Reaming
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| - | Reaming is the process of enlarging a hole or a bore to an exact diameter. Reaming can also be used to smooth out a hole or a bore. The tool used for reaming is called a reamer. Reamers are fluted, edge cutting tools that come in two flavor -- machine/chuck reamers and hand reamers. | + | Reaming is the process of enlarging a hole or a bore to an exact diameter. Reaming can also be used to smooth out a hole or a bore. The tool used for reaming is called a reamer. Reamers are fluted, edge cutting tools that come in two flavor -- machine/chuck reamers and hand reamers. Chucking reamers can be used in lathes, drill presses, and screw machines. Hand reamers have a square drive and can be turned with a wrench. |
| - | Generally, reaming is done after the machinist drills a hole at a slightly smaller size. The difference between the reamer's diameter and the drill's diameter is called the allowance. Modern drills are relatively precise but the use of | + | Generally, reaming is done after the machinist drills a hole at a slightly smaller size. The difference between the reamer's diameter and the drill's diameter is called the ''allowance''. Modern drills are relatively precise, but the use of reamers allow for the machinist to produce a near perfect hole. |
Revision as of 21:14, 9 September 2007
Reaming is the process of enlarging a hole or a bore to an exact diameter. Reaming can also be used to smooth out a hole or a bore. The tool used for reaming is called a reamer. Reamers are fluted, edge cutting tools that come in two flavor -- machine/chuck reamers and hand reamers. Chucking reamers can be used in lathes, drill presses, and screw machines. Hand reamers have a square drive and can be turned with a wrench.
Generally, reaming is done after the machinist drills a hole at a slightly smaller size. The difference between the reamer's diameter and the drill's diameter is called the allowance. Modern drills are relatively precise, but the use of reamers allow for the machinist to produce a near perfect hole.
The Necessity of Reamers
With a standard drill bit, tolerances of .002" can be met while improved drill bits can get tolerances of .001". These tolerances may not be good enough for certain engineering applications which is why reamers are necessary. Reamers have diameter tolerances of +0.0002/-0.0000 for sizes up to 1/2", and +0.0003/-0.0000 for sizes 1/2 thru 5/8".
Sources:
http://en.wikipedia.org/wiki/Reamer
http://www.cutting-tool.americanmachinist.com/guiEdits/Content/bdeee16/bdeee16_1.aspx
http://www.mcmaster.com/ctlg/DisplCtlgPage.aspx?ReqTyp=CATALOG&CtlgPgNbr=2430&term=About%2bChucking%2bReamers&sesnextrep=442618588470951&ScreenWidth=1024&McMMainWidth=817
http://reviews.ebay.com/Reaming-Practices_W0QQugidZ10000000002397670
Charles Yee, Luke Miller, Terry Chau
