Hi,,,,I am making my 1st scarf joint. I am using 3/4 inch stock and want to resaw it to 5/8 inch to fit the depth of the tuners. When do I cut the thickness?,,,,before or after I make the angled cut for the scarf joint?
It depends on tools you have available as to best method. I run a full board of 3/4 through a desktop plainer to get my 5/8 and cut that into a bunch of head stock. However, you can go ahead and cut your scarf and take your down your head stock piece down by sanding or whatever means available to you. I find it much easier to reduce thickness when they are separate and it looks cleaner. Plenty of Youtube vids on scarf jigs.