RE: [CAD_CAM_EDM_DRO] Bishop Wisecarver linear slides

Hmm... I think you may have a very good point [no pun intended] about the
amount of surface contact. At any one moment there will be only 4 bears
making downwards contact -- very little metal to metal contact. A more
conventional linear slide would be much better. I was thinking compactness
and ease of installation.

I took another look at my ways. I would want two 500mm - 600mm rails, with
a stroke length of at least 400 mm, straddling both the front side. My
intent is to make the linear sliders mount to the accessory grooves,
straddling both the front and back of the lathe. Then make my own X axis,
mount that on top of the linear sliders.

The reason why I want to have the sliders straddle the lathe is because I
sometimes make very small pieces, and I need my tailstock to sit in close to
the head stock. That is why I don't want to have anything sitting in the
middle of the ways, with the exception of the X axis way/linear slides.

I'm curious as to what success/failures people have experienced with
conventional linear ball bearings, as well as Teflon/felon lined linear
bearings.

Cheers






-----Original Message-----
From: JanRwl@... [mailto:JanRwl@...]
Sent: December 19, 2002 16:17
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Bishop Wisecarver linear slides

In a message dated 12/19/2002 10:02:59 AM Central Standard Time,
lloyd@... writes:

> The type of linear slides I'm thinking of using are the DualVee linear
> tracks from Bishop Wisecarver www.bwc.com <http://www.bwc.com/> they are
> moderately priced [a few hundred Canadian dollars]
>
> I am not affiliated with BWC in any capacity. I just found their system
> very simple. I would like to hear from anyone their thoughts on their
> products.

Lloyd: The DualVee stuff is very precision, and "well-made" (and BW is VERY

proud of their stuff! Don't you mean, "many hundreds of C.$???). I built
two plotters for a CNC purpose, using BW DualVee for the longer X-axis
(Thomson "Super" linear ball-bearings for the Y-axis), and it is very fine,
but WOW! Over $400 US for the two 18" ways and six "V wheels" with studs?

I wish now I had investigated THK or the like. There are some ROLLER-type
linear bearings and ways which I think would be better suited to the kind of

forces in a lathe, even one cutting only plastics, etc! In the BW DualVee,
all the force is transmitted to just two "lines" on the V about 2 mm long,
not much "steel-to-steel". With some of the linear bearings using special
four-groove "ways", there would be MANY bearings making contact, and with
the
roller-type (THK as well? I forget, now.), there would be much more
support.


Seems if there's "room" to install ways of this kind, there'd be room to
install some kind of "substitute ways" that the PRESENT saddle could ride
on!
Sliding "V-ways" support much more force for longer than even the best of
the above. The only indications for ball- or roller-linear bearings would
be
where you need as close to "friction-free" as possible, or "best precision,
but with NO load-force to speak of" (such as for optical applications, or
office-machinery, etc.). Or, for "build it from scratch"
application-specific "one-off" machinery, NOT "retrofit".

Lotsa luck! Jan Rowland


[Non-text portions of this message have been removed]


Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
Moderator: jmelson@... timg@... [Moderator]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/