This is a gear repair for a high school Clausing metal lathe of the 

hydrostatic drive type.  This idler gear was missing 4 sections of

teeth and needed to be replaced in order to get the lathe running 

again.  The original cast iron gear had the bronze bushings removed,

waspressed on an arbor, then turned down about 3/4".  A steel ring

was then machined about .001 undersize on the bore (bot oversize on

the OD) and then pressed on the gear.

The ring and gear were then center drilled in three places at the 

joint line, tapdrilled, and tapped for 1/4 x 28tpi x 3/8 set screws.

Screws were then installed and the green "wicking" type Locktite was

applied.  the screws keep the ring from rotating or sliding side to

side during machining and then final use.  The gear "blank" was then

turned to proper OD, and the sides made parallel with the original

cast iron gear.  The gear and arbor where then transfered to a small

horizontal mill with a dividing head and the 72 teeth were cut.

It worked well on the lathe and the HS kids now have another lathe to

use.  Mike Fendley, LeClaire, Iowa    mikejanf@juno.com