Reading Assignment
Optional Reading:
Outline
Jig Design
A jig is defined as a manufacturing aid that guides a tool.
The term “jig” applies to a device used to guide a cutting tools (usually a drill or reamer). The term “fixture” applies to a device used to hold a workpiece, such as a welding fixture.
This section covers the design of drill jigs and reamer jigs.
Machine Considerations
- Size and Rigidity
- Capability and Accuracy (what variation will come from the machine?)
- Accomodation of Workholding
- Location
- Compatibility with Tooling
- Use of Standard Cutting Tools
Advantages of Drill Jigs
- Minimize tool breakage
- Minimize human error
- Reduce cycle time
- Improved accuracy
General Design Guidelines
- Design to allow easy insertion and removal of the part
- Allow clearances for adequate coolant flow and chip removal
- Locate the workpiece properly (remember 3-2-1 principle)
- Hold the workpiece adequately (toggle clamps, etc) Consider effect on surface finish, flatness, rigidity of the part.
- Hold the jig in the machine adequately. Accomodate strap clamps, existing vise, t-slots, etc.
- Guide the tool properly
- See also Carr Lane Installation and technical data
Types of Drill Jigs
Open Jigs
Open jigs typically allow operations to be performed from a single direction. That is, they control placement of holes in two axes (X and Y) only.
There are a variety of open jigs:
- Plate or Template Jigs
- Circular Plate Template Jigs
- Nested Template Jigs
- Angle Plate Jigs
- Universal Jigs (Reglus.ch)
Closed (box-type) Jigs
Box-type jigs enclose the workpiece, and typically allow operations to be performed from multiple sides of the workpiece.
Drill Bushings
How to Select the Right Drill Bushing
Installation and Technical Data
Coolant Bushing
Chipbreaker Bushing
A jig is defined as a manufacturing aid that guides a tool.
The term “jig” applies to a device used to guide a cutting tools (usually a drill or reamer). The term “fixture” applies to a device used to hold a workpiece, such as a welding fixture.
Boring Jigs
See also: ACME Precision Bearings
