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Terms in this set (20)
A screw is a type of fastener characterized by a helical ridge, known as a thread that rotates around a cylinder.
What are screws used for?
For our purposes, screws are used to join an object to another object, with the threads "biting" the other material.
What are the most common used screws?
Most commonly we use either Phillips head or hex head screws.
Do we prefer bolts or screws? Why?
Our robots tend to use bolts as opposed to screws, as screws are not meant for repeatedly removing and reinserting, as each time you do, a little material may be lost.
When do we use screws?
Most often, we use screws when working with wood, or when a component is installed on a robot with no reason to ever have to remove it later. Can you identify wood screws versus sheet metal screws?
Which types of bolts do we use?
Hex Head Bolts
Allen Head Bolts
Which 3 thread sizes do we use for bolts?
What is 1/4-20 thread size?
1/4-20: One quarter inch shaft diameter, 20 threads per inch
What is 10-32 thread size?
10-32: 0.1900 or 19/100 in diameter; 32 threads per inch
What is 10-24 thread size?
10-24: 0.1900 or 19/100 in diameter; 24 threads per inch
What does the first number represent(bolt thread)?
The first number represents the diameter of the bolt. It can be fractional in inches, or a number (6,8,10, etc.) As the number increases, so too does the diameter.
What does the second number represent(bolt thread)?
The second number represents the threads per inch, the greater the number, the more turns to sink the bolt an inch.
Why the different sizes for bolts?
It allows us to fit a specific bolt to a specific hole, and tighten at different rates.
Sometimes you want more torque per turn, sometimes less.
Sometime you want more precise control.
Many times, we are not concerned with this, and just want to have tools that fit the most bolts on our robot.
More precisely, we stock bolts that we know can do the job, so we are concerned, but we don't perform calculations on every bolt.
What are the most commonly used nuts?
Our most common nuts used are Nylocks and Hex bolts, used in combination with a simple flat washer.
What must the nut match? If you are fighting it, what may it be?
They must match the thread pitch of the bolt being used.
If you are fighting it, it may be stripped or the wrong size.
What are rivets?
Blind rivets, commonly referred to as "pop" rivets are tubular and are supplied with a mandrel through the center. The rivet assembly is inserted into a hole drilled through the parts to be joined and a specially designed tool is used to draw the mandrel into the rivet. This expands the blind end of the rivet and then the mandrel snaps off.
When are blind rivets used?
Due to this feature, blind rivets are used mainly when access to the joint is available from only one side. The rivet is placed in a drilled hole and is set by pulling the mandrel head into the rivet body, expanding the rivet body and causing it to flare against the reverse side. As the head of the mandrel reaches the face of the blind side material, the pulling force is resisted, and at a predetermined force, the mandrel snaps at its break point, also called blind setting. A tight joint formed by the rivet body remains, the head of the mandrel remains encapsulated at the blind side, although variations of this are available, and the mandrel stem is ejected.
What are rivets attached with?
Rivets are attached with a Rivet Gun, and vary in size based upon the diameter of the Rivet. Rivets can come in a variety of lengths as well as cap sizes and shaft diameters.
Difference between Nuts, Bolts, and Screws.
A nut is a small hexagonal object made out of metal. It is shaped in a hexagon so that it is easy and firm to grip from all sides. It has a hole in its centre, which has a thread running around it. A bolt is a long metallic piece that has a round stem as its body. The body is threaded in a helical (circular) manner. The metallic piece is topped with a head on one end that allows it to be turned, either into the object or the nut. A screw is an externally threaded fasterner being capable of being inserted into holes, in assembeled parts, of mating with a performed internal thread or forming its own thread and of being tightened and released by torquing the head.
What are washers used for?
are used to provide a wider point of contact between the head and the material. This can protect material, or allow more torque to be applied across a wider area.
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