Jig Boring Machine and CNC Turning: how the two fit together
Jig Boring Machine is a machine built to position holes accurately, with a thermally stable structure and precision scales. It is used for hole patterns where the position between holes matters more than the hole size. This entry explains what it is, what the numbers on a data sheet mean, and what to put on a drawing.
It is written from the point of view of the buyer and the drawing office: the values that are realistic in production, the ones that cost money, and the way the result is verified. Where an industry sets the requirement, aerospace is used as the example: traceability and a first article before anything enters the batch.
How the two fit together
Jig Boring Machine and CNC Turning are specified together more often than separately. Jig Boring Machine is a machine built to position holes accurately, with a thermally stable structure and precision scales, while CNC Turning is a cutting process where the workpiece rotates and a single point tool removes material; one produces the result and the other controls or finishes it.
Sequence
The order matters. Work is done with Jig Boring Machine, and then CNC Turning is applied to it; reversing the order is the usual cause of a part that measures correctly but does not work.
What to specify
| Specification | Typical value |
|---|---|
| Aspect | Note |
| This entry | Jig Boring Machine – ±0.005 mm |
| Related entry | CNC Turning – ±0.01 mm |
| Material | 6082-T6 aluminium |
| Finish | Ra 1.6 µm bored, Ra 0.4 µm with a fine boring head |
| Documentation | in-house approval with dimensional reports |
A combined note for the drawing
Where both apply, state the result and let the route follow: the tolerance, the finish and the verification. Dimension hole patterns from a single datum, not chain dimensioned
Applications
Jig Boring Machine is used for hole patterns where the position between holes matters more than the hole size, and in practice it appears most often in jig plates, mould plates, indexing fixtures, instrument bodies.
How it fits into a machining route
Jig Boring Machine is one station in a route rather than the whole of it. The part arrives with the previous operation finished and leaves with the features it is responsible for completed, so the datum and the clamping method are agreed before the first part rather than discovered on it.The route is fixed before the first part is cut, and it is the route rather than the individual setting that holds the result: pattern complexity and the number of size changes. Where a drawing calls for something the route cannot hold economically, that is raised at quotation rather than after the parts are made.
Standards, documentation and what is issued
The documentation requirement is in-house approval with dimensional reports. Material is supplied against a certificate where the application calls for it, inspection results are recorded with the job, and the records are kept so that a repeat order can be compared with the first instead of being measured from scratch.
CMM for the pattern, bore gauge for the sizes is the verification step. Where a customer format or a standard report is required, it is agreed before the batch starts, because a report written after the event is a report nobody can use.
Frequently asked questions
What tolerance should be specified for Jig Boring Machine?
±0.005 mm is realistic in production. Tightening it beyond the functional requirement increases cost without improving the part.
Which material is usually used?
6082-T6 aluminium is the usual choice, supplied against in-house approval with dimensional reports.
How is the result verified?
CMM for the pattern, bore gauge for the sizes, with the results recorded so a repeat order can be compared with the first.
What is the most common mistake?
Temperature drift during a long job.
How long does it take and what does it cost?
A realistic cycle is 1 to 4 hours for a plate, and the cost driver is pattern complexity and the number of size changes.
Related capability
If you are specifying Jig Boring Machine on a drawing and want a second opinion on the route, send the model and the quantity. The first response is a manufacturability review with the likely risk points and a quotation, so the decision can be made on facts rather than on a price alone.
Machining, inspection and documentation are handled in one place, which is why the dimensional report and the material certificate arrive with the parts rather than after them.
Related entries
These entries sit next to Jig Boring Machine in the encyclopedia: CNC Drilling Machine, CNC Milling Machine, Reaming and Boring. Reading them together gives a fuller picture of how the process, the material and the measurement affect each other.
