Cam Độ Dài Mũi Khâu Kenmore Model 16 và 54

This part replaces both the steel hub and the nylon cam and integrates it into one unit. 

Print it so that the center hub is an easy slip fit on the mating shaft. Otherwise it will be hard to get it in place inside of the sewing machine.

You will need to drill and tap two holes for the set screws.  I used an 8-40 tap for the original set screws. Otherwise, a 8-32 is a much more common size found at hardware stores.  I used 8-32 x 3/16" long set screws.

I used PTEG at 100% infill. 

Instructions for replacement:

Remove the top and handwheel and go in from the end. 

Remove the reverse linkage by removing the screws on the right side of the main shaft.

 Remove the screw holding the linkages on the left side of the shaft. 

Disconnect the spring holding the two followers in contact with the cam.

 Move the two followers apart and out of the way of the cam. 

Loosen the setscrews on the cam bushing. Then the dial and reverser rod will pull out. Or tap on the cotter pin to drive it out if you encounter burrs that keep the cam bushing from sliding off.

When you reassemble, be sure the lower follower does not get trapped between the cam and the side of the machine. 

Also be sure to index the new cam properly. IIRC, the cam will be at the lowest part of the ramp with the dial set on the longest stitch.