fairchild buyer’s guide
TRANSCRIPT
Buyer’s guide
Following the principles contained within this guide, the engineers atFairchild Auto-Mated Parts, Inc. can help you by:
p Offering our talent and experience in bringing cost reduction andvalue analysis to your components and assemblies.
p Applying the most advanced tooling and latest machine technologies to bring your part “to life” and deliver it on time andat a very low cost.
p Employing “Just in Time” manufacturing methods to reduce oreliminate the need for large inventories of raw materials and finished goods.
p Assuring that you will receive the absolute best value for everydollar you spend on Fairchild-machined products.
For the design and purchase of Precision turned parts
800-927-2545 Fax 860-379-5340 www.fairchildparts.com
Fairchild Auto-Mated Parts, Inc. has prepared this guide to help our customers design, specify and purchase precision turned products.
Ultimately, it is hoped that the information contained within this guidewill help purchasing and engineering staff to understand
the many factors that can affect the costs, quality and successful function of the components used in their products.
Plating, Grinding, Heat Treating and other Outside ProcessesFairchild Auto-Mated Parts, Inc. has developed close working relationshipswith a number of select vendors who can partner with us in making your partcomplete, providing a wide variety ofsurface finishes, heat treatments, etc. When specifying plating, be sure to advise the thickness of plate desired andwhether the print tolerances apply afteror before the parts is plated. And tell us if specific test results are required during the incoming inspection process.When heat treating is required, try toavoid using general terms and, instead,give specific details as to hardness, casedepth, annealing times/temperatures,tensile strength, etc.
Services Offered by Fairchild Auto-Mated Parts, Inc.p CNC Turning & Millingp High-production screw machiningp 7-axis Swiss CNC Turningp Capacity: 2.5” Diameter bar;
6” chuck workp Special threads – all materialsp Short & Long Runsp Complex 6 & 7-axis machiningp Staking, stamping, bendingp Vibratory finishingp Assembly, packaging, stocking
programsp Product development consulting& testing
Questions?Please call us if there are any questions not answered by this guide or you have specific needs that may be unique to your product. We truly enjoy working withour customers and helping them get exactly what they need to make their productsthe best in the world!
800-927-2545 www.fairchildparts.com860-379-2725 Fax 860-379-5340
10 White Street, Winsted, CT 06098
AUTO-MATED PARTS, INC.fairchild
Check annual requirements andadvise supplier.
On re-orders, advise supplier of anychanges from the original prints.
Ordering exact quantities increasescosts.
Allow sufficient lead time for normal planning. Provide yoursupplier with the best forecast youhave.
If special packaging, labeling or barcoding is required, advise the sup-plier of this when the request forpricing is made.
Design and application permitting,specify standard sizes of free machining grades.
Specify no closer tolerance thanabsolutely functionally necessary.Be sure that the tolerances areshown on the drawing and arepractical and consistent with theapplication of the part.
For slotting, cross drilling, milling,broaching, etc., do not specify definite relationships between dimensions unless required.
Be sure all dimensions are shownclearly and add up.
With an annual contract the supplier can minimize: tooling,setup costs and material costs.Greater flexibility for the most economical method of manufacturing is allowed.
Allowance must be made for over-age in production which must beprorated in the quoted price.
Over/under run quantities in thePrecision Turned Parts Industry mayvary based on bar length, part sizeand equipment used to produce the parts.
Quick deliveries involve premiummaterial and labor costs. A longer/better forecast permits more economical manufacturing runs.
Unusual packaging requirementsare expensive due to special material and labor. If advised in advance, a supplier may be able toprovide alternative, less expensivepackaging.
Standard sizes cost less and aremore readily available. Free machining material yields greaterproduction, improved finish andcloser tolerances.
If required, suppliers of precisionturned parts can and will make the parts with close tolerances.However, higher costs can be expected the closer the tolerancerequirements.
Specifying a close relationship requires expensive fixturing andslows production.
Concentricity as a dimension should bespecified to the maximum allowablelimits.
Hole diameters should be specified tothe maximum allowable limits.
