Expansion bushings, if used, should be cleaned and cared for in the same manner as a normal mandrel. There are many specialized mandrels out there that are designed to fix specific problems. Following are some of these mandrels: A solid mandrel is a cylindrical, tapered bar whose one side is larger in diameter than the other. It is the simplest type of mandrel generally available in most machine shops. It is also known as the plain mandrel. These models utilise the same precision mandrels, expanding sleeves and locators as our CNC Expanding Mandrels.

Gang mandrel is similar to a step mandrel, except it allows multiple jobs to be machine simultaneously. Its ability to handle multiple workpieces simultaneously reduces the machining time and is thus used in mass manufacturing. Collar Mandrel A ring mandrel, or a triblet, is a cylindrical, tapered tool used in forging, shaping, and reshaping workpieces (mostly rings). Ring mandrels are mainly used in the jewelry industry. They can also be used for measurements if they have ring sizes on them. Other mandrels Expanding mandrel has a slightly complex construction. It has a mounted bush over a tapered arbor, which has a tapered hole with three longitudinal cuts. Two slots are cut nearly through, while the third cut is of full length. This construction allows the expansion of split bushing within a limit. A Gang mandrel has a fixed collar at one end and a movable collar threaded at the other end. This type of mandrel allows hollow workpieces to be placed between the fixed collar and the movable collar, followed by tightening it with a washer nut.

How to get in touch

PTG produce and supply precision expanding mandrels capable of automatic clamping in component bores, achieving the highest accuracy and holding power to resist the cutting forces imposed on the work piece.

Forging and reshaping: Ring mandrels (also called triblets) are used in the jewelry industry for forging and reshaping rings on them. The lathe dog should be secured to the end of the mandrel rather than on the smooth surface of the mandrel taper. The expanding mandrel can accommodate different diameters of workpieces ranging from 0.5m to 2mm. This range can be increased with a change in brush size. Ring mandrelsSeveral forces act on the workpiece to make it deflect away from the center, which makes the usage of mandrels necessary. The step mandrel isn’t plain like plain mandrel but has step collars of different diameters fitted with it. This allows it to be used for various diameters of workpieces. Step mandrel is used when the inner portion of the workpiece is in the form of steps, which makes step mandrel the right choice. Gang Mandrel The screwed mandrel has a fixed collar and an open threaded end to allow screwing threaded workpieces for machining purposes. This mandrel type is used when the inner part of the workpiece is threaded. Cone Mandrel

Side-actuated with an included square-drive key means that this unit can accommodate parts with blind bores as well as those with thru-holes. Mandrels make the workpiece rotate around the center only, increasing the jobs’ accuracy. Without proper support of the workpiece, there’s a chance for the job operation (e.g., drilling, boring etc.) to fail. A great option for low/medium-volume production. For high-production environments, use the standard KEM series

The collar mandrel is basically a lighter plain mandrel with two fixed collars attached at both ends. The fixed collars fit firmly on the workpiece. Generally, this mandrel is used for holding workpieces with diameters above 100 mm. Screwed Mandrel Expanding mandrels are especially useful when a workpiece requires secondary machining operations because these devices enable external diameters to be turned in a single operation, increasing concentricity between the two operations. They also prevent damage to previously machined surfaces, which is why expanding mandrels are often used on lathe sub spindles. The access they provide to a workpiece’s entire outer surface also makes them well-suited for use on lathes with live tooling. Collet style mounts in any machine or fixture that accepts 5C, 16C or 3J collets using existing spindle or adapter

Mandrels are typically slightly tapered to provide support during machining, so a solid frictional grip between the mandrel and the hole wall is in place when pressed into a previously machined hole. Mandrels used for holding make the workpiece rotate around the center only, increasing the job’s accuracy. Meanwhile, the ring mandrels are used to forge or reshape rings. There is a slot at both ends of the mandrel. The larger diameter end has a slot for the lathe dog, while the other has a protected center hole for the dead center. This mandrel type is used when the workpiece is plain and is available in different sizes from 44m to 450mm. Step MandrelThe line is standardised on most common gripping ranges and spindle types, and the company maintains a database of machine tool spindles and drawtubes to enable customization of drawtube connectors. Additionally, Kitagawa Europe offers a number of specialized systems to fit each company’s individual needs. Kitagawa Europe can supply systems with multiple expanding sleeves or mandrels that can support workpieces with IDs as large as 635mm. Although typically used in turning or grinding applications, our expanding mandrels can be adapted for use on milling machines with special fixtures as well. These models utilize the same precision mandrels, expanding sleeves and locators as our CNC Expanding Mandrels This article aimed to provide general information regarding mandrels. Mandrels are either used to hold a workpiece or reshape it. Specialized mandrels may be for specific purposes.