Details 9-11, the Height Adjustment Mechanism
Detail 9, the Height Screw Nut is very straight forward, but I didn’t have any 3/16″ brass to start with so I’m turning down some 7/16″ stock which was itself oversize and wouldn’t fit my 7/16″ collet.
The Height Screw Bearing, Detail 10, started from the same piece of brass. First I turned back an inch to the ø5/16″ then followed with the ø3/16″ fitted to the Tool Holder Head. Before hacksawing this off to finish the top side, I drilled and reamed the 5/32″ hole for the Height Adjust Screw. You need a sharp reamer here or it will just stretch the thinwall tube out which will pop back when the reamer is removed.
With the upper portion finished, the part was flipped and a live center engaged in the pre-drilled center. The threaded section was turned to ø0.136″ in a stepwise fashion. Here, I’ve just started threading.
Not wanting to bow the spindly part, threading was accomplished at 0.001″ per pass and therefore took quite a while. However, I ended up with a perfect thread the whole length so it was worth it. Checked in the nut made earlier, there is no play but the screw still turns freely.
Disclaimer and License
All material, including the CAD drawings, relating to the construction of the Cut Knurling Tool presented on this site is free to use any way you see fit. However, no guarantees are made regarding the accuracy or correctness of the material presented here.
(CAD drawings are in SolidWorks 2013 Format)