Crumpler Kitchen

Crumpler has given away the pattern for one of their original messenger-style bags via an initiative called the Crumpler Kitchen. As a big fan of Crumpler, this seemed like a great opportunity for a project for our Year 5’s.

Beginning in term 3, this project will involve students:

  • Selecting an appropriate material.
  • Examining the pattern and scaling to size.
  • Sourcing approximately two meters of shoulder strap webbing, some Velcro, a clip or a buckle and something to adjust the strap length.
  • Learning to use a sewing machine.
  • Using 2D Design to design a Crumpler-esque badge for their bag. Similar to this one.
  • Sourcing some two-tone, light weight rubber for use on our Trotec laser cutter
  • Using the laser cutter to produce the badge for their bag
  • Hand-stitching the badge to their bag.

Students will show their creations to the Crumpler Team upon completion.

This is a real project that has process, product and audience and effectively uses technology to create something of value.

See our student handout – Crumpler Task

Want to make a DC Motor?

Today we utilized a 3D printed split-ring commutator with adhesive copper tape making contact with the brushes. We were expecting greater efficiency, but actually got less. The copper foil we are using isn’t ‘springy’ enough – a new brush system is needed or at least some thicker copper foil. (Granted it only has 2V through it in this video) Check it out.

Something else to consider when using 3D printed parts instead of balsa is that the extra weight causes the shaft to sag… If using 3D printed parts consider using something other than a wooden skewer – maybe a metallic skewer, knitting needle etc.

Find ‘Making a DC Motor’ Activity sheet available from download here, which also includes .skp files for the armature and commutator.!MchCjLJb!K0UQNSKNNGZ4tf9cDjL9JVJow-kiAZ8DVueE-06RPb4

We are currently working on a 4-pole DC motor. Two commutator’s will be needed placed 90 degrees out of phase to ensure maximum efficiency. (We think.)


4-pole armature

*Instructions for a simpler DC motor can be found here.