1. Design Strategies
Design for XXX

2. Design for X Design Strategies
Part shape strategies:
adhere to specific process design guidelines
if part symmetry is not possible, make parts very asymmetrical
design "paired" parts instead of right and left hand parts.
design parts with symmetry.
use chamfers and tapers to help parts engage.
provide registration and fixturing locations.
avoid overuse of tolerances.
10/10/2019

3. Design for X Design Strategies
Standardization strategy
use standard parts
standardize design features
minimize the number of part types
minimize number of total parts.
standardize on types and length of linear materials and code them.
consider pre-finished material (pre-painted, pre-plated, embossed, anodized).
combine parts and functions into a single part.
10/10/2019

4. Design for X Design Strategies
Assembly strategies 1
design product so that the subsequent parts can be added to a foundation part.
design foundation part so that it has features that allow it to be quickly and accurately positioned.
Design product so parts are assembled from above or from the minimum number of directions.
provide unobstructed access for parts and tools
make parts independently replaceable.
order assembly so the most reliable goes in first; the most likely to fail last.
10/10/2019

5. Design for X Design Strategies
Assembly strategies 2
make sure options can be added easily
ensure the product's life can be extended with future upgrades.
use sub-assemblies, especially if processes are different from the main assembly.
purchase sub-assemblies which are assembled and tested.
10/10/2019

6. Design for X Design Strategies
Fastening strategies 1
use the minimum number of total fasteners
use fewer large fasteners rather than many small fasteners
use the minimum number of types of fasteners
make sure screws should have the correct geometry so that auto-feed screwdrivers can be used.
design screw assembly for downward motion
minimize use of separate nuts (use threaded holes).
consider captive fasteners when applicable (including captive nuts if threaded holes are not available).
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7. Design for X Design Strategies
Fastening strategies 2
avoid separate washers and lockwashers (make it be captivated on the bolt or nut so it can still spin with respect to the fastener)
use self-tapping screws when applicable.
eliminate fasteners by combining parts.
minimize use of fasteners with snap-together features.
consider fasteners that push or snap on.
specify proper tolerances for press fits.
10/10/2019

8. Design for X Design Strategies
Assembly motion strategies
fastened parts are located before fastener is applied.
assembly motions are simple.
Assembly motions can be done with one hand or robot.
assembly motions should not require skill or judgment.
products should not need any mechanical or electrical adjustments unless required for customer use.
minimize electrical cables; plug electrical sub-assemblies directly together.
minimize the number of types of cable.
10/10/2019

9. Design for X Design Strategies
Automation handling strategies 1
design and select parts that can be oriented by automation
design parts to easily maintain orientation
use parts that will not tangle when handled in bulk.
use parts what will not shingle when fed end to end (avoid disks).
use parts that not adhere to each other or the track.
specify tolerances tight enough for automatic handling.
avoid flexible parts which are hard for automation to handle.
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10. Design for X Design Strategies
Automation handling strategies 2
make sure parts can be presented to automation.
make sure parts can be gripped by automation.
parts are within machine gripper span.
parts are within automation load capacity.
parting lines, spruces, gating or any flash do not interfere with gripping.
10/10/2019

11. Design for X Design Strategies
Quality and test strategies
product can be tested to ensure desired quality
sub-assemblies are structured to allow sub-assembly testing
testing can be performed by standard test instruments
test instruments have adequate access.
minimize the test effort spent on product testing consistent with quality goals.
tests should give adequate diagnostics to minimize repair time.
10/10/2019

12. Design for X Design Strategies
DF Maintenance strategies 1
provide ability for tests to diagnose problems
make sure the most likely repair tasks are easy to perform.
ensure repair tasks use the fewest tools.
use quick disconnect features
ensure that failure or wear prone parts are easy to replace with disposable replacements
provide inexpensive spare parts in the product.
ensure availability of spare parts.
10/10/2019

13. Design for X Design Strategies
Maintenance strategies 2
use modular design to allow replacement of modules.
ensure modules can be tested, diagnosed, and adjusted while in the product.
sensitive adjustment should be protested from accidental change.
the product should be protected from repair damage.
provide part removal aids for speed and damage prevention.
protect parts with fuses and overloads
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14. Design for X Design Strategies
Maintenance strategies 3
protect parts with fuses and overloads
ensure any sub-assembly can be accessed through one door or panel.
access over which are not removable should be self-supporting in the open position.
connections to sub-assemblies should be accessible and easy to disconnect.
make sure repair, service or maintenance tasks pose no safety hazards.
make sure sub-assembly orientation is obvious or clearly marked.
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15. Design for X Design Strategies
Maintenance strategies 4
make sure sub-assembly orientation is obvious or clearly marked.
provide means to locate sub-assembly before fastening.
design products for minimum maintenance.
design self-correction capabilities into products
design products with self-test capability.
design products with test ports
design in counters and timers to aid preventative maintenance.
specify key measurements for preventative maintenance programs
include warning devices to indicate failures.
10/10/2019