At Penn Tool Co we work hard to make sure that each time you purchase a tool, you are completely satisfied. To us, complete customer satisfaction means:. Penn Tool Co prides itself on keeping our price low without sacrificing quality.
Our customer service representatives are fully trained. Product knowledge and commitment to customer service guarantees that your order is processed the same day you place it. Even with customer service and price protection at the top of our complete customer satisfaction list, we know you want more. Our extensive inventory is yet another way to keep you satisfied. Our large selection of inventory lets us fill your order immediately and at a completion rate that is extremely high in our industry.
Look through our website. Search Advanced Search Search Tips. Spindle Nose Price CD 2. TH Series Click for larger view. Spindle Nose Price TH 1. HS Series Click for larger view. AS Series Click for larger view. Spindle Nose Price AS 2.
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You should upgrade or use an alternative browser. BTC Chucks? Thread starter Janderso Start date Mar 14, Joined Mar 26, Messages 6, It is a great chuck. I know nothing about BTC. Do you have one? Any good? Not cheap. Last edited: Mar 15, Joined Oct 18, Messages 2, BTC Chuck W. Industrial and BTC Chuck is a leading manufacturer of machine tool lathe chucks for over 50 years.
We are the largest manufacturer of chucks in the world. We have developed a reputation for high quality products at competitive prices. I'm sold, It has almost zero TIR when measuring the body and the jaws hold work with minimal run out. Just a bit of a tap here and a bit more there, perfect. Great lathe! H-M Lifetime Diamond Member.
Joined Nov 27, Messages 7, BTC chucks are made in China, well they have been for a while now. I've heard the early ones were made in the US but not sure of the truth in that. They seem to be fair quality chucks, at least the ones I've seen in person, but I do remember seeing complaints about some.
I always thought they were overpriced for what they are. Seems like they are even more over priced now. On mine, the label says, Los Angeles, California. I assumed it was manufactured there. There are no Chinesium attributes with my BTC. You may be right, the newer chucks may be made in Asia?
Doesn't matter if something has a city name, doesn't necessarily mean it's made there. China makes crap if you want them to make crap. China can very well make quality products if you pay for it. Joined Jun 12, Messages 3, Nice discussion on this question in , about 6 years ago I was looking to buy some chucks for my lathe and BTC was one that I checked out, similar to Feruda which became Gator, current chucks are made in China.
Gator chucks are hit or miss as to the quality, supposedly they are direct copies of the Bison, I use their back plates on my Bison chucks. Most likely your BTC is old production made in the US, but current production chucks get mixed reviews. The chuck suitable for holding round, or hexagonal, and other similar shaped workpieces.
In three-jaw chuck, the job is centered automatically and quickly. But it has the less gripping capacity as only three jaws are used and centering accuracy is soon lost due to wear. As the name implies, a combination of chuck, as shown in the figure. It is used both as a self-centering and an independent chuck to take advantage of both the types. The jaws are operated individually by separate screws or simultaneously by the scroll disc.
The frame has teeth cut on its underside which meshes with the scroll and all the jaws together with the screws move radially when the scroll is made to rotate by a pinion. The chuck is used for holding a very thin workpiece made of magnetic material which cannot be held in an ordinarily chuck.
It is also used where any distortion of the workpiece due to the pressure of the jaws is undesirable. The holding power of the chuck is obtained by the magnetic flux radiating either from the electromagnets or from the permanent magnets introduced within the chuck. In the ON position, the flux passes through the workpiece and grips it. Collet chucks are used for holding bar stock in production work where quick setting and accurate centring is needed.
The chuck attached to the spindle by a nut consists of a thin cylindrical bushing known as collet having a slots cut lengthwise on its periphery. The inside bore of the collet is cylindrical, hexagonal, square, etc. Depending on the shape of the work that will pass through it. The outside surface of the collet which is tapered fits in the taper hole on the body of the chuck, and the tail end which is threaded meshes with a key.
When the key is turned from outside, the collet is drawn in resulting in the split tapered end to be pushed inward due to the springy action. And the workpiece is securely and accurately held in the chuck. Different sizes of collectors are used for holding different sizes of the bar stock. These chucks are commonly used in capstan and turret lathes. This type of chuck shown in the figure.
It is used in mass production work for its fast and effective gripping capacity. The mechanism incorporates a hydraulic or air cylinder mounted at the back end of the headstock spindle and rotates with it. Fluid pressure is delivered to the cylinder by operating a valve with a lever and the piston will slide within the cylinder. The movement of the piston is transmitted to the jaws by a connecting rod and links and the jaws grip the workpiece securely.
