18 Years manufacturer Tool Steel Manufacturer in Sudan
Tool steels contain tungsten, molybdenum, cobalt and vanadium in varying quantities to increase heat resistance anddurability, making them ideal for cutting and drilling equipment.
Our company since its inception, always regards product quality as enterprise life, continuously improve production technology, improve product quality and continuously strengthen enterprise total quality management, in strict accordance with the national standard ISO 9001:2000 for 18 Years manufacturer
Tool Steel Manufacturer in Sudan, we are now looking forward to even greater cooperation with overseas customers based on mutual benefits. If you are interested in any of our products, please feel free to contact us for more details.
Tool steels contain tungsten, molybdenum, cobalt
and vanadium in varying quantities to increase heat resistance and
durability, making them ideal for cutting and drilling equipment.
Making A Bump Style Knurling Tool Holder, by Clickspring
In this video I make a simple “bump” style knurling wheel holder, to hold the rope knurling wheels that I made in another video. It can be held in a standard mini-lathe tool post, and is a nice easy design requiring a bit of lathe and mill work, as well as a quick heat treat of the axle.
This is the second video in a series of at least 3, that will relate to the subject of creating these beautiful rope knurl patterns. Be sure to check out the other videos when you get a chance.
The main project video that this video is related to is “Machining A Set Of ‘Vintage Style’ Rope Knurls “: https://www.youtube.com/watch?v=i9pD5vIHJ8M
Free plans for the double angled cutter, and form tool:
If you would like to help support the creation of these videos, then head on over to the Clickspring Patreon page: https://www.patreon.com/clickspring
Ask Me A Question:
00:06 I’m in the process of making this set of rope knurls for some future Clickspring projects, and to use them I need a holder like this.
00:13 It’s a basic bump style knurling tool that can be mounted onto the lathe toolpost, and then pushed into the work to form the pattern. It’s a nice simple design; just a steel body section and a threaded axle.
00:25 The main body section doesn’t really need to be hardened, but I’d like it to last well, so I’m going to make it from O1 tool steel. The axle will definitely benefit from being hardened, so I’m making that from En8 carbon steel, so I can quench harden it later. So let’s get started.
00:44 I loaded the rod stock into the lathe, and turned the basic profile of the axle. A quick check of the axle diameter confirms that the knurl will be a close fit, and that it will also run freely.
01:34 This thread is quite short, and I’ve designed it to end flush with the outside of the tool body. I’d like to be able to get the knurling tool in as close as possible to the chuck when its in use, to minimise any flex in the part that’s being knurled.
01:58 After parting off, the axle was rechucked the other way, given a light facing cut and then taken over to the mill to form a screwdriver slot. At this point all of the main features of the axle are in place, it just needs to be quench hardened, and then tempered.
02:56 I’ve tempered it to a medium straw color, which means that it remains quite hard but its also quite tough too and so should last well. A quick touch with emery paper to pretty it up a little, and its done.
03:12 So now it’s on to the main tool body, and for the most part, these features are best formed on the mill, so the first step was to get it set up and located in the vise.
03:44 I drilled the work all the way through with the tapping drill size, and then half way through with a drill that was just a little than the clearance drill size. That way can follow that part of the hole with a reamer, and make sure that the axle will be a close fit in the tool body.
04:03 OK, so at this point I have the holes I want at each end, I just need to remove that waste stock in the middle.
04:10 To make that cut, I need the work standing upright in the mill vise, but of course if I just stood it up without any support it’d be way to flexible. So I’ve strapped it into the vise with some 1,2,3 blocks to give it some more rigidity.
04:23 Once confirmed vertical, I used some toolmaker clamps to further lock that top section in place. One side was tapped to accept the thread of the axle, and at this point most of the hard work has been done.
04:52 But I do think it would be better to round those corners, so I took care of that next. First with a quick marking out, followed by a few minutes on the belt sander. So here’s the end result.
05:33 The knurls have a little bit of end shake, and run nice and free on the axle. And best of all the holder has a clean edge on the side that will be closest to the chuck.
Frank Ford (Luthier/Machinist)
Making A Bump Style Knurling Tool Holder, by Clickspring
more at: http://scitech.quickfound.net
“Explains the nature of cold working operations, crystalline structure of aluminum alloys, slip planes and deformation, and microstructure changes.” Then explains heat treatment.
Public domain film from the US National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
Heat treating is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, normalizing and quenching. It is noteworthy that while the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding…
Metallic materials consist of a microstructure of small crystals called “grains” or crystallites. The nature of the grains (i.e. grain size and composition) is one of the most effective factors that can determine the overall mechanical behavior of the metal. Heat treatment provides an efficient way to manipulate the properties of the metal by controlling the rate of diffusion and the rate of cooling within the microstructure. Heat treating is often used to alter the mechanical properties of a metallic alloy, manipulating properties such as the hardness, strength, toughness, ductility, and elasticity.
There are two mechanisms that may change an alloy’s properties during heat treatment: the formation of martensite causes the crystals to deform intrinsically, and the diffusion mechanism causes changes in the homogeneity of the alloy.
The crystal structure consists of atoms that are grouped in a very specific arrangement, called a lattice. In most elements, this order will rearrange itself, depending on conditions like temperature and pressure. This rearrangement, called allotropy or polymorphism, may occur several times, at many different temperatures for a particular metal. In alloys, this rearrangement may cause an element that will not normally dissolve into the base metal to suddenly become soluble, while a reversal of the allotropy will make the elements either partially or completely insoluble.
When in the soluble state, the process of diffusion causes the atoms of the dissolved element to spread out, attempting to form a homogenous distribution within the crystals of the base metal. If the alloy is cooled to an insoluble state, the atoms of the dissolved constituents (solutes) may migrate out of the solution. This type of diffusion, called precipitation, leads to nucleation, where the migrating atoms group together at the grain-boundaries. This forms a microstructure generally consisting of two or more distinct phases. Steel that has been cooled slowly, for instance, forms a laminated structure composed of alternating layers of ferrite and cementite, becoming soft pearlite.
Unlike iron-based alloys, most heat treatable alloys do not experience a ferrite transformation. In these alloys, the nucleation at the grain-boundaries often reinforces the structure of the crystal matrix. These metals harden by precipitation. Typically a slow process, depending on temperature, this is often referred to as “age hardening”.
Many metals and non-metals exhibit a martensite transformation when cooled quickly(with external media like oil,polymer,water etc.). When a metal is cooled very quickly, the insoluble atoms may not be able to migrate out of the solution in time. This is called a “diffusionless transformation.” When the crystal matrix changes to its low temperature arrangement, the atoms of the solute become trapped within the lattice. The trapped atoms prevent the crystal matrix from completely changing into its low temperature allotrope, creating shearing stresses within the lattice. When some alloys are cooled quickly, such as steel, the martensite transformation hardens the metal, while in others, like aluminum, the alloy becomes softer…