Re: [CAD_CAM_EDM_DRO] Re: Plasma Spraying

Jerry,

Is this a typical South Bend lathe bed?

If so I can understand your reluctance to tackle
scraping the v-ways. Actually I should say hand grinding, as the ways are
hardened and cannot be
scraped conventionally.

Nevertheless I have seen many redone using prussian
blue, a pencil die grinder, straightedges, and a polymer casting replicated
from the ways used as
a guage. The casting is made from an unworn area
of the bed, typically from under the headstock or
near the tailstock.

I have also seen polymer materials used to build up
lathe ways.

As far as plasma spraying... well When ITW purchaced Miller Welding they had
a plasma spraying
business unit. I was sent up to check it out and write
some reports. Interesting process, but I don't think it
would be the best for building up worn machine bearing surfaces. It is hot,
nasty, creates porous
metal, and is typically non-ferrous. Someone might be
doing it but I have never seen it.

If you have been quoted $500 for regrinding the whole
bed I think that is a very good deal. There is other work to be done to the
carriage of course with shimming, scraping, and/or the application of
polymer
materials like Super Alloy, Moglice, or Turcite.

Also keep in mind that if tools are on the centerline,
even quite worn v-way beds can still give accurate
results when turning.

Les
Leslie M. Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
Engineering page:
http://www.alltel.net/~leswatts/shop.html
Surplus CNC for sale:
http://www.alltel.net/~leswatts/forsale.html

----- Original Message -----
From: turbulatordude <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, March 19, 2003 9:34 AM
Subject: [CAD_CAM_EDM_DRO] Re: Plasma Spraying


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jerry Kimberlin
> <kimberln@a...> wrote:
> > turbulatordude wrote:
> > > I spoke to a friend who things I would be well off trying to
> plasma
> > > spray the low spots in my lathe ways to build up rather than
> grind
> > > down.
> >
> > Without elaboration on this (which is probably off topic) I would
> > say you could investigate Moglice. Check the FAQ, etc. Others
> > have done this.
> >
> > JerryK
>
>
> Hi Jerry,
>
> I don't think that any type of method that might be used to either
> attain stratight and flat ways/slides/frames would be off topic.
>
> If you were to find that grinding a 4'x8' table as Les has laid out
> could be done in 1/10 the time if one was to fill the low spots
> first, then just polish off the high spots, that would be valuable to
> a lot of us.
>
> If you think about it, if you have a 2" wide beam 4 ft x 8 ft and
> need to lower 80% by 5 thou to level it, you would be grinding about
> 6 square feet, that is some work ! And addind metal is often more
> desirable then removing metal.
>
> In my reading, I have found that the lower limit is about 3 thou
> thickness. I'm not sure if one could feather that for something like
> a sliding surface or if it would peel or flake when it got that thin.
>
> Dave
>
>
>
>
>
>
>
>
> 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@...,
timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> 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/
>
>