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Posted by Charlie Gary on April 27, 2006, 4:22 pm
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Joe AutoDrill wrote:
> > Thanks for the chart. I have one question. Is there a reason the feed
> > for a one inch drill in plastic is less than the feed for the same
> > drill in low carbon steel or aluminum?
>
> All the numbers on the multi-drill.com chart are what I call "safe" numbers.
> They are for the guy or gal trying to set up a machine that is not
> programmable like a CNC machine would be. They are all well below the
> thresholds of there problems would normally occur and take into account that
> the average Joe isn't using perfectly sharp tools or super-rigid machines.
>
I should have been able to finger that one out myself ;-)
Seeing wood and plastic lumped together should have clued me, 'cause
even I know you can't drill glass filled nylon as fast as you can MDF.
> ...In other words, they are roughly the numbers we use for our machines
> which cost low thousands VS tens of thousands or more for larger, more
> capable and more highly controllable machines.
>
> All speculation aside, I simply don't know why... Someone with materials
> expertise might be able to answer with a definite answer.
>
But your answer about it being a ballpark chart was good enough for me.
> You did peak a different question for me though... Why is the stainless so
> low? Stainless ruins tools by holding heat near the tool - so many folks
> get better results with deep, heavy cuts in cooler material. NOT on my
> machines per say, but only because mine aren't made for very heavy
> applications.
Funny how heat keeps rearing its head when the quality of the cut comes
into question. It doesn't get talked about enough. People just keep
wasting it (hot air) debating useless issues. :-)
Later,
Charlie
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> the recomended speeds and feeds for Mild Steel, 316 stainless and
> aluminium (304 stainless would be handy as well).