CAD CAM EDM DRO - Yahoo Group Archive

turcite bed ways

on 2001-04-21 09:09:34 UTC
Hello Friends,
I first had to sleep it over and analyze the problem of the turcite bed
ways
I mentioned yesterday.
Therefore first some explanations and then one possible solution I would
like
to discuss.

I got in contact with bed way scraping in various occasions since teenager.
Since I opened my machine shop in 1990 I had to deal with it frequently
and since 1995 it became an important part of my daily bred.
It is a business were you have to observe and analyze very particulous
and need good manual craftsmanship.
Only time will tell the truth whether you worked well.
Luckily I had already a few dozens cases to learn from.
But I admit that I never learned it in a professional way.
What counts are the results. All the machines I worked on except two
are still in good shape and working well. (1 contaminated with grinding
dust /
the other case

Damn it!! The new netscape 6 failed and I lost 1 hours writing where
I explained techniques with metal bed ways!!

...The other case is the CNC lathe with turcite bed ways we deal her with.

It is after a few dozens of scraped bed ways the first and only turcite
bed ways
I rebuilt in my life. I adjusted quite a few gibs made of turcite. But
only this one
Spanish JATOR CNC lathe I rebuilt the bed ways two years ago.

The original turcite lasted 8 years my ones only 2!
The chips ate up the turcite!
I suspect because I entered from the point of view of my experience with
metal bed ways and the following design items.
The CNC lathe is out of reasonable quality, it is built for medium
size batch work where the necessary tool posts are put on the dove tail
cross way. It works 8 to max. 16 hours a day in a kind of pulley factory.
There are no wipers on the cross slide because the space is too tight.
There is only one accordion protector on the operators side that
is not hermetic. On the servo motor side there is only a small chip pan and
a horizontal cover for the servo. On this cover chips get accumulated.
When the cross way passes over it, it caches chips and pulls them into the
cavity of the ball screw and forces them into the turcite. The turcite
would not
liberate the the chips as easy as metal bed ways. Where debrids get
caught in the
lubrication grooves.
Opposite seems to be the case: In turcite the debrids seem to get
caught easier at the grooves.

I think of the following solutions:
First: Make no lubrication grooves at the parts that travels over the edge!
Second: Although there is only very little space at the end make wipers
at the ends with commercial rubber wipers backed up with felt!
These wipers will face the turcite and not the base as normally.
Third: Put on the cross slide and the base at the edges small air nozzles
that blow away chips and debrids.

Has anybody more experience with the turcite and better ideas to prevent
the auto destruction of this lathe?

Please answer on the list because it is important for many of us.
Thank you very much
Sven Peter

Discussion Thread

Sven Peter, TAD S.A. 2001-04-21 09:09:34 UTC turcite bed ways Roland Friestad 2001-04-21 10:34:28 UTC Re: turcite bed ways Sven Peter, TAD S.A. 2001-04-21 18:24:47 UTC Re: [CAD_CAM_EDM_DRO] Re: turcite bed ways