Rat Exercise Wheel Cutaway: Frame, Axle, and Posture Drawing Guide

Object Drawing Lessons

This guide teaches a cutaway drawing of a rat exercise wheel focused on three essentials: the support frame, the axle connection, and the rat's posture inside the wheel. A cutaway removes part of the wheel surface so the axle and the rat can be seen together. Use a simple convention: draw the wheel as a side-on circle with a wedge removed from the near side, show the frame as straight supports meeting at a hub, and place the rat standing on the lower inside surface with its body angled along the running direction. X-height for any labels is baseline to midline; letter styles may vary. All numerical values below are hypothetical examples for practice, not equipment standards. Measure your own reference equipment if you draw from life.

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

Frame layout in cutaway view

Begin with the wheel circle and mark its center. The frame is the support structure that holds the axle. In a cutaway, show the frame behind or beside the wheel opening so it does not hide the rat. Draw two straight legs from a base line up to a hub block at the center. The legs can be vertical or angled; choose one and keep both legs symmetric about the vertical center line.

The hub block is a small rectangle at the center where the axle passes through. Draw the axle as a short horizontal line through the hub, extending slightly beyond it. Because this is a cutaway, the axle line should be visible inside the wheel opening. Keep the frame lines thinner than the wheel outline so the wheel reads as the main object.

1. Draw a circle for the wheel and mark its center with a small cross.
2. Draw a horizontal base line below the wheel.
3. Draw two straight legs from the base to a small hub rectangle at the center.
4. Draw the axle as a horizontal line through the hub, extending a little on each side.
5. Erase any frame line that crosses the wheel opening so the cutaway stays clear.

Axle and cutaway opening

The axle is the rod the wheel turns on. In this drawing, show it as a straight line through the hub, and show the wheel's near surface removed as a wedge. The wedge should open toward the viewer so the axle and the rat are both visible. A simple wedge is a triangle with its point at the center and its wide edge on the near rim.

Keep the axle line level with the center cross. If you add a nut or collar, draw it as a small rectangle on the axle beside the hub. Do not add hardware details you cannot see in your reference; a plain axle line is enough for this exercise.

1. Mark the center cross and draw the axle line through it.
2. Draw a wedge from the center to the near rim to show the cutaway.
3. Remove the near rim line inside the wedge so the opening is clear.
4. Add a small collar rectangle on the axle only if your reference shows one.
5. Check that the axle line stays horizontal and passes through the hub center.

Rat posture inside the wheel

Place the rat on the lower inside surface of the wheel. The body should angle along the running direction, with the head toward the front of the wheel and the tail trailing behind. Draw the back as a gentle curve, the head as a rounded wedge, and the feet as small contact shapes on the running surface. The rat's body should not cross the axle line; keep it below the axle in the lower half of the wheel.

Posture cues: the front feet reach slightly forward, the hind feet sit under the hips, and the tail curves along the wheel surface. These are conventions, not a single correct pose. A valid alternative may show the rat mid-stride with one foot lifted, as long as the body stays on the lower inside surface and the head faces the running direction.

1. Draw a curved back line in the lower half of the wheel.
2. Add a rounded head at the front end of the back line.
3. Draw front and hind feet as small shapes touching the lower inside surface.
4. Add a tail curve that follows the wheel surface behind the body.
5. Check that the body stays below the axle and does not overlap the frame legs.

Checking proportions and clarity

Use simple arithmetic to check placement. For example, if the wheel circle has a hypothetical radius of 6 units, the center is at 6 units above the base if the base is tangent to the circle. The axle line sits at the center height. The rat's back should sit roughly halfway between the center and the bottom of the wheel, around 3 units below the center in this example. These numbers are hypothetical; measure your own drawing.

Clarity check: the cutaway wedge should be obvious, the axle should be visible, and the rat should not be hidden by frame lines. Label the frame, axle, and rat with short words if needed. Keep label x-height between baseline and midline; letter style may vary.

1. Measure the wheel radius and mark the center height above the base.
2. Check that the axle line is at the center height.
3. Check that the rat's body sits in the lower half, below the axle.
4. Confirm the cutaway wedge is open and the axle is visible.
5. Confirm no frame line crosses the rat or the axle inside the opening.

Worked example

Draw a cutaway rat wheel with a two-leg frame, a horizontal axle, and a rat standing on the lower inside surface facing right. Use a hypothetical wheel radius of 5 units and a base line tangent to the bottom of the wheel.

Four practice exercises

Common mistakes

• Drawing the frame legs across the cutaway opening so they hide the axle. Move the frame legs behind the wheel or erase the parts that cross the opening; keep the axle visible.
• Placing the rat above the axle or outside the wheel surface. Keep the rat's body in the lower half of the wheel, with feet touching the lower inside surface.
• Making the axle line slanted or missing the hub center. Draw the axle horizontally through the center cross and the hub rectangle.
• Drawing the cutaway wedge too small to see the axle and rat. Widen the wedge from the center to the near rim until both axle and rat are clear.

Self-check rubric

• Frame: two or more straight supports meet at a hub; legs are symmetric about the vertical center line.
• Axle: horizontal line passes through the hub center and is visible inside the cutaway opening.
• Cutaway: a clear wedge removes part of the near wheel surface without hiding the axle or rat.
• Rat posture: body sits in the lower half, feet touch the lower inside surface, head faces the running direction, tail trails behind.
• Clarity: labels, if used, have x-height between baseline and midline; letter style may vary.
• Valid alternatives: either running direction is acceptable if posture cues are consistent; extra frame legs are acceptable if the opening stays clear.

Questions and answers