Hi, we are Arnout and Martijn (3IPO)

In this instructable you'll be able to learn different metal connections & tips and tricks to work faster.

We will show you how to rebuild simple tools to achieve this goal and explain the settings of specific machines.


Metal Connections that will be discussed:

1) How to use Bolts, nuts and screws in prototypes.

2 ) Mechanical Connection Through Bending.

3) Practical tips to use Rivets.

4) Tips & tricks in Welding.

5) Tips & tricks in Spot welding.

Step 1: How to Use Nuts, Bolts & Screws in Prototypes

Some explanation

1) A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten two or more parts together. The two partners are kept together by a combination of their threads' friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together. ( Pic.4 )

1.1) A locknut is a nut that resists loosening under vibrations and torque. Elastic stop nuts and prevailing torque nuts are of the particular type where some portion of the nut deforms elastically to provide a locking action. ( Pic.4 )

1.2) Awasher is a thin plate with a hole that is normally used to distribute the load of a threaded fastener, such as a screw or nut. Washers usually have an outer diameter (OD) about twice larger than their inner diameter (ID). Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to Brinelling after the torque is applied. ( Pic.3 )

2) A screw is a type of fastener, sometimes similar to a bolt, typically made of metal, and characterized by a helical ridge, known as a male thread (external thread) or just thread. ( Pic.12 & 13 )


Making a nut and bolt connection:

  • mark the metal sheet ( use a scriber or a pen Pic.14 )
  • drill the holes ( Pic.2 )
  • Deburr the holes.
  • insert the bolts through the holes
  • screw the nut on the bolt ( Washers can be used to protect the metal or other materials )

Making a countersunk screw connection:

  • mark the metal sheet
  • drill the hole
  • use a countersink bit (or a bigger drillbit) to create a conical hole
  • use a screwdriver to drive the screw in


  • If you don't have a scriber or pen just take a small metal bar and create a sharp point using a big grinder machine.
  • Use a point of Impact to make sure you drill perfect. ( Pic.1 )
  • Don't always waste time to deburr the holes. Sometimes you can take a bigger drill and just deburr it by hand.
  • When attaching the nut/bolt you need 2 wrenches. If you don't have 2 wrenches you can use the vise to hold the nut or bolt in place ( Pic.5 & 6 )

About This Instructable




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