FILENAMES:

turret1.jpg
turret2.jpg
turret3.jpg
turret4.jpg
turret5.jpg
turret6.jpg
turret7.jpg

DESCRIPTION:

These are pictures of turret lathe usage to make a knob. 

Posted by Fred Veenschoten <fred-toni@mindspring.com>. 

The following description was provided:

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

Attached are JPG pictures of a Shaublin 102 turret lathe 
cutting a knob used in the guitar capo i make. 

see www.victorcapo.com 

The material is silicon bronse, the same as the castings 
for the capo. The stock dia. is 5/8" and is turned in 3 
passes down to .236" dia. "turret 1.JPG"

Next the knurl tool cuts the knurl. no picture for this 
but you can see the tool in other shots.

Next the thread is cut. this is an 11 1/2 TPI thread at 
.236" dia. In the pictures you can see a large bronze 
collar. This is threaded (11 1/2 TPI) on the I.D. and 
screws onto a sleeve, with a matching thread, that is 
mounted to the spindle.
 
The thread cutting tool "turret 2.JPG & turret 3.JPG" is 
attached to this collar via a quick engaging "T" bolt. 
The squarish opening in the tool holder bracket allows 
the fixed coolant nozzel to spray the thread cutter. 

when the spindle is turned by a hand crank "turret 4.JPG" 
the collar and cutter are both pulled to the left while 
the spinning cutter cuts the thread. The collar won't 
turn as it is attached to the turret tool and so moves 
to the left at the same pitch as the bronze collar I.D. 
thread thus cutting a 11 1/2 thread on the stock.

Next a groove is cut "turret 6.JPG". Locking tabs in the 
casting are bent into this groove to hold the knob into 
the capo.

Last the knob is parted off "turret 7.JPG". This is a 
"form tool" on it's right side to give a decorative end 
to the knob.

I can make about 36 of these per hour.

The threads on the knob engage teeth cast into the top 
of the lower arm of the capo. Turning the knob causes the 
lower arm to pivot on the pin. this provides the clamping 
action needed to pull the strings down to the fret of the 
guitar neck.

if anyone would like more info you can reach me from the 
web site listed above.

Thanks,
Fred Veenschoten

p.s. thanks to Ron Bryson for taking the pictures