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Posted by Robert Swinney on April 19, 2006, 3:33 am
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Good one, Tom! Wonder how many readers had to go to the dictionary?
Bob (erudition is not me) Swinney
>
>> Really? I'd bet most would say they can get a better finish climbing
>> than conventional anytime. Do you machine dry?
>> -- Randy Replogle
>
> Randy, we've all been asked not to tease Robin about his hyperhidrosis,
> you are SO mean!
>
>
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Posted by Robin S. on April 19, 2006, 9:18 pm
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> Good one, Tom! Wonder how many readers had to go to the dictionary?
>
We had radio commercials in Southern Ontario about "hyperhidrosis" recently.
I now understand it's treatable and that one doesn't need to be
embarrassed...
I can't wait until August. They give out freezies on the shop floor when the
temp goes over 35ºC. Even better when working in presses with no ventilation
(don't want to blow dust onto the panels) and the 50+HP motors. Sometimes
the presses get so hot they shut themselves down before they get damaged. If
we could all be so lucky... We're supposed get water ever 20min, thirsty or
not.
Regards,
Robin
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Posted by Eric R Snow on April 19, 2006, 10:29 am
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>
>> I always take it all in one pass. Actually, I climb mill and then
>> conventional mill at the same setting when using a manual mill.
>
>Did you mean to write this? I virtually never climb mill on a manual
>machine, even for finishing. I find I never get a really great finish
>anyway, and if a good finish is required in die making, the surface is
>typically ground or stoned.
>
>Regards,
>
>Robin
>
Robin,
I read what I wrote. And yes, it's accurate. I'm surprised you don't
climb mill on manual machines. I almost always climb mill. Easier on
cutters, better finish, the tool deflects away from the work so that
parts aren't cut undersize when heavy cuts are being used. Actually,
steel oftentimes will have a better finish after a conventional cut,
but aluminum and brass look better after climb milling. So when
milling steel I usually climb mill first and then conventional to get
a good finish. This of course is when a relatively heavy cut is being
taken.
ERS
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Posted by Robin S. on April 19, 2006, 9:05 pm
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> I read what I wrote. And yes, it's accurate. I'm surprised you don't
> climb mill on manual machines. I almost always climb mill. Easier on
> cutters, better finish, the tool deflects away from the work so that
> parts aren't cut undersize when heavy cuts are being used. Actually,
> steel oftentimes will have a better finish after a conventional cut,
> but aluminum and brass look better after climb milling. So when
> milling steel I usually climb mill first and then conventional to get
> a good finish. This of course is when a relatively heavy cut is being
> taken.
Maybe I've been spending too much time with a disc grinder and not enough
time on a mill but I would never *ever* recommend that someone climb mill on
a manual milling machine when taking a cut which could be described as
"heavy."
This is an excellent way to break a cutter and ruin the work piece, not to
mention making the whole table (assuming a Bridgeport-type machine) jump
violently. Indeed I snapped a 1" roughing endmill and nearly toasted an O1
punch by carelessly approaching the work from the wrong direction (climbing)
earlier this week.
I always run the machine to the point of the spindle audibly slowing down,
assuming the cutter will take it. I've taken about a half a dozen full time
machining courses through and before my apprenticeship, and we have never
been taught to ever climb mill on a manual machine, although it has been
suggested with a low voice (although never written!) that one can climb mill
while taking a *light* finishing pass.
Climb milling is standard on CNC machines for the reasons above, but they
are capable of safely climbing only because of their near zero-backlash
ballscrews. Obviously manual machines do not have that option.
I suppose anyone is allowed to run their own machine however they want, but
I can't imagine anyone consciously choosing to always climb. Other than
perhaps rich adrenaline junkies...
Regards,
Robin
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Posted by Eric R Snow on April 20, 2006, 9:15 am
Please log in for more thread options wrote:
>
>> I read what I wrote. And yes, it's accurate. I'm surprised you don't
>> climb mill on manual machines. I almost always climb mill. Easier on
>> cutters, better finish, the tool deflects away from the work so that
>> parts aren't cut undersize when heavy cuts are being used. Actually,
>> steel oftentimes will have a better finish after a conventional cut,
>> but aluminum and brass look better after climb milling. So when
>> milling steel I usually climb mill first and then conventional to get
>> a good finish. This of course is when a relatively heavy cut is being
>> taken.
>
>Maybe I've been spending too much time with a disc grinder and not enough
>time on a mill but I would never *ever* recommend that someone climb mill on
>a manual milling machine when taking a cut which could be described as
>"heavy."
>
>This is an excellent way to break a cutter and ruin the work piece, not to
>mention making the whole table (assuming a Bridgeport-type machine) jump
>violently. Indeed I snapped a 1" roughing endmill and nearly toasted an O1
>punch by carelessly approaching the work from the wrong direction (climbing)
>earlier this week.
>
>I always run the machine to the point of the spindle audibly slowing down,
>assuming the cutter will take it. I've taken about a half a dozen full time
>machining courses through and before my apprenticeship, and we have never
>been taught to ever climb mill on a manual machine, although it has been
>suggested with a low voice (although never written!) that one can climb mill
>while taking a *light* finishing pass.
>
>Climb milling is standard on CNC machines for the reasons above, but they
>are capable of safely climbing only because of their near zero-backlash
>ballscrews. Obviously manual machines do not have that option.
>
>I suppose anyone is allowed to run their own machine however they want, but
>I can't imagine anyone consciously choosing to always climb. Other than
>perhaps rich adrenaline junkies...
>
>Regards,
>
>Robin
>
Robin,
I suppose I am ruining the mill. I mean it's only 25 years old and
already there is a little more backlash in the center of travel.
Perhaps you were never taught to climb mill on a bridgeport, or taught
to never climb mill on a Bridgeport. But please don't assume I am
ruining a machine. I've only been machining metal for 30 years or so
and maybe you have more experience than me. Still, you should maybe
watch me climb milling and see if it works well or not.
ERS
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