Re: Bridgeport Ballscrew Backlash

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mike Phillips"
<mikep_95133@...> wrote:

>
> I'd be shocked if that Boss had worn out ball screws. Did you check
> the backlash in the middle and at both ends of travel?

I have heard of them wearing. This machine's hour indicator
was maxed out at 10,000 hours. Who knows how many more
hours are on it.

> Are you using a
> test indicator to see what the endplay is in each axis when you
> push/pull on the handle?

Machine has no handles.

>
> The ways on a Boss are far wider than stock. Is the flaking or chrome
> still uniform in appearance all over each way surface?

Wear is not completely uniform. This I have found to be normal.
No spot is worn to the point that the flaking is gone, or the
chrome for that matter. This is why I decided not to rescrape
it.

>
> Make sure the ways and ballscrews are extrememly well lubricated
> before you measure endplay or backlash. Dry machines can cause
> intermittent results that make tracking them down a bear.

I let the pump run until machine was dripping after I reassembled
it. It still is dripping.

Scott