Working from an Engraver Spindle Sketch to Parts can be daunting. However, I very rarely work with more than a few sketches and key critical dimensions.
This is all about improving the spindle of the Genmitsu 3018-Pro.
My aim was to use an ER11 chuck on a straight 10mm spindle and employing the existing drive motor.
My intention is to fit a pulley to the top of the spindle and to clamp this axially to the spindle, hence locking the spindle between the two bearings.
I found it almost impossible to directly thread the end of the spindle. So I machined the spindle itself down to 7mm diameter and then heat shrunk a piece of brass over it. I then machined the brass true to the shaft and threaded it 10x1mm.
Also, you can see that the main body of the spindle is an aluminium tube with a recess machined top and bottom to allow a ball bearing to be fitted. The outer section of the main body at the top of the tube was also machined to locate the plate that would hold the motor.
For holes at this diameter I find the 4 jaw independent chuck comes into it’s own. Align the centre using the centre of the tailstock.
The spindle and the mounting plate. Here you can clearly see the step in the spindle body.
After completely machining the holes and outer shape in the 1/4 inch thick aluminium I heated it up and pressed it onto the spindle body.
I then had the main parts of the spindle looking like my simple sketch.
Finally I’ve assembled a video of the journey from the simple sketch to a working spindle in operation in the cnc.