A little bit of the maching done, now parting off the large riser. I made the riser extra large because I'll be using it later for machining material.
The first side is finished and this is the second side. I'm measuring in from the outside diameter to where the PCD (pitch circle diameter) has to be marked. This measurement is obtained by subtracting the PCD from the outside diameter and then dividing by 2. If calculation is correct and the measurement done very carefully to the sharp point of the tool then very good accuracy can be obtained. The bore in the hub is press fit allowance for a pin to be pressed in.
The right hand side of the gadget is spigot located into the lathe pulley and the gadget is held on by 3 socket head cap screws in the same holes in the pulley that I put there when making my spindle turning handle. A 50 tooth gear, one that came with my lathe is sitting on the pin on the left end.
The "Rough and Ready" or "Bodgie Brothers" detent arm, maybe rough but it worked very well. I will be making a proper detent arm later on, I just did it this quick way so I could do the job I wanted to do.
Close up of the detent engaged in the tooth space of a 50 tooth gear. The small gear on the inside is just being used as a spacer.
The brass ring mounted on a mandrel in the lathe chuck. First part of this job done. 50 graduations with every 5th line a bit longer than the rest. This will be used on a 1mm pitch tool head down-feed screw on the Gingery shaper. Each graduation will represent 0.02mm so each 5th line will be 0.1mm. I also used the same set up to stamp the numerals on the graduated ring and to cut the finger grips, see my Gingery Shaper web pages, Page 35 and 36.
This should be a new window, minimise or close it to return to Home Page or press