Older models utilize high-grade phosphor bronze adjustable bearings, while later post-war models transitioned to precision taper roller bearings. 2. The Bed and Gap

Because these machines have lower top speeds, they are perfectly suited for High-Speed Steel (HSS) cutting tools and traditional braze-on carbide tools. If you use modern indexable carbide insert tooling, ensure you select inserts with geometries designed to work effectively at lower surface speeds, or maximize the spindle speed on smaller diameter workpieces to achieve the correct surface feet per minute (SFM). Handling the Controls

If you remove the gap piece to face a large diameter disc, take light cuts when transitioning back over the joint line of the bed when reassembled, as any microscopic misalignment can affect accuracy. Thread Cutting (Screwcutting)

Although public archival records about a specific “Mitchell of Keighley” vary in detail, firms bearing similar names commonly provided:

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