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How to Use a Height Gage for Layout
Guide · Updated October 27, 2026
A height gage with a carbide scriber is the most accurate way to lay out on a surface plate. This guide covers layout technique. To verify the gage itself, see checking a height gage with gage blocks.
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Step by step
- Prep: Clean the plate and the part, and coat the part with layout dye.
- Zero: Lower the scriber to the plate and zero it, or zero on the part's datum face.
- Set the height: Dial the height. For critical lines, set it on a gage block stack.
- Scribe: Pull the gage along with the scriber trailing slightly, using light pressure.
- Rotate for the other axis: Turn the part 90° on an angle plate or square to scribe the crossing lines, then punch the intersections.
Tips
- Keep the scriber sharp and set at a slight angle.
- Work every line from the same datum.
- Clamp the part to an angle plate for crossing lines.
Related: layout dye, surface gages.
Quick shop check
To scribe a line 1.250 in above a reference surface, zero the height gage on the plate, then raise to 1.250 in and lock. Drag the scriber across the dyed part once. Check the line with a scale or the height gage; reading within 0.001–0.002 in is normal for a vernier or dial height gage.
Worked example: scribing a line 1.000 in up
Clean the surface plate, the part, and the height gage base. Coat the part face with layout dye and let it dry. Zero the scriber on the surface plate, then raise it to 1.000 in and lock it. Hold the part against an angle plate, and draw the scriber across the face in one smooth pass with light, even pressure. Check the line with a scale or by reading it with the gage, and scribe again only if the first line is faint.
FAQ
How do I lay out with a height gage?
Zero on the plate or datum, set each height, scribe on dyed metal, then turn the part 90° for the crossing lines.
How accurate is height gage layout?
Lines can be within about ±0.001 to 0.002 in with a sharp carbide scriber and dye.
Can I set heights from gage blocks?
Yes. Touch the scriber on a stack for exact heights. Build any reference size free with the Gage Block Calculator at gageblockcalc.com.
Surface gage or height gage?
A height gage reads directly. A surface gage transfers a height you set.
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General shop information only — follow your gage manufacturer's instructions and your quality system.