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Introduction Edit

This page explains how to make a template used for marking the location of the field-frame bar tenons to the field-frame rings. By using a template you save a lot of time and reduce the chance of errors. It is especially useful when making iron-framed ballistas where the field-frame bars are offset, as in the cheiroballistra.

The process step-by-step Edit

Mark the location of the field-frame bars onto a thin (~1 mm) steel plate. Here I've printed out the correct locations on a piece of paper and glued the paper to the plate:

Making a field-frame location marker template - 01

Drill two large holes through the to-be holes:

Making a field-frame location marker template - 02

Use small files to make the holes rectangular:

Making a field-frame location marker template - 03

Making a field-frame location marker template - 04

The template is now ready to be used.

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