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Posted by Guy Griffin on January 16, 2008, 8:30 am
Please log in for more thread options MikeH_QB wrote:
>>> Question from a beginner:-
>>> When should one use straight-fluted reamers and when
>>> should one use spiral-fluted ones ?
>> I have always worked on the basis that straight-fluted are for hand use, while
>> spiral ones are for machine use.
> So did I. But then if you look through various mail order catalogues,
> the distinction becomes a bit unclear. I've seen both spiral &
> straight described as hand and 'chucking'. (Have a look at 'Chronos'
> and 'Engineers toolroom' for example.) I think reamers with a helix
> generally cut easier than straight ones.
> For Jim's info, hand reamers will have a distinct taper 'lead in',
> where machine reamers have very little.
As far as I know: straight reamers are for general purpose and
fine/accurate cuts. Spiral reamers are for harder materials and
deep/interrupted cuts: the spiral doesn't jam so easily in a non-round
or interrupted hole, and shears the swarf away so it doesn't pack in the
flutes so much. Clearing swarf is important when machining, so I guess
that's why the spiral/helical form is preferred.
HTH
Guy
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>When should one use straight-fluted reamers and when
>should one use spiral-fluted ones ?
>
>Jim Hawkins