A drill chuck is sometimes used in a lathe for holding straight shank drill, reamer, or tap for drilling , reaming , or tapping operation. The chuck is held either in headstock or tailstock spindle. It has centering jaws which have operated by rotating a key. So now, we hope that we have clear all your doubts about Chuck. We have also Facebook community for you guys, if you want, you can join our community, here is the link to our Facebook group.
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By having twice as many clamping points, a six-jaw chuck induces less than half as much clamping distortion in a thin-walled workpiece, compared to a three-jawed chuck. Two-jaw chucks are available and can be used with soft jaws typically an aluminium alloy that can be machined to conform to a particular workpiece. It is a short conceptual leap from these to faceplates holding custom fixtures, wherein the part is located against fixed stops and held there with toggle clamps or toe clamps.
Many chucks have removable jaws often the top part is removable leaving the base or 'master jaw' assembled with the scroll , which allows the user to replace them with new jaws, specialised jaws, or soft jaws. Soft jaws are made of soft materials such as soft unhardened metal, plastic, or wood. They can be machined as needed for particular setups. The typical interface between the master jaw and the removable jaw is a matching pair of serrated surfaces, which, once clamped by the mounting screws, cannot allow relative slipping between the two parts.
A collet, one type of chuck, is a sleeve with a normally cylindrical inner surface and a conical outer surface. The collet can be squeezed against a matching taper such that its inner surface contracts to a slightly smaller diameter, squeezing the tool or workpiece whose secure holding is desired. Most often this is achieved with a spring collet, made of spring steel , with one or more kerf cuts along its length to allow it to expand and contract.
An alternative collet design is one that has several tapered steel blocks essentially tapered gauge blocks held in circular position like the points of a star, or indeed the jaws of a jawed chuck by a flexible binding medium typically synthetic or natural rubber. The Jacobs Rubber-Flex brand is a name that most machinists would recognize for this type of collet chuck system. Regardless of the collet design, the operating principle is the same: squeeze the collet radially against the tool or workpiece to be held, resulting in high static friction.
Under correct conditions, it holds quite securely. Almost all collet chucks achieve the radial squeezing motion via moving one or more male-female pairs of tapered conical surfaces axially, which produces the radial squeezing in a highly concentric manner. Depending on the collet design, it can be either pulled via a threaded section at the rear of the collet or pushed via a threaded cap with a second taper into a matching conical socket to achieve the clamping action.
As the collet is forced into the tapered socket, the collet will contract, gripping the contents of the inner cylinder. The axial movement of cones is not mandatory, however; a split bushing squeezed radially with a linear force—e. Thus only in toolroom contexts, such as machine tool tooling creation and setup, is this common.
One of the corollaries of the conical action is that collets may draw the work axially a slight amount as they close. Collet chuck systems that make no provision to prevent this draw-in are often called draw-in collet chucks, in contrast to systems which circumvent this movement, usually by pushing the tapered closing ring toward the collet rather than pulling the collet into the ring.
Such non-draw-in types are often called "dead-length" or "non-draw-in" collet chucks. Draw-in is not always a problem, but avoiding it can be helpful on some work where failing to account for it might result in inaccuracy on part overall length, shoulder lengths, etc. Collets are most commonly found on milling machines , lathes , wood routers , precision grinders , and certain handheld power tools such as die grinders and rotary tools. There are many different systems, common examples being the ER , 5C , and R8 systems.
Collets can also be obtained to fit Morse or Brown and Sharpe taper sockets. Typically collets offer higher levels of precision and accuracy than self-centering chucks, and have a shorter setting up time than independent-jaw chucks. The penalty is that most collets can only accommodate a single size of workpiece. An exception is the ER collet which typically has a working range of 1 mm about 0.
Collets usually are made to hold cylindrical work, but are available to hold square, hexagonal or octagonal workpieces. While most collets are hardened, "emergency" collets are available that can be machined to special sizes or shapes by the user. These collets can be obtained in steel, brass, or nylon. Step collets are available that are machinable to allow holding of short workpieces that are larger than the capacity of normal collets.
The rotary force is supplied through wedges that fit into two or three open grooves. The hammer action actually moves the bit up and down within the chuck since the bit is free to move a short distance. Two sprung balls fit into closed grooves, allowing movement whilst retaining the bit.
