mm and .25 mm) per revolution.

RT322F

ROTTLER cutting insert 9.52 mm - radius 1.6 mm

RT322F (Precision Counterboring and Finishing)

A 3/8” (9.52 mm) IC triangular, uncoated insert with a 1/32” (1.6 mm) cutting radius. Gives the best finish results when machining precision counter bores often machined in diesel engine blocks. A feed rate of .004” - .008” (.05 mm - .1 mm) should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002 - .004/rev. (.05 mm - .1 mm/rev) should be used. When cutting gray cast iron use a speed in the 300 - 800 S.F.P.M. area for best productivity and tool life. Tool life of this insert is significantly less than the RT322.

RT211F

ROTTLER cutting insert 6.35 mm - radius 0.8 mm

RT211F (Precision Counterboring and Finishing)

A ¼" (6.35 mm) IC triangular, uncoated insert with a 1/64" (.8 mm) cutting radius. Gives the best finish results when machining precision counter bores often machined in diesel engine blocks. The 1/64" (.8 mm) radius should be used when machining to a step where the mating part requires a smaller radius to eliminate an interference problem. If you are machining a long bore where the spindle must be extended towards the limits of its travel or if a long stub bar is being used, the 1/64" (.8 mm) radius will minimize the possibility of chatter. A feed rate of .002 - .005 (.05 mm - .12 mm) should be used to obtain a typical surface finish. When machining large counter bores typically found in Cummins or Cat Blocks, a feed rate of .002 - .004/rev. (.05 mm - .1 mm) should be used. When cutting gray cast iron use a speed in the 300 - 800 S.F.P.M. area for best productivity and tool life. Tool life of this insert is significantly less than the RT211

RS322

ROTTLER cutting insert 9.52 mm square

RS322 (for high speed oversize through boring) A 3/8” (9.52 mm) IC, square insert with a black ceramic coating. It is used on Rottler boring machines for through boring when removing .010” - .060” (.25 mm - 1.5 mm) on the diameter. A very economical insert as it has 8 cutting edges. On a 4” (100mm) bore use 1000 - 1200 RPM and a feed rate of .008” - .012” (.2 mm - .3 mm) per rev feed rate to obtain the typical surface finish. The insert can also be used for sleeve cuts when a square step is not required. For example, when used on an F80 or F5 machine it can be run at 1000 – 1200 RPM and .005/rev (.12 mm/rev) feed rate to remove up to .200” (5 mm) on the diameter from a 4.200” (106 mm) bore. When cutting nodular, ductile, or compacted graphite cast iron the speed should be in the 200 – 400 S.F.P.M. area – 300 RPM on a 4” (100 mm) diameter bore. Nodular, ductile, or compacted graphite cast iron is found most often in high performance engine blocks or sleeves. When cutting these tuff cast irons it is best to use a feed rate of between .006” and .010” (.15 mm and .25 mm) per revolution.