Much like the adjustable live center, holding a tailstock chuck in perfect alignment without some method of adjusting it can be difficult or impossible. The adjustment screws and split design allow perfect centering for the chuck, should the quality of your work demand it. P/N 1202 has a 3/8-24 thread for 1/4″ and 3/8″ drill chucks, and P/N 1204 has a 0JT taper for a 5/32″ Jacobs drill chuck.*
(*Chucks not included)
Click on images for a larger view.
The accuracy attainable by adjustable tailstock tools is governed by the amount of skilled effort you put forth. Only someone new to the machine trade would talk about “perfect” alignment. In the machine business, you talk tolerances even if you can’t measure an error because now the error has to be assumed from the tolerances of your method of checking.
These holders are simple to use. The holders are divided into two parts with flanges. These flanges are bolted together with two screws. The clearance holes for these screws allow the front to be adjusted in relation to the rear. The rear section has a witness mark (groove). This mark should always be located at the top so the holder is situated the same way in the tailstock each time.