Re: [CAD_CAM_EDM_DRO] Bridgeport spindle bearings - do they like it when you snap end mills?
Posted by
Jon Elson
on 2001-07-06 21:27:36 UTC
garyswindell@... wrote:
head without any noticable damage. This was generally with the spindle
NOT turning, I don't know if that makes the damage worse or less.
I suspect that the solid carbide tool took more force before it let
go. Undoubtedly, you have "Brinelled" the races, and probably dented
a couple of the balls, too.
I have heard new (and newly rebuilt) spindles at work, and they are VERY
quiet! You just about couldn't tell the difference between the motor
running in neutral and the spindle running at about 2500 RPM. Above
that, there is a slight whirring sound, probably not the spindle bearings
but the back gear and other stuff.
I've also heard older machines that were still turning out excellent work
make a LOT of noise. (Some of that could be the back gear and other
parts in the head, that have cheap bearings in them.)
Jon
> I have a question about the proper amount/type of noise spindleI've broken off a couple 3/8" HSS end mills in the spindle of a 1-J
> bearings should make. I have a Brideport Series I CNC machine with
> the rigid ram.
>
> Before tonight if the speed was up around 3400 RPM you could "hear"
> the bearings "whirring" around. Nothing scratchy or loud.
>
> Tonight I snapped a 3/8" carbide end mill trying to rapid while an
> inch deep in aluminum (accident). Now I would say the bearing noise
> has changed. Still not what I would call loud, but certainly
> different.
>
> So what kind of noise is normal, and do you damage anything by
> breaking off end mills like this?
head without any noticable damage. This was generally with the spindle
NOT turning, I don't know if that makes the damage worse or less.
I suspect that the solid carbide tool took more force before it let
go. Undoubtedly, you have "Brinelled" the races, and probably dented
a couple of the balls, too.
I have heard new (and newly rebuilt) spindles at work, and they are VERY
quiet! You just about couldn't tell the difference between the motor
running in neutral and the spindle running at about 2500 RPM. Above
that, there is a slight whirring sound, probably not the spindle bearings
but the back gear and other stuff.
I've also heard older machines that were still turning out excellent work
make a LOT of noise. (Some of that could be the back gear and other
parts in the head, that have cheap bearings in them.)
Jon