Transcription of Locating Principles & Devices
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Locating Principles & Devices
Locating Principles & Devices1 Locating PRINCIPLESTo position the work piece to tool, to ensure precision in machining Locating : dimensional and positional relation- ship b/w work piece and toolLocator: device to establish and maintain position of a part in a jig or fixture2 BASIC PRINCIPLESP ositioning the locatorAccuracy & tolerancesFool proofingDuplicate locationMotion economy31- Positioning the locatorsLocators should contact the work (preferably machines surface) on a solid and stable point:This permits accurate placement of the part in the tool &ensures the repeatability of the jig and fixture They should be placed as far as possible: This permits the use of fewer locators Ensures complete contact over the Locating surface2- Accuracy and ToleranceThe workpiece itself determines the overall size of a Locating element. locators must be made to suit the MMC (Maximum-Material Condition) of the area to be located. (The MMC of a feature is the size of the feature where is has the maximum amount of material).
LOCATING PRINCIPLES To position the work piece w.r.t. to tool, to ensure precision in machining Locating: dimensional and positional relation-ship b/w work piece and tool
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