SDS relies on a tool having the same shank diameter as the chuck; there are four standard sizes:. Many SDS drills have a "rotation off" setting, which allows the drill to be used for chiselling. The name SDS comes from the German steck, dreh, sitzt insert, twist, fits. Commercial production machining now makes use of increasingly advanced chucks which have not only indexable positioning but also indexable clamping.
The clamping is often done with each pair of jaws consisting of one fixed jaw and one movable jaw hydraulically actuated , thematically similar to advanced milling vises. This method of clamping brings the high precision and repeatability of such vises to a chucking application.
Such chucks offer the centering precision of traditional independent-jaw chucks with the chucking speed and ease of traditional three-jaw self-centering scroll chucks. They have expensive initial cost compared with traditional chucks , but such initial cost pays for itself and then lowers ongoing marginal costs in commercial production-run environments. It is also possible nowadays to build CNC chucks in which the position and clamping pressure of each jaw can be precisely controlled with CNC, via closed-loop positioning and load monitoring.
In essence, each jaw is one independent CNC axis, a machine slide with a leadscrew , and all four or six of them can act in concert with each other. Although this idea is conceptually interesting, the simpler chucking systems mentioned in the previous paragraph are probably a marketplace winner over this alternative for most applications, because they supply the same capabilities via a simpler, less expensive solution.
Used for holding ferromagnetic workpieces, a magnetic chuck consists of an accurately centred permanent magnet face. Electromagnets or permanent magnets are brought into contact with fixed ferrous plates, or pole pieces , contained within a housing.
These pole pieces are usually flush with the housing surface. The part workpiece to be held forms the closing of the magnetic loop or path, onto those fixed plates, providing a secure anchor for the workpiece. Commonly used for holding silicon wafers during lithography processes, an electrostatic chuck comprises a metal base-plate and a thin dielectric layer; the metal base-plate is maintained at a high-voltage relative to the wafer, and so an electrostatic force clamps the wafer to it.
Electrostatic chucks may have pins, or mesas, the height of which is included in the reported dielectric thickness; a design by Sandia National Laboratory uses a patterned silicon-dioxide dielectric to form the pins. A vacuum chuck is primarily used on non-ferrous materials, such as copper, bronze, aluminium, titanium, plastics, and stone.
In a vacuum chuck, air is pumped from a cavity behind the workpiece, and atmospheric pressure provides the holding force. Vacuum produces a hold down pressure of The decrease in holding pressure is roughly 0. Connecting chucks to the spindles or tables of machine tools or power tools has been accomplished in many ways over the years.
The original forms of workholding on lathes were between-centers holding and ad hoc fastenings to the headstock spindle. Faceplates have probably been around at least since the era of medieval clock-makers. Tooling similar to today's chucks seems likely to have evolved from faceplate work, as workers using faceplates for repetitive work began to envision types of clamps or dogs for the faceplate that could be opened and closed in more convenient ways than repeated total disassembly and reassembly.
A chock was originally just a lump of wood. However, by it could be "… Chocks, belonging to the Screw-Mandrel". Alexander Bell for a three jaw lathe chuck:. The instrument can be screwed into … the mandrel of a lathe, and has three studs projecting from its flat surface, forming an equi-lateral triangle, and are capable of being moved equably to, or from, its centre. It is not clear how they were moved "equably" whether by a scroll or some other means.
Hack for a four jaw chuck. Cushman — developed the ideas and sold chucks through his business, Cushman Industries. At the start of the 20th century, Arthur Irving Jacobs developed the modern drill chuck. After bruising his knuckles on one of the old-fashioned spanner adjusted drill chucks, he developed a chuck in which the jaws moved axially in inclined slots. His patent of details the mechanism. National and international standards are used to standardize the definitions, requirements, and test methods used for the performance evaluation of chucks.
Selection of the standard to be used is an agreement between the supplier and the user and has some significance in the design of the chuck. From Wikipedia, the free encyclopedia. Clamp used to hold an object with radial symmetry, especially a cylinder. Main article: Collet.
BTC 6 Jaws, 10" Diam, Self Centering Manual Lathe Chuck Plain Back Mount Spindle, Adjustable, Reversible, 1, Max RPM, " Through. BTC quality precision manual chucks including replacement parts and accessories. Available in 2 jaw, 3 jaw, 4 jaw and 6-jaw configurations. BBTC Chuck Choices. BTC® Chuck is a leading manufacturer of machine tool lathe chucks for over 50 years. We are the largest manufacturer of chucks in the world.