Making a titanium clutch centre nut for an R1
I made a titanium clutch centre nut for an R1 this morning, and thought i’d do a pictorial history of its making. Its 30mm A/F.
First i parted off about 11mm of 35mm diameter bar, the finished size is 1o.5 but i like a bit to face off to get it all square and a good finish. So put the piece in the chuck and square it up, i use the tail stock face to press it up against which gets it just about true.
The thread is 20x1mm, i like to drill undersize and then bore to size, its much more accurate.
This nut has an undercut on the back face
Whenever you make a cut on titanium you raise a sharp feather edge, this has to be filed off.
On larger threads like this i like to screwcut the thread almost to depth and finish it with a tap. Although this is only a 1mm pitch thread and would tap reasonably easily i still like to screwcut first just to give me and the tap an easier time
The back of the job will now have a sharp egde round the thread exit hole, so
Now its time to mill the flats, i like to finish them a couple of thou or so oversize. All spanners are a sloppy fit so i like to take some slop out, i like thing to fit as well as they can!
Then its a smooth off with emery paper and a quick polish on the buffing wheel and…..