In part 6 we know that hand reamer and machine reamer are similar in function, and hand reamer has longer lead in while machine reamer shorter, and both flutes can be straight or spiral. Here we explain another two tungsten carbide reamers: rose reamer and tapered reamer.

 

Rose reamer

A rose reamer has no relief on the periphery and is offset by a front taper to prevent binding. They are secondarily used as softening reamers.

 

Tapered reamer

A precision tapered reamer is used to make a tapered hole to later receive a tapered pin. A taper pin is a self tightening device due to the shallow angle of the taper. They may be driven into the tapered hole such that removal can only be done with a hammer and punch. They are sized by a number sequence (for example, a No.4 reamer would use No.4 taper pins). Such precision joints are used in aircraft assembly and are frequently used to join the two or more wing sections used in a sailplane. These may be re-reamed one or more times during the aircraft's useful life, with an appropriately oversized pin replacing the previous pin.