Jet 719600, Operating Instructions And Parts Manual

9

The bed extension can be mounted to the upper or 
lower holes of the lathe at tailstock end, and lower 
holes at headstock end. Mounting in upper holes 
increases spindle length capacity of lathe. 
Mounting extension to lower holes allows use of 
tool support during outboard turning. 

1.  Slide tailstock away from edge of bed. 

2.  Have an assistant hold bed extension flush to 

end of lathe bed, and insert screws and 
washers provided with bed extension (P, 
Figure 5-6). Snug screws just enough to hold 
bed extension to lathe bed. 

3.  Unscrew stud from lathe bed (O

1

), and insert it 

into hole at end of bed extension (O

2

). 

4.  Adjust bed extension to lathe bed, aligning the 

surface and the inside ways as closely as 
possible.  

IMPORTANT:

 Top surface of bed extension 

must

 be flush with surface of lathe bed, and 

inside ways must be aligned, to allow smooth 
movement of tailstock across joint. 

5.  Slide tailstock over joint where beds meet, so 

that clamping nut is centered over joint, as 
shown in Figure 5-6. Lock tailstock clamping 
handle; this will align the beds. 

6.  Securely tighten screws (P) in bed extension. 

7.  Unlock tailstock and slide it back and forth to 

test smoothness of joint. Make further 
adjustments if needed. 

Figure 5-6:  installing bed extension (optional) 

5.8

  Spindle comparator (optional 

accessory) 

6mm hex key required. 

The spindle comparator bracket and centers are 
optional and purchased separately. See our 
website for information.   

The spindle comparator consists of two centers 
inserted into the brackets at rear of lathe. The 
comparator is used to mount a finished, or 
“reference” spindle, from which measurements can 
be taken, the measurements being transferred to 
the new piece being turned.  

1. Install comparator 

spur center

 into guard 

bracket, by lifting up on plunger and inserting 
comparator spur center until its point is about 
even with the point of the spur center in the 
headstock spindle. See Figure 5-7. The 
plunger in the bracket should engage one of 
the holes in the comparator center at this 
position. 

2.  Install comparator bracket to tailstock with 

provided fasteners (Figure 5-7). Hand tighten 
only. 

3. Install comparator dead center in the 

comparator bracket and tighten lock handle. 

4. Slide tailstock toward headstock until 

comparator centers almost touch. Adjust 
comparator bracket as needed until centers 
align. Tighten screws firmly. 

5.  Mount spur center with the spindle blank that 

you will be turning. Loosen tailstock locking 
handle, and slide tailstock until live center is 
about 1-inch from spindle blank, then tighten 
locking handle. Advance live center using 
tailstock handwheel, until live center is secured 
in spindle blank. 

6.  Mount reference spindle between comparator 

centers. 

NOTE: Reference spindle should be mounted 
last after all adjustment of tailstock and quill 
has been accomplished with spindle blank. 
Likewise, when turning operation is complete, 
remove reference spindle first. 

Figure 5-7:  installing comparator (optional)