It should be noted that the cutting rake and clearance of the tool remain constant for all height settings, as of course the tool is shifted bodily up or down, and does not change its angle with relation to the slides.

Fig.6 shows the lathe set for plain turning. It will be noticed how simple the tool setting is and how the provision for height adjustment simplifies this operation. Tools made of different sections of tool steel are accomodated to bring their cutting edges to the correct height and in setting tools for side cutting, facing or taper turning, the correct position may be obtained immediately, and the single clamp grips the holder tightly in a second.

Fig.7 shows another close view of the new toolholder, with the lathe arranged for boring. This shows another advantage of the toolholder, that is, the way in which the boring tool or bar may be used with as great facility as the ordinary turning tool. The wide range of positions available for tool setting will be noted, and again the valuable feature of height adjustment, which is so essential, is readily obtained. When the extra strength and ease of setting with this toolholder for such an operation is compared with that when using a toolholder of the tool post type, or one of the old clamp plate style, the value of the new toolholder will be appreciated. The manner in which the height of the tool is altered, while still keeping its horizontal position, is a feature peculiar to the new holder, and is not found in any other.

Fig.7. - Lathe set up for boring. Note ease of toolsetting.