1. Lack of rigidity in set up of machine.
2. Excessive clearance on blades.
3. Insufficient reaming stock.
4. Too little back taper on blades.
5. Dull cutting blades.
6. Improver speed to feed ratio.

Solutions

1. Check holding of part, loose slides or machine gibs.
2. Reduce clearance angle on blades by grinding 3o to 5 o primary.
3. Increase reaming stock allowance.
4. Increase back taper.
5. Regrind or replace blades.
6. Alter the speed to the feed, changing one or both to find best ratio.

1. Rough finish, tearing or guaged hole threadlike finish.

1. Increase top rake of blades.
2. Decrease feeds.
3. Break sharp edge of chamfer by horning with slight radius.
4. Insufficient coolant supply or wrong coolant.
5. Grind shave angle 3 degree x 1mm long behind chamfer angle.

1. Misalignment beyond float limit of reamer.
2. Cutter blades not floating or locked solid.
3. Chamfer not alike on blades or blades or blades not ground correctly. Cut is not properly balanced.
4. Part picking up heat.
5. Picking on blades (built up edge)
6. Lock ring not tight. Blades expand and cut oversize.
7. Worn ways or slides or machine.

1. Indicate reamers or holders and spindle for permissible run-out.
2. Check blades for burrs or chips. Grind 0.05 mm. back edge of blade to ensure end cap not locking blades.
3. Regrind or replace blades.
4. Use sufficient and proper coolant. Reduce speed.
5. Improve grind finish or blades. Increase top rake, Remove sharp edges by light honing on cutting edge.
6. Tighten up the lock ring.
7. Install reamer in position of greatest error of machine IMPORTANT. Error must be within float limit of reamer. Realign holders to true position.

1. Too great speed.
2. Material too hard or hard spots.
3. Improper lubrication.
4. Tool geometry.
5. Cutting blade material.

1. Check for proper blade material (High Speed or Carbide).
2. Check material and hardness.
3. Check coolant, applicant, and coolant type.
4. Check grinding of blades.
5. Proper grade of carbide.