Unless there is a functional need for asharp corner, specify chamfers or radiiat all intersecting surfaces.
Specify standard threads, AmericanNational Standards Institute (ANSI)Unified Inch Screw Threads (UN andUNR Thread Form) or other ANSIstandard threads.
Use class 2a or 2b fits where application permits.
For I.D. threads choose the least percent of thread that gives the required strength.
Do not specify burr removal unlessnecessary to part function.
Clearly specify surface finish no closerthan necessary to meet functional requirements.
Be as detailed as possible with thequality requirements. Specify whichcharacteristics are of greatest importance to product performance.
Acquaint the supplier with any internal quality control requirements,so that production quality methods willbe consistent. Indicate initial samplerequirements, specialized data requirements and inspection routingsas part of the request for your quotation.
Wherever possible, part design shouldavoid the need for special gages.
Concentricity of dimensions often determines how a part will be produced. Holding closer limits thanrequired can cause considerable prob-lems in manufacturing and inspecting.
Suppliers of precision turned partsstock standard drills, reamers and pluggages. Special internal diameters canbe produced where required with special tooling.
Sharp corners nick easily and requiremore special handling. It is also moreeconomical to produce a part with“broken corners.”
Special threads require special toolsand gages.
Closer fits may require additional operations.
Full threads are harder to tap.
Burrs are a natural result of any machining operation involving intersecting surfaces. Burr preventionand removal may require additionalmachining or second operations.
Finer surface finish may require specialtooling, slower cycle time or additionalsecond operations and special handlingand packaging methods.
This will allow the supplier to focus onwhat is important and to follow parallelor compatible quality procedures.
Special gages and gaging equipmentadd to part cost. Customers may supplyspecial gages to eliminate additionalgage costs.
WHAT HOW WHY
HOW TO REDUCE COSTSAND PURCHASEMOREECONOMICALLY
PMPA offers a number of publications which suggest methods to more economically design and specify turned parts, including the “Designer’sGuide for Screw Machine Products” and “Engineering Design for Screw Machine Products.” These publications are referred to in the table below,with more details found on the back cover.
QUANTITY
OVER ANDUNDER RUNS
DELIVERY
PACKAGING
MATERIAL
TOLERANCES
DIMENSIONALRELATIONSHIP
WHAT HOW WHYCONCENTRICITY
INTERNAL DIAMETERS
SHARP CORNERS
THREADS
BURRS
FINISH
QUALITY
GAGES AND GAGINGEQUIPMENT
Check annual requirements andadvise supplier.
On re-orders, advise supplier of anychanges from the original prints.
Ordering exact quantities increasescosts.
Allow sufficient lead time for normal planning. Provide yoursupplier with the best forecast youhave.
If special packaging, labeling or barcoding is required, advise the sup-plier of this when the request forpricing is made.
Design and application permitting,specify standard sizes of free machining grades.
Specify no closer tolerance thanabsolutely functionally necessary.Be sure that the tolerances areshown on the drawing and arepractical and consistent with theapplication of the part.
For slotting, cross drilling, milling,broaching, etc., do not specify definite relationships between dimensions unless required.
Be sure all dimensions are shownclearly and add up.
With an annual contract the supplier can minimize: tooling,setup costs and material costs.Greater flexibility for the most economical method of manufacturing is allowed.
Allowance must be made for over-age in production which must beprorated in the quoted price.
Over/under run quantities in thePrecision Turned Parts Industry mayvary based on bar length, part sizeand equipment used to produce the parts.
Quick deliveries involve premiummaterial and labor costs. A longer/better forecast permits more economical manufacturing runs.
Unusual packaging requirementsare expensive due to special material and labor. If advised in advance, a supplier may be able toprovide alternative, less expensivepackaging.
Standard sizes cost less and aremore readily available. Free machining material yields greaterproduction, improved finish andcloser tolerances.
If required, suppliers of precisionturned parts can and will make the parts with close tolerances.However, higher costs can be expected the closer the tolerancerequirements.
Specifying a close relationship requires expensive fixturing andslows production.
