FILENAMES:

center01.jpg
center02.jpg
center03.jpg

DESCRIPTION:

These are pictures of centering a workpiece on a lathe faceplate. 
Posted by Bucky Goldstein <bg@netcare.lucent.com>. Bucky provided 
the following description:

=================================================================

Someone was just asking how to center a workpiece on a punch mark
for accurate boring.  These shots illustrate a good way to do it.
Descriptions follow.  

	center01.jpg:	The workpiece is in the chuck.  The center
	gage is held against the punch mark by pressure from the
	tailstock.  The gage is tapered at the workpiece end with the
	same taper as my center punch.  The tailstock end is tapered
	to receive the tailstock center.  The gage is spring loaded
	to allow for some longitudinal compression from the
	tailstock.  The headstock end is hardened.  

	center02.jpg:	A dial indicator is mounted such that its
	pointer comes down on the vertical axis of the center gage.
	If the punch mark isn't centered, its eccentricity will show
	up on the dial.  The workpiece is adjusted accordingly until
	the dial shows no motion.  

	center03.jpg:	This is a close-up of the rig's business end.  
	
Note that in place of the gage you could use a spare dead center.
Put the point on your punch mark and hold the tail end in place
with your tailstock center.  Then use a dial indicator as above.