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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