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| Quick Change Tool Post for Raglan 5inch Lathe |
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| Meldonmech:
Steve, thanks for you comments. Next came the locking cam, which aims to lock the tool holder in position, in an angular handle movement of 45 degrees. The basic turning was done in the four jaw chuck, then set over to machine the cam. Finally, the height had to be machined, to provide a close running fit in the tool post. The chuck was first changed to a 3jaw. A hard wood mandrel was turned with a slight taper to fit the bore of the cam, and a fixed steady used at the other end. Light cuts were taken to carefully machine the bottom to size. Cheers David |
| Meldonmech:
The tool holder patterns were made using timber. Because the patterns were so simple I tried open sand casting. The moulding was much easier, and the castings satisfactory. |
| Meldonmech:
The castings were machined to size on the milling machine using a fly cutter. They were then marked out for the next operations One of the machined blocks was set up in the mill to cut the dovetail. A slot was first cut using an end mill, then finished with an angle cutter. When angles had been formed two pieces of ground silver steel were inserted one either side to check measurements. The dovetails must be a tight sliding fit with the tool post. |
| Meldonmech:
The slot for the tool was milled, and the tool holding down screw holes, drilled and tapped. Note I made the front two holes close together to enable short tools to be held. A |
| Meldonmech:
After one holder was satisfactorily completed, a small batch were made. |
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