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Posted by Pete C. on March 22, 2006, 5:24 pm
Please log in for more thread options Rex B wrote:
>
> Lloyd E. Sponenburgh wrote:
> >> I have an 11 inch diameter 1/4" thick 304 ss disk, no matter what I
> >> try I get chatter, anyone do this? I need both sides flat and
> >> parallel. 4" hole in center. no combination of feeds and speeds got
> >> rid of the chatter. it has some holes through it and they seem to set
> >> up chatter. I was chucked on the OD.
> >
> > Embed the disk in a thin 'tray' of fixturing metal. It should help damp
> > vibration.
> >
> > Or... adhesive laminate a sheet of lead to the backside before chucking.
>
> Toolpost grinder.
> SFM at the center is going to be much lower than the outside. Hard to
> setup a single point cutter for that kind of range.
That gives me an interesting / odd idea. With the availability of
inexpensive VFDs that at their simplest can take their speed setting
from an analog voltage, it seems it would not be impractical to attach a
sensor to the lathe cross slide or possibly tool holder to setup a
constant linear velocity drive.
Pete C.
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> try I get chatter, anyone do this? I need both sides flat and
> parallel. 4" hole in center. no combination of feeds and speeds got
> rid of the chatter. it has some holes through it and they seem to set
> up chatter. I was chucked on the OD.
>
> any thoughts?
>
> Tool post grinder? double sticky tape to a rotarty table on the
> surface grinder? (grinder not big enough to do the whole thing)
> Thank You,
> Randy
>
> Remove 333 from email address to reply.
>