Overview Written for the experienced engineer as well as the student, this comprehensive reference presents the fundamental aspects of jig and fixture design in. This book explains both basic principles and advanced designs and applications for today’s flexible systems and controlled machines. Chapters include. Poulto Presto JIG and FIXTURE DESIGN MANUAL ERRATA (Henriksen: JIG AND FIXTURE DESIGN MANUAL) Page 66 – Substitute the.
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The larger tolerances are for the smaller dimensions. The process is manual and may not always be closely controlled.
Four areas of informa- tion must be taken into account; the part material and geometry, the operation required, the equipment for this operation, and the operator. However, some fixture components are now commercially available in stainless steel. As a substitute, an jig and fixture design handbook value may be used.
It is unalloyed low carbon steel car- bon content from 0. Jig and fixture design handbook sixth degree of freedom, rotation around a vertical axis, has not yet been removed. It is a very normal size fixture and can be accommo- dated on any milling machine except the very small ones.
Jig and Fixture Design Manual
jig and fixture design handbook Do not forget tool identification number, Make ends of pins pointed kig rounded for easy catch. This concept leads logically to the “universal fixture,” although “universal” may be an exaggeration. The physical prop- erties of the end product depend also on the mixing ratio, the curing time, and the curing temperature. When necessary, larger locators can be de- signed, but under no circumstances should the de- signer feel obligated to employ jig and fixture design handbook with ex- cessive bearing areas, chiefly because it is difficult to keep them free of chip fragments.
Better stilt, if possible, operate by hand without a wrench. If necessary, provide shielding. Thus, a jig is a type of fixture with means for positively hqndbook and supporting tools for drilling, boring, and related operations. Lo- cating points should be clearly visible, if jig and fixture design handbook. A light jig will be moved to correct position by the elasticity of the drill.
Representative average values for single-cavity hot molds, handboo, as jig and fixture design handbook di- mensional difference of mold and part at ambient temperature, are: They require less space and are commercially available.
It is obvious that all such dimensions must be correct, desihn course, handbool it is also necessary that any remaining unmachined surfaces maintain their proper location relative to system lines and to each other to avoid interference with each other and with moving parts of the- machine, to secure the required material thicknesses, and to provide uniform ma- chining allowances with full cleanup on all machined surfaces, A drastically exaggerated example of a violation of this rule is shown in Fig.
This is generally not the case, however, with or- dinary jigs and fixtures of special dsign. User Review – Flag as inappropriate Each design assignment will have a variety of solutions with different degrees of operational economy, a different useful life; and different costs.
Jig and fixture design handbook in the United States of America. As desigb general rule, there will be de- veloped at one time or another, a manufacturing operations plan, listing among other things, the se- quence of operations, calling for fixtures at the ap- propriate places within the plan and providing the machining parameters, cutting speed, depth of cut, feed, etc.
Common terms and phrases actuating adjustable alignment American Drill Bushing angle applied assembly axis bearing block bolt boring bars bracket burr buttons carbon steel cast iron chips chuck clamping device clamping force clearance contour counterbore Courtesy cutter guide cutting fluid cylinder diameter dimensions dowel pins drill jig edge ejector equal fixtue fixture base fixture body fixture designer flange flat friction gage gray iron grinding hand knob hardened hole hydraulic inch indexing fixtufe jaws jig body jig borer jig plate knurled lathe length lever liner loading locating pins locating surface locking device lugs machine tool machined surfaces material means milling cutter milling fixture milling machine mounted nesting operation pads plane plunger position press fit rotation screw thread shown in Fig side sliding slot spindle standard strap clamp stud T-slot tapered Thaulow thickness tion tolerances tool steel V-block vertical vise wear wedge welded workpiece.
Jig and fixture design handbook Machine Tool 3. This rule is quite general and can be applied to kig with combinations of jig and fixture design handbook outside surfaces and holes or slots.
Design Studies I Drill Jigs. Coolant supply and return 7. Loading and Unloading For the sake of clarity, the clearances shown in eesign illustrations are grossly exaggerated.
Stainless steel is also used for pur- poses where its lack of magnetic properties is of value, such as for separating elements in magnetic chucks and for backing bars in welding fixtures. In job shop production, these conditions are met by the layout of the parts prior to jig and fixture design handbook. December 19, Language: It may be light, medium, or heavy.
Offset and misalignments, as discussed above, are eliminated by the use of conical tapered locators, because they do not require clearance but provide positive contact. No eBook available Industrial Press Inc.
Full text of “Jig and Fixture Design Manual”
handbbook Drawings Dimensions and Tolerances. Motion takes place only during loading, and the maximum load on the locators during this period is only the weight of the part.
Steps in the Fixture Design Process In fixture design, the jig and fixture design handbook of the fixture is about the last step in the process. Preferably, the cutting force should be directed against the supporting points. If the part does not have a good locating base surface, but, for example, terminates in a point as shown in sketch cit is also subject to misalign- ment resulting in a maximum angular variation 6 of the axis direction determined by: The drill jig should be marked with drill size adjacent to bushings.
Such parts involve large tolerances on the jig and fixture design handbook contour, and for this reason, each marking is deslgn with multiple lines to make sure that the markings are not totally obscured. Index pins must move in and out easily, engage quickly and accurately, be locked against loosening when en- gaged, and unlocked and withdrawn preferably by one movement.
With dust, chip fragments, rust, and scale always involved in their use, the con- ditions on locator surfaces are far from ideal, and the type of wear to be expected is an intermediate between contact wear metallic contact between clean or corroded surfaces, no lubricant, no signifi- cant amount of foreign particles and jig and fixture design handbook wear.
The cutting and clamp- ing fixtuer should not act to distort the part or the jig and fixture design handbook. Mini- mum machining allowances are as follows: The most important of these are: It is an absolute necessity to have the sequence finalized prior to fix- ture design.
A similar situation exists for parts with two or more concentric cylindrical sur- faces.