Manufacturing process for a cross-roller bearing with plug

A production process for a cross-roller bearing with plug, comprising the steps of;

• keeping a plug blank at a predetermined position in a loading bore cut in any one race blank for the ringlike track for introduction of more than one rolling element of roller, rough cutting both the plug blank and the race blank at once and then subjecting them to a hardening treatment;
• moving the plug blank towards a biased position where an outside surface of the plug blank rises above an outside circular surface of the race blank, followed by working the outside surface of the plug blank together with the outside circular surface of the race blank at a time into finished surfaces lying in flush with one another;
• setting the plug blank back relatively to the race blank from the biased position to its initial position where the outside surface of the plug blank sinks below the outside circular surface of the race blank, followed by working an inside surface of the plug blank together with an inside surface of the race blank at a time, thereby finish cutting any one race combined together with the plug to have a circular raceway surface of V-shape in transverse section extending over both of them;
• combining other race of the ringlike track with the one race with no plug so as to fit the races into each other in a way the raceway surfaces on the races come into confronting one another, thereafter inserting more than one roller into a space between the confronting raceway surfaces through the loading bore;
• and then
• fitting the plug into the loading bore to secure fixedly the plug to the one race at the determined position.