Grinding a very small Radius

Set up basics

                                              To grind a precise radius you need to accurately position to the swing center. To do this we use a dynamic process instead of the pivot center Finder.
The old center post Pivot center finder mounts in the pivot hole and projects a center up to the wheel.
Use the tool your going to grind in the collet, to position the grind.
Also we have found that if you can see it the project becomes alot easier to set up.
Precise Set up tips
Upper center  angular plane contact must be established
Pivot center finder in 3/4 collet
This governs rad at  plane to pivot center
Set wheel at angle Bring into the 90 degree center
Zero the dial  DRO  wheel Y Axis is located
 
Remove Pivot center finder from collet place in pivot hole
located Edge of wheel to X center
Chuck up tool to be ground bring to X length lock front ring
Time the rotation with Tool Setter
 
Using the microscope bring the tool to the wheel and fine tune
.

 

Small Rads are becoming very easy.
The new lapped in dovetail  slides on the x and y Axis table assemblies , combined with a magnified view of the position  make diaing in the radius attachment a breeze.

The pivot center / wheel can be easily dynamically located and the tool set with a great degree of repeatability usung the gradated dials.

True and dress the wheel, Load and time the tool, with indexing collar locked in.
Set wheel at height and desired angle to be ground Rotate Tower CCW 2 Degrees.
Center the Upper Y, (tool in the collet) then move off the tool radius 1/2 inch =.250
Bring the wheel at angle to the tool touch off
Rotate the Radius spindle clockwise slowly backing off upper X is necessary (dont crash the wheel) 
When fully rotated 90 degrees feed in upper X keeping and eye on things
Your there !

The 4.3 inch Machine Mounted Microscope

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Grinding Small Radius

If you can see it, you can grind it.

This 4.3 Microscope kit  is a $340 addition, fits on any JXT works best with the digital readout.    Confirm which mounting bolt size 3/8 or 1/4
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