How high should the tool rest be?

For spindle turning, the tool rest should be at or just below the lathe centre height. For external bowl work, at centre height. For internal bowl work, at rim height. The tool handle should be roughly level or slightly below the cutting tip when the bevel is riding.

How close should the tool rest be to the workpiece?

As close as safely possible, typically 10-20mm from the workpiece surface. A closer rest gives more control and leverage. Always spin the workpiece by hand before starting the lathe to check clearance. Re-adjust the rest as you remove material.

When should I re-position the tool rest?

Re-position the rest whenever it is more than about 20-25mm from the workpiece, or when you change from external to internal cutting. Always stop the lathe before adjusting. Check clearance by rotating the workpiece by hand after each adjustment.

Does tool rest height change the cutting angle?

Yes. A higher rest angles the tool tip more steeply into the work, which can cause catches. A lower rest creates a more scraping action. The ideal height puts the bevel of the tool tangent to the workpiece surface at the cutting point.

WoodCalcs

Turning Tool Rest Calculator — Optimal Position

Determine optimal tool rest height and distance from the workpiece.

Turning Type

Workpiece Diameter

Lathe Centre Height

Centre to bed surface

How We Calculate This

This calculator recommends tool rest position based on the type of turning and workpiece size.

Guidelines

Spindle turning: Rest at lathe centre height, 15mm from work

External bowl: Rest at centre height, 15mm from work

Internal bowl: Rest at rim height, 10mm from rim

Roughing: Slightly below centre, 20mm from work (safety margin for out-of-round blanks)

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.