8) Special Tools
A number of special tools are referred to in the main body of the design. These may be made by anyone with a lathe and drill.
Engraving tool.
Reamers
The two reamers below may be made from HSS toolbits or from Silver Steel that has been hardened, then tempered to a light straw colour. This type of reamer must be used at low speeds and feeds. Chips must be removed frequently.
There are other types of reamers, as shown below, but I've never got on with them. You wouldn't lose anything by trying this type first (on a bit of scrap material of course!).
The gear cutter below is needed for the sextant:-
Now the 6mm Reamer
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