Spindle Drawing: Shaft Proportions and Whorl Placement

Object Drawing Lessons

A hand spindle is a simple tool: a straight shaft with a whorl (a weighted disc) mounted at a specific point along its length. Drawing one convincingly depends on two measurable relationships: the shaft length compared to the whorl diameter, and where the whorl sits along the shaft. This lesson defines a clear drawing convention, walks through construction at two sizes, and gives you checkable arithmetic so your spindle looks balanced rather than guessed. All measurements are hypothetical examples; measure your own reference object if you have one.

Practice materials: Printable downloads are not available for this lesson yet. Use the instructions and four exercises below.

Defining the drawing convention

Use a single unit called one shaft-length (SL). Draw the shaft as a straight vertical line of length 1 SL. The whorl is a flattened disc centered on the shaft. Its diameter is a chosen fraction of SL, for example 0.25 SL, and its thickness is a smaller fraction, for example 0.06 SL. The whorl's center sits at a chosen height above the bottom tip, for example 0.30 SL. These numbers are hypothetical examples, not manufacturing standards.

Because letter styles and drawing habits vary, treat the convention as a set of ratios rather than fixed millimeters. Any drawing that preserves the ratios is valid. The rubric below rewards consistent proportion and clear placement, not a single universal shape.

1. Mark the bottom tip and top tip of the shaft; label the distance 1 SL.
2. Choose whorl diameter as a fraction of SL and write it down before drawing.
3. Choose whorl center height as a fraction of SL and mark that point on the shaft.
4. Draw the whorl as a symmetric disc centered on the marked point.
5. Check that the whorl's top and bottom edges are equidistant from its center line.

Constructing the shaft and whorl at one size

Start with a light vertical guide. Decide the shaft length in your chosen unit, for example 10 cm, and mark both ends. Divide the shaft into ten equal parts to make fractional placement easy. If the whorl center is at 0.30 SL, count three parts up from the bottom tip and mark that point.

For the whorl, decide its diameter as a fraction of SL. If diameter is 0.25 SL and SL is 10 cm, the whorl diameter is 2.5 cm, so its radius is 1.25 cm. Draw a horizontal line through the center mark, measure 1.25 cm each side, and sketch the disc. Keep the disc's thickness small and even, for example 0.6 cm, so it reads as a whorl rather than a ball.

1. Draw a vertical guide and mark 0 and 10 cm.
2. Divide into ten equal parts; mark 3 cm from the bottom for the whorl center.
3. Compute whorl radius: diameter fraction times SL divided by two.
4. Mark radius left and right of the shaft at the center height.
5. Draw the disc outline and erase construction marks.

Scaling to a second size

To draw the same spindle at a different size, keep every fraction unchanged and multiply by the new SL. For example, if the new SL is 16 cm, the whorl center is 0.30 times 16 = 4.8 cm from the bottom tip, and a 0.25 SL whorl diameter becomes 4 cm, giving a radius of 2 cm. The drawing should look like a scaled copy, not a redesigned object.

A common error is to keep the whorl at the same absolute size while changing the shaft length. That changes the proportion and makes the spindle look top-heavy or undersized. Always recompute both placement and diameter from the new SL.

1. Write the new SL value.
2. Multiply the whorl center fraction by the new SL.
3. Multiply the whorl diameter fraction by the new SL.
4. Divide the diameter by two to get the radius.
5. Compare the two drawings side by side to confirm matching proportions.

Checking placement and balance

A quick visual check: the whorl should sit at the same fractional height in both drawings. Measure from the bottom tip to the whorl center and divide by SL; the result should match your chosen fraction within a small drawing error. Also check that the shaft extends clearly above and below the whorl, since a whorl at the very tip is a different design choice.

Use simple arithmetic to verify: if SL is 12 cm and the whorl center fraction is 0.30, the center is 3.6 cm from the bottom. If the whorl diameter fraction is 0.25, the diameter is 3 cm and the radius is 1.5 cm. Any mismatch between computed and drawn values signals a proportion error to fix.

1. Measure drawn center height and divide by drawn SL.
2. Compare the result to the chosen fraction.
3. Measure drawn whorl diameter and divide by drawn SL.
4. Compare to the chosen diameter fraction.
5. Adjust the drawing until both ratios match.

Worked example

Draw a spindle with shaft length 20 cm, whorl center at 0.35 SL from the bottom tip, and whorl diameter 0.20 SL. Compute the center height, diameter, and radius, then describe the construction.

Four practice exercises

Common mistakes

• Keeping the whorl the same absolute size when the shaft length changes. Recompute whorl diameter as a fraction of the new shaft length so the proportion stays constant.
• Placing the whorl by eye without marking a fractional height. Divide the shaft into equal parts and mark the whorl center at the chosen fraction before drawing the disc.
• Drawing the whorl as a sphere or thick cylinder. Use a small, even thickness fraction so the whorl reads as a flattened disc.
• Letting the whorl overlap the shaft tip. Check that the whorl center height minus half its thickness is greater than zero, leaving shaft visible below.

Self-check rubric

• Shaft is drawn as a straight line with clearly marked top and bottom tips.
• Whorl center height divided by shaft length matches the stated placement fraction within a small drawing error.
• Whorl diameter divided by shaft length matches the stated diameter fraction within a small drawing error.
• Whorl is drawn as a flattened disc with even thickness, not a sphere.
• Shaft remains visible above and below the whorl.
• Two drawings at different sizes preserve the same fractions.
• Construction marks are light or erased, leaving a clean final drawing.
• Valid alternative styles are accepted if the ratios and placement are consistent.

Questions and answers