| 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 than 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. |
