Sherline Insert Boring Tools

Sherline now manufactures its own inserted tip carbide boring tool holders. They are available individually as an 80° holder (P/N 2259) or a 55° holder (P/N 2260). The pair of both holders is P/N 2261. Each comes with a carbide insert, hold-down screw and special Torx key. The 3/8" round shank is held in a P/N 7600 tool post. The 2260 holder accepts a 55° insert and requires a minimum hole size of 3/4". The 2259 holder accepts an 80° holder and fits into a minimum hole size of 1/2". In addition to fitting into a smaller hole, the 80° insert offers a little more strength, while the 55° insert will cut into a sharper corner. The holders are made from case hardened steel with a black oxide finish. A flat is ground on one side so the two hold-down screws of the 7600 tool post can tighten against it to keep the tool from rotating.

Overall length of the holder is 3-1/4", and with both hold-down screws engaged it can be extended to bore a hole a little over 2" deep. Because the further the tool is extended from the tool post, the greater the tool flex, the tool should be extended no more than is necessary to bore the hole you need. Longer boring tools are offered by other manufacturers, but due to tool flex, Sherline does not recommend extending them more than about 2" from the tool post, so their extra length is of little value. Tool flex in a boring operation can result in a poor finish, boring a tapered hole or, in the worst case, an insert to bite in and break.

Advantages using of carbide insert tools...

Though relatively expensive, if a cutting edge of a carbide insert becomes dull or chipped, the insert can be removed and rotated 180° to expose two new cutting surfaces, providing, in effect, two tools for the price of one.

The primary method of cutting metal on miniature machine tools is usually with high speed steel tools as they are inexpensive, easily resharpened and can be ground into "form" tools for special jobs. However, inserted tip carbide tools can be lifesavers for some jobs. Though more expensive and not able to be resharpened, carbide tools hold their cutting edge when cutting exotic metals like stainless steel or titanium or abrasive materials like carbon fiber and can speed up the cutting process. This is why they are used for most cutting tasks in the modern professional machine shop.

READ INSTRUCTIONS FOR USING CARBIDE INSERTED TIP TOOLS

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