The Overbeck Machine Twister Speed Lathe is a specialized tool designed for precise sanding, polishing, deburring, filing, scraping, gauging, and assembly operations. It is available in two models, the LT-1BR and LT-2AR, both engineered for efficient and safe material processing.

Function Description

The Twister Speed Lathe's primary function is to rotate a workpiece at controlled speeds, allowing for various finishing and shaping tasks. It utilizes 5C collets to securely hold workpieces, ensuring stability during operation. The machine is equipped with a spindle that can rotate in both forward (normal) and reverse directions, offering versatility for different applications. Speed adjustments are made via a dedicated knob, allowing operators to fine-tune the rotation speed to suit the material and task at hand. For quick stopping, the machine features a brake function, which can be activated either by a BRAKE-RUN switch or a foot switch. This dual control mechanism enhances operational flexibility and safety. The collet closer assembly, including a knurled knob and handle, facilitates easy and secure clamping and release of workpieces. A spindle lock plunger is also incorporated to prevent rotation when adjusting the collet or performing maintenance.

Usage Features

Operating the Twister Speed Lathe requires adherence to specific procedures to ensure safety and optimal performance. Before any operation, the main power switch must be in the OFF position. Workpieces are secured using 5C collets, which must conform to specific dimensions, particularly regarding the 1.2500-inch diameter and thread relief width, to prevent issues like collet rotation or spindle key entanglement. The collet tension is adjustable via a knurled knob and adjusting finger, allowing operators to achieve the desired gripping firmness for various workpiece diameters. It is crucial to ensure the collet and spindle bore are clean before insertion.

To start the spindle, the main power switch is turned ON, the SPINDLE ROTATION switch is set to NORMAL or REVERSE, and the BRAKE-RUN switch is moved to RUN. Alternatively, if using the foot switch, the BRAKE-RUN switch should remain in the BRAKE position, and the foot switch is pressed for rotation and released to stop. The spindle speed is then adjusted using the SPINDLE SPEED knob. For stopping, the BRAKE-RUN switch is moved to BRAKE. It is imperative that the collet closer is not opened or closed while the spindle is rotating, and the spindle lock plunger should not be pressed when the spindle is in motion.

The machine is designed for use with workpieces that do not protrude more than three inches from the spindle end. Polishing is generally performed at high speeds, while deburring and filing are done at lower speeds, especially for larger diameter parts. If chatter occurs, operators are advised to ensure their scraper is sharp and to reduce spindle speed. The machine's smooth and easy function is a hallmark, and any issues with collet fit or gripping should prompt a check for dirt or damage to the collet or draw tube threads.

Maintenance Features

Regular maintenance is essential for the longevity and safe operation of the Twister Speed Lathe. At the end of each day or shift, the machine should be wiped down to remove dust and debris, and the collet should be removed, and the spindle taper cleaned. Any functional or safety issues observed during this routine cleanup should be reported to the shift manager.

For installation, the LT-1BR model must be removed from its shipping base and placed on a clean, dry, and level surface, at least three inches from the edge of the mounting surface. It can be fastened using a 5/16-18 fastener screwed into a tapped hole on the bottom, ensuring the fastener is not overtightened to prevent drive belt slippage or motor damage. The LT-2AR model also requires placement on a clean, dry, and level surface, at least three inches from the edge. It has three 0.50-inch diameter holes for fastening. When bolting down the LT-2AR, especially to a workbench, rubber pads and bushings are recommended to prevent distortion of the lightweight aluminum alloy casting. Fasteners should be tightened just enough to slightly compress the rubber pads, ensuring no lateral movement. For flat machined surfaces, rubber pads are not needed, and 3/8-inch diameter fasteners should be torqued to a maximum of 10 Ft-Lb.

It is crucial to disconnect the machine from the power source before performing any service or maintenance. Modifications to the Twister Speed Lathe or the use of non-factory replacement parts will void the warranty and can lead to degraded or unsafe mechanical or electrical function, potentially causing injury or death. The machine is not designed for use with chucks or fixtures in the spindle.

OVERBECK MACHINE LT-1BR - Page 9