开云体育

In my opinion, the vertical surface of the bed least likely to have any significant wear since new is the rear of the front way.? To check alignment against that surface you will need

?

(1)??? a dial indicator somehow attached to a piece of steel angle (whose inner corner has been relieved slightly) and at a height to put the plunger on center.?

(2)??? A length of precision ground round bar about 12” long or longer.?

(3)??? A means of holding the round bar in the spindle.

?

Zero the indicator at the headstock end of the round bar while holding the vertical surface of the angle firmly against the rear of the front way.? Slide the angle down to the right end of the bar and note the reading.? In a perfect world, the reading would still be zero if the spindle axis is parallel to the bed axis.

?

In the real world, there will probably be runout and wobble.? To get a handle on these, at a minimum you would need two indicators, the one at 9:00 and a second one at 12:00.? I would zero the 9:00 indicator at the median fore and aft reading and the 12:00 one 90 degrees later (with the spindle being rotated Clockwise as seen from the ?tailstock).? Note the indicator readings at both ends at four locations 90 degrees apart as you rotate the spindle.? This will roughly generate two circles.? If the two circles are the same diameter and the centers are at the same point, you have runout but no wobble and the spindle and bar holder combination is parallel to the rear of the front way.? And so forth through the other possible scenarios..

?

Robert Downs

?

From: [email protected] [mailto:[email protected]] On Behalf Of Robert Duvall
Sent: Sunday, February 3, 2019 14:44
To: [email protected]
Subject: [atlas-craftsman IO] How to align spindle to bed

?

hi guys have looked around at the files and can’t find out how to check alignment of the spindle to the bed. Aka to made sure the spindle is paralleling the bed ways. Thanks for the help this group is awesome. Bob