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Posted by mikecb1 on September 26, 2008, 6:20 am
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> Whenever I see recommended drilling and turning speeds I have always assu=
med
> the figures were maximum speeds, i.e. any speed below that figure is
> acceptable, but now I begin to wonder if they aren't also minimums as wel=
l.
> I understand the idea of not turning or drilling too fast in terms of
> surface feet per minute at the cutting tip to avoid excess heat generatio=
n,
> but can one really drill too slowly?
>
> I do realise that published figures are aimed at industrial applications
> where other considerations such as down time, tool durability etc. are
> important, so I must stress that I am not trying to replicate those speed=
s,
> I am trying to understand the principles behind them. Can anybody enlight=
en
> me?
>
> Cliff Coggin.
Cliff
As a relative amateur, I thought I'd wait for the experts to
respond. However, since no-one else had replied, my understanding is
that feed rate is the issue. The recommended speeds include some
assumed feed rate, and at speeds lower than those recommended it's
necessary to reduce the feed rate in proportion, otherwise the cut/
turn will be too great, and something will jam or break. As an
example, with very small drills run at low speed it's almost
impossible to manually feed slowly enough, and drill breakage is very
likely. Been there/done that.
Mike
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