Measurement

A page to bring together all of the measurement instruments and techniques that we use in model making and model engineering.

Dial Test Indicator – used to align and centre parts in the lathe among lots of other uses.

The dial gauge is an alternative and it gives a larger full-scale range of operation, typically around 1/2 inch or 12.5mm – using a dial gauge to machine a backplate and setup a new chuck.

Digital Calipers – the modern digital caliper allows you to measure: outside, inside and depth. The latest large face calipers are easy to use.

DRO’s – Digital ReadOut – digital readout system on a machine tool.

engineers square

Engineers Square – used to accurately mark a line at 90° to another. Fundamental tool used in marking out.

Micrometer – very accurate thickness and diameter measurement.

optical centre punch

Optical Centre Punches – allows you to line up the punch very accurately on the workpiece. Using a holder that you initially drop the optical centre into to align the holder, then you remove the optical centre and replace it with a hardened steel centre that is tapped with a hammer to mark the position.

Rulers – you need to be aware of parallax when using any manual measurement system and this includes a rule.

The Incra rule allows you to accurately mark through the ruler itself.

car boot find snug

Snug – the joints found on a magnetic base that is used to position a DTI or Dial Gauge.

vernier caliper

The vernier caliper provides the three basic functions of inner, outer and depth gauge. In all cases the measurement is read from the same vernier scale.