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| If possible always bore or turn soft jaws at the same chuck pressure that you clamp the workpiece. One easy way to do this is with the TEC Trueborer. . . . . . Serrated jaws generally offer more positional flexibility than slot/tenon style jaws. However slot/tenon jaws usually have a fixed position and hence offer the likelihood of attaining good repeatability more frequently if removed from the base jaws. . . . . . Replacement Hard Reversible Jaws may not be as accurate as the original jaws supplied with the chuck, because the originals would have been ground on the chuck under clamping pressure. To attain the same concentricity the replacement jaws would need to be ground or hard turned under pressure on the chuck in situ. Generally replacement jaws are used to clamp un-machined surfaces and a slight run out is acceptable. . . . . . Hard jaws or soft jaws? Generally soft jaws are used for second operation work on a machined diameter or where teeth marks cannot be removed. Hard Jaws offer safer and more arduous machining with the teeth biting into the material (see the Adjustagrip ranges in the catalogue). . . . . . Save time and keep your T-nuts loosely attached with each set of jaws when off the chuck. It is very quick and easy to position this loose unit on the chuck when changing sets reducing costly set up time. . . . . . When the workpiece is gripped the jaw stroke should always be at mid-stroke especially when boring or turning soft jaws. Hard jaws can be used with more or less but a safety margin of a quarter of the stroke should always be maintained. . . . . . Always adhere to the manufacturer’s manual and grease chucks regularly as this has a big impact on clamping forces it will also affect repeatability, operator safety and longevity of chuck life. . . . . . If large or heavy jaws are used be sure you are within the guideline limits outlined in the chuck manufacturers and our own our technical information. Large Jaws and workpieces can severely affect a chuck’s performance and cause unbalanced and dangerous conditions. . . . . . If you have any other points you are uncertain about please call our sales office and we will be pleased to be of assistance. |
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| Field End, Thame Road, Long Crendon, Aylesbury, Bucks HP18 9EJ England T: +44 (0) 1844 208050 F: +44 (0) 1844 201699 E: sales@thameworkholding.com |
 © Copyright 2010 Thame Workholding |
