Recent Blogs
Fiddle Drill: Bow Travel and Alternating Rotation Calculator | FIRGELLI
Calculate turns per one-way bow stroke and average rotational travel from contact diameter, bow travel and stroke rate. Includes an alternating-motion animation.
Spiral Push Drill: Lead and Stroke Geometry
How a Persian drill converts push force into reciprocating rotation through a quick-thread spindle. Used in jewellery, watchmaking, and dental tool design.
Parallel Plyers: Exact Parallelogram Jaw Geometry
Explore ideal parallel-jaw geometry using an equal-link parallelogram. Calculate horizontal offset, jaw separation, parallelism and the long diagonal.