Cutting a Perfect Wood Ball using the EZ Ball Radius Cutting Jig
Created by Peter F. Hanover, Ontario, Canada
Step 1 - Set the correct height for the EZ Ball Radius Jig body.
a - Insert the jig's post into your lathe's banjo and insert a live center into your tailstock. (fig1)
b - Slide the tailstock up to the tool so that the point hits scribed line on the jig then lock the post in your banjo. (fig 2)
c - Lock the height ring for repeat accurate positioning. (fig3)
Step 2 - Align the EZ Ball Radius Jig cutting tip.
a - Slide the banjo so the jig's cutting tip meets your tail stock's live center's tip. (fig1)
b - Square up the banjo with the lathe's rail.
c - Using a carpenter's square make sure the banjo is square with the lathe rails and make a few marks with an ink marker. (fig 2)
Step 3 - Using the EZ Ball Radius Jig to cut a perfect ball from a square wood blank.
With the EZ Ball Radius jig setup and ready to cut lets proceed in making a cut.
a - Install a wood blank into a lathe chuck.
b - Measure the diameter of the blank and then mark a center line on the wood.
c - Start the lathe at 1000 RPM.
d - Using a spindle gouge remove some of the outside corners and form a cove so that the jig's cutting tip can easily move from left to right.. Be careful not to remove the centre line.
e - As you swing the jig slowly from left to right slowly turn the jig's knurled knob clockwise until cutting tip meets the wood.
f - Take small cuts until you have your desired shape.
g - Sand and finish.
h - Done
Note - The 20 degree HSS cutting bit of the EZ Ball Radius jig can be easily touched up on the side of a grinding wheel. The 20 degree angle on the tip is not critical. The precise angle required by the jig is automatically set when the bit is tighten in the jig.
As you can see it is easy to acheive excellent results
You can also adjust the cutter to produce other unique shapes, too!