=== Bolts [[Image(https://4.imimg.com/data4/RF/XQ/MY-26034901/iron-bolt-250x250.jpg,100px,left,margin-right=20)]] This is a bolt. They are the most common fasteners we use on robotics. The difference between a bolt and a [http://www.concretescrews.org/img/flat-head-self-tapping%20screw.jpg screw] is that a screw goes into a hole that already has internal threading (or the screw digs its own threads into a softer material) Whereas a bolt fastens things by sandwiching them with a nut. The bolt shown has a ''hex-head'', which means the head of the bolt is in the shape of a hexagon; heads come in many shapes and styles. Bolts are measured by diameter and [http://blog.chiltondiy.com/wp-content/uploads/2013/12/Coarse-and-Fine-Threads.png thread count.] Diameter is measured either in inches or millimeters, and thread is measured by threads per inch. The most common bolts we use on this team are 1/4 20 (one quarter inch diameter, twenty threads per inch). {{{ #!html
}}} There are many designs for the heads of screws and bolts. The oldest designs used a simple slot called a ''flat-head''; these are common, but it's easy for a driver to slip out of the slot and for the slot to get damaged. An improved design used a cross called a ''phillips-head'' which makes it much easier to keep a screwdriver in the head when tightening or loosening. Further improvements included hex, hex socket, torx, and [https://en.wikipedia.org/wiki/List_of_screw_drives many more]. See some examples below and their matching drivers. {{{ #!html }}} [[Image(http://www.homedepot.com/catalog/productImages/1000/9c/9c5e4fca-c5eb-4de5-a437-75bc182e0757_1000.jpg,100px,nolink,title="Flat Head")]] flat [[Image(https://images-na.ssl-images-amazon.com/images/I/41-PJ7nDSvL._SX342_.jpg,100px,nolink,title="Phillips Head")]] phillips [[Image(https://4.imimg.com/data4/RF/XQ/MY-26034901/iron-bolt-250x250.jpg,100px,nolink,title="Hex")]] hex [[Image(http://www.okmetal.com.tr/images/resim/7650_5758404102011165656.jpg,100px,nolink,title="Hex Socket")]] hex socket [[Image(https://www.belmetric.com/images/MSPX8X30%20Stainless%20Torx%20Pan%20Cheese%20Screw.jpg,100px,nolink,title="Torx")]] torx [[BR]] [[Image(http://c.shld.net/rpx/i/s/i/spin/image/spin_prod_1159448512?hei=1000&wid=1000&op_sharpen=1,200px,title="Flat, Phillips Drivers")]] Flat & Phillips Drivers [[Image(http://c.shld.net/rpx/i/s/i/spin/10042699/prod_17582145712?hei=1000&wid=1000&op_sharpen=1,200px,title="Nut Driver")]] !Hex/Nut Driver [[Image(http://www.roadcyclinguk.com/news/images/Lifeline-Allen-Keys-hi.jpg,200px,title="Hex or Allen Key")]] !Hex/Allen Key(for hex socket) {{{ #!html }}} {{{ #!html
}}} ---- === Nuts [[Image(https://images-na.ssl-images-amazon.com/images/I/21eW69Bl1KL.jpg,100px,left,margin-right=20)]] This is a nut. The purpose of a nut is to [https://d3pl14o4ufnhvd.cloudfront.net/v2/uploads/bb01a003-cdae-453c-8411-150bee474e9d/1807a9b6fd492db728307005cbbe3a46b674699e_original.png screw onto a bolt] to use as a fastener. However, regular nuts can sometimes loosen or fall off. On the team we often use lock nuts, which have [https://ae01.alicdn.com/kf/HTB11XV5KXXXXXafXVXXq6xXFXXXJ/500PCS-M3-font-b-Nylon-b-font-font-b-Lock-b-font-font-b-nut-b.jpg nylon on the inside] to grip the bolt and ensure it does not come undone. The other options are a different type of lock nut, which grabs material using little [http://products.coburnmyers.com/Asset/858.png teeth,] or [https://images-na.ssl-images-amazon.com/images/I/51tslS1SbWL._SY450_.jpg Locktite,] which is essentially glue you can drip on a nut/bolt combo to ensure it won't come undone. For a nut to fit on a bolt, it must have the same diameter and the same thread count. Therefore, only a 1/4 20 nut will fit on a 1/4 20 bolt. To tighten a nut onto bolt, a [https://www.harryepstein.com/media/catalog/product/cache/1/small_image/350x/9df78eab33525d08d6e5fb8d27136e95/4/1/41XH0OzJaFL.jpg nut driver] or a [https://content.artofmanliness.com/uploads/2013/03/adjustablewrench.jpg wrench] is generally used. {{{ #!html
