Re: [CAD_CAM_EDM_DRO] ballscrew swarf protector

I have heard them called "Negators" which I think is a trade name for a
constant force spring.

Were used to balance an overhead X-Ray tube support in verticial travel.

Were a Bi**h to install and came in different lengths, widths and thickness.

Hugh

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, October 29, 2005 2:46 PM
Subject: Re: [CAD_CAM_EDM_DRO] ballscrew swarf protector


> Paul Kelly wrote:
>
> >I'm having some difficulty keeping swarf out of my lathes Z axis ball
screw.
> >My installation has it running up the center of the bed, tidy but ALL the
> >mess goes there!
> >I've tried various saddle aprons and even built a lobster tail
arrangement,
> >however they all seemed to limit the saddle travel at the worst possible
> >time..
> >I have some space under the headstock (which bolts onto the bed), and was
> >thinking of one of those spring steel coil thingys (ie question 1 is;
"can
> >anyone give me the correct term for these")
> >
> >
> I think that is a "rollator" spring, also known as a constant-tension
> spring. The problem
> is you still need a wiper for the spring, or it will jam. The advantage
> of this is
> it needs very little room at the end of travel. It is basically like a
> roll-up steel measuring
> tape. In fact, there are some wider steel tapes, like 1.5", that have
> been used for
> this purpose. I think they use a little brush to clear the chips. As
> long as the tape
> is a little wider than the screw, it should prevent any chips from
> falling on the screw.
>
> Or, are you talking about the helical overlapping spring that telescopes
> around the
> screw? I think you'll find this also takes up a significant amount of
> room at the end of
> travel. They work great, and are pretty self-cleaning, but chips do get
> into the
> screw as the spring works back and forth. Oh, if there's no bearing at
> the headstock
> end, then you can mount the end as far back as it needs to be. I have
> no idea where
> to get these.
>
> Jon
>
>
>
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