|
What |
How
|
Why |
| QUANTITY |
Check annual requirements and advise supplier.
|
With an annual contact the supplier can minimize: tooling,
setup costs and material costs. Greater flexible for the
most economical method of manufacturing is allowed.
|
| OVER AND UNDER RUNS |
Ordering exact qualities increases costs.
|
Allowance must be made for overage in
production which must be prorated in the quoted price. |
| DELIVERY |
Allow sufficient lead time for normal Planning. Provide your
supplier with the best forecast .
|
Quick deliveries involve premium material and labor costs. A
longer / better forecast permits more economical
manufacturing runs.
|
| PACKAGING |
If special packaging, labeling or bar coding is required,
advise the supplier of this when the request for pricing is
made.
|
Unusual packaging requirements are expensive due to special
material and labor. if advised in advance , a supplier may
be able to provide alternative, less expansive packaging.
|
| MATERIAL |
Design and application permitting , Specify standard sizes
of Free machining grades.
|
Standard sizes cost less and are more readily available.
free machining material (Brass) yields greater production,
improved finish and closer tolerance.
|
| TOLERANCES |
Specify mo closer tolerance then absolutely functionally
necessary.
|
If required, suppliers of precision machined products can
and will make the parts with close tolerance. However,
higher costs can be excepted the closer the tolerance
requirements.
|
| INTERNAL DIAMETERS |
Hole diameters should be specified to the maximum allowable
limits.
|
Suppliers of precision machined products stock standard
drills and reamers. special internal diameters can be
produced but with expansive special tooling.
|
| THREADS |
Specify standard threads as far as possible like UNC , UNF,
OSO Metric, BSP (G) NPT, NPTF, BSW, BA etc. Also for
internal threads keep short lengths if possible.
|
Special Threads require special tools and gauges. Closer
fits may require additional operations.
Full threads are harder to tap.
|
| GAUGES AND GAUGING EQUIPMENT
|
Wherever possible part design should avoid the need for
special gauges.
|
Special gauges. and gauging equipment add to part cost.
Customers may supply special gauges to eliminate additional
Costs.
|
| FINISH |
Clearly specify surface finish no closer then necessary to
meet function requirements
|
Finer surface finish may require special tooling, slower
cycle time or additional second operations and special
handling and packaging methods.
|
| QUALITY |
Be as detailed as possible with the quality requirements.
Specify which characteristics are of greatest importance to
products performance.
|
This will allow the supplier to focus on what is important
and to follow parallel or compatible quality procedures.
|
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