}}} ---- === Screws [[Image(https://i.pinimg.com/originals/e1/d2/57/e1d2574c6972561bdb11f242d9f80760.png,left,margin-right=20,100px)]] This is a screw. As was mentioned before, the difference between a screw and a bolt is that a screw uses the threads to grasp onto a material instead of using a nut. The head of the screw will generally be one of four types. The type of head determines what sort of tool is used to tighten the screw. The most common type of head is [https://cdn3.volusion.com/vj539.howo6/v/vspfiles/photos/3330000-2.jpg?1495705819 phillips head,] which is inthe shape of a cross. To tighten this screw, a [https://cimg1.ibsrv.net/cimg/www.doityourself.com/660x300_100-1/9/Phillips-Screwdriver-134009.jpg phillips head screwdriver] must be used. The second most common type of screw is a [https://www.carid.com/images/dorman/hand-tools/44475.jpg flathead screw.] To tighten a flathead screw, a [http://drgirlfriend81.weebly.com/uploads/3/1/1/4/31149767/607392_orig.jpg flathead screwdriver] must be used. The other two semi-common types of screws are [http://www.anzor.com.au/exonet/image/Stainless%20Steel%20Csk%20Hd%20Socket%20Coachscrew%20316.png allen wrench screws,] which must be tightened by an [http://www.thecustomsabershop.com/GetImage.ashx?Path=~%2FAssets%2FProductImages%2Fallen2.jpg&maintainAspectRatio=true allen wrench,] and [http://brickstonegroup.us/photo/5227/deck-mate-9-x-2-12-in-star-flat-head-wood-deck-screw-5-lb.jpg torx head screws,] which must be tightened using a [https://sc01.alicdn.com/kf/HTB12FnUGFXXXXc8XpXXq6xXFXXXI/2437186/HTB12FnUGFXXXXc8XpXXq6xXFXXXI.jpg torx head screwdriver.] Screws are rarely used in metal, but we often use them in wood to construct prototypes or field pieces. {{{ #!html
}}} ---- === Rivets [[Image(http://img.directindustry.com/images_di/photo-g/16008-10697548.jpg,left,margin-right=20,100px)]] Another type of fastener is called a rivet. Rivets can be made out of metal and plastic, and they tend to be more temporary than bolts or screws. They are especially used in prototyping when constructing a basic cardboard prototype. A rivet has two pieces, and to fasten something together, one side is clicked into the other and locks in place. There are many different types of rivets, and they work in [https://www.hunker.com/13401179/how-do-rivets-work many different ways.] {{{ #!html
}}} ---- === Helicoils https://www.youtube.com/watch?time_continue=1035&v=T3I6RRHK9dE&feature=emb_logo ---- === Adhesives [[Image(https://dingo.care2.com/pictures/greenliving/1241/1240539.large.jpg,left,margin-right=20,100px)]] Adhesives are things that are used to attach things via stickiness. An obvious adhesive is duct tape (or any tape), and duct tape is commonly used to help prototyping and to fix small problems on the robot. Another type of adhesive is glue. On the team we will occasionally use [https://wonderopolis.org/wp-content/uploads/2016/04/dreamstime_xl_29624668_(Custom).jpg super glue] and [http://www.gorillatough.com/sites/default/files/Gorilla-Wood-Glue-4oz.png gorilla wood glue,] but we mostly use [https://simple.wikipedia.org/wiki/Epoxy 2-part epoxy] which is extremely strong once it has cured. Epoxy comes as two thick liquids that harden once they are mixed together and given time to cure (harden). {{{ #!html
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