Re: RE: [CAD_CAM_EDM_DRO] Re:Lapping

Ted,

There is on www.machinerepair.com a book and video
they sell about scraping (plus some video clips). There is
also a book (don't remember the exact title) on machine
reconditioning which goes into depth on scraping.

The process is using a scraper (purchased or made from a file)
to scrape surfaces to a flat condition.

George

----- Original Message -----
From: "Ted Gregorius" <ted@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, March 24, 2005 3:42 PM
Subject: Re: RE: [CAD_CAM_EDM_DRO] Re:Lapping


>
> Hey Guys. I'm completely ignorant about this lapping and scrapping stuff.
Although I believe I understand the methods and pitfalls of lapping (did a
few telescope mirrors many years ago) could someone explain what hand
scraping is.
>
> I have heard the term many times and it's obviously a good thing to have
hand scrapped ways on your machine. How is it done?
>
> Thanks
>
> Ted
>
> ----- Original Message -----
> From: Roger Hampson
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: Thursday, March 24, 2005 3:34 PM
> Subject: [Norton AntiSpam] RE: [CAD_CAM_EDM_DRO] Re:Lapping
>
>
>
>
>
> Bruce
>
> Excellent answer !!!
>
> Roger
>
> -----Original Message-----
> From: Bruce Pigeon [mailto:bwpigeon@...]
> Sent: 24 March 2005 20:29
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re:Lapping
>
>
>
> IMHO lapping in this case is trying to make a silk purse out of a pigs
ear.
>
> All of your aruguements have their merits and their places. I have
seen
> many gunsmiths use many different processes to rework or so called
> repair a gun. Not all of these methods would be deemed acceptable.
> So does that make lapping the correct way to repair this machine? I
don't
> think so. I have hand scraped more cast iron in my life than I want to
> think
> about, never have I tried to lap a pair if ways to correct them, it
won't
> work.
> I also have lapped many things that should not be scraped. Learning and
> knowing when and where to use each method is important. If you don't
have
> a mentor to to ask and help you, you are left to other means like these
> forums.
> If your hear all of the arguements and pick the wrong solution, you will
> learn
> the hard way. Your best tool is good judgement and common sense in
> selecting
> the right process. Don't look for a short cut. Choose wisely
Grasshopper.
>
> Just my opinion.
>
> Bruce
>
> -------Original Message-------
>
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> Date: 03/24/05 13:12:16
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re:Lapping
>
>
>
> Andy Wander <awander@...> wrote:
>
> If lapping can only be done with a lap, and using lapping compound on 2
> mating surfaces to smooth them up NEVER makes things better, why do
custom
> gunsmiths working on tightening up the slide-to-frame fit on auto
pistols
> use this technique?
>
> Ron, I think you're being a little TOO adamant on this point.
>
> /// Or TOO realistic. Comparing the alloys and toolsteels gunmakers use
to
> chinese cast iron, there isn't much comparison. Marcus is exactly right,
to
> do this without a means of verifying the concerns to begin with and
means of
> monitoring the progress and end result is a gamble at best. Would be
> virtually impossible to maintain the precision of the machine. The
problem
> exists with the cast iron itself and the method in which it was
finished.
> Cast iron and steel as you know have hard and soft spots. The soft areas
are
> going to be abraded away by the compound at a much faster rate. Now the
> machined finish: To lap these two surfaces with one another and any
degree
> of accuracy and not have a method of verifying. one must ascertain that
the
> machine finish is constant throughout the entire surface meaning the
same
> number of peaks and valleys of machine tool marks. An area of less
surface
> density will wear away faster as well. When surface grinding a surface
after
> machining will demonstrate
> this especially in the case of a fly cutter that tends to crown the
> surface.
>
> And all of this when re-assembled must maintain 90 degress from the X
and Y
> plane to the centerline of the spindle (many of these machines have no
means
> of adjusting the tram). Then the bottom of the saddle must be parallel
to
> the top. The X and Y centerlines must be 90 degrees to one another.
dovetail
> to dovetail parallel etc. etc. Alot of things to keep track of and check
> along the way.
>
> Just my opinion, If it was TOO adamant, I apologize,
>
> Ron
>
> /////
>
>
>
>
>
> Andy Wander
> Verrex Corporation
>
> -----Original Message-----
> From: Tom Hubin [mailto:thubin@...]
> Sent: Thursday, March 24, 2005 9:07 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re:Lapping
>
>
> > In fact,
> > telescope makers make their mirrors by grinding two surfaces together
to
> > make them curved.
>
> And alternating two of three surfaces to grind all three flat.
>
> Tom Hubin
> thubin@...
>
>
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