Concentricity as a dimension should bespecified to the maximum allowablelimits.
Hole diameters should be specified tothe maximum allowable limits.
Unless there is a functional need for asharp corner, specify chamfers or radiiat all intersecting surfaces.
Specify standard threads, AmericanNational Standards Institute (ANSI)Unified Inch Screw Threads (UN andUNR Thread Form) or other ANSIstandard threads.
Use class 2a or 2b fits where application permits.
For I.D. threads choose the least percent of thread that gives the required strength.
Do not specify burr removal unlessnecessary to part function.
Clearly specify surface finish no closerthan necessary to meet functional requirements.
Be as detailed as possible with thequality requirements. Specify whichcharacteristics are of greatest importance to product performance.
Acquaint the supplier with any internal quality control requirements,so that production quality methods willbe consistent. Indicate initial samplerequirements, specialized data requirements and inspection routingsas part of the request for your quotation.
Wherever possible, part design shouldavoid the need for special gages.
Concentricity of dimensions often determines how a part will be produced. Holding closer limits thanrequired can cause considerable prob-lems in manufacturing and inspecting.
Suppliers of precision turned partsstock standard drills, reamers and pluggages. Special internal diameters canbe produced where required with special tooling.
Sharp corners nick easily and requiremore special handling. It is also moreeconomical to produce a part with“broken corners.”
Special threads require special toolsand gages.
Closer fits may require additional operations.
Full threads are harder to tap.
Burrs are a natural result of any machining operation involving intersecting surfaces. Burr preventionand removal may require additionalmachining or second operations.
Finer surface finish may require specialtooling, slower cycle time or additionalsecond operations and special handlingand packaging methods.
This will allow the supplier to focus onwhat is important and to follow parallelor compatible quality procedures.
Special gages and gaging equipmentadd to part cost. Customers may supplyspecial gages to eliminate additionalgage costs.
WHAT HOW WHY
HOW TO REDUCE COSTSAND PURCHASEMOREECONOMICALLY
PMPA offers a number of publications which suggest methods to more economically design and specify turned parts, including the “Designer’sGuide for Screw Machine Products” and “Engineering Design for Screw Machine Products.” These publications are referred to in the table below,with more details found on the back cover.
QUANTITY
OVER ANDUNDER RUNS
DELIVERY
PACKAGING
MATERIAL
TOLERANCES
DIMENSIONALRELATIONSHIP
WHAT HOW WHYCONCENTRICITY
INTERNAL DIAMETERS
SHARP CORNERS
THREADS
BURRS
FINISH
QUALITY
GAGES AND GAGINGEQUIPMENT
Buyer’s guide
Following the principles contained within this guide, the engineers atFairchild Auto-Mated Parts, Inc. can help you by:
p Offering our talent and experience in bringing cost reduction andvalue analysis to your components and assemblies.
p Applying the most advanced tooling and latest machine technologies to bring your part “to life” and deliver it on time andat a very low cost.
p Employing “Just in Time” manufacturing methods to reduce oreliminate the need for large inventories of raw materials and finished goods.
p Assuring that you will receive the absolute best value for everydollar you spend on Fairchild-machined products.
For the design and purchase of Precision turned parts
800-927-2545 Fax 860-379-5340 www.fairchildparts.com
Fairchild Auto-Mated Parts, Inc. has prepared this guide to help our customers design, specify and purchase precision turned products.
Ultimately, it is hoped that the information contained within this guidewill help purchasing and engineering staff to understand
the many factors that can affect the costs, quality and successful function of the components used in their products.
Plating, Grinding, Heat Treating and other Outside ProcessesFairchild Auto-Mated Parts, Inc. has developed close working relationshipswith a number of select vendors who can partner with us in making your partcomplete, providing a wide variety ofsurface finishes, heat treatments, etc. When specifying plating, be sure to advise the thickness of plate desired andwhether the print tolerances apply afteror before the parts is plated. And tell us if specific test results are required during the incoming inspection process.When heat treating is required, try toavoid using general terms and, instead,give specific details as to hardness, casedepth, annealing times/temperatures,tensile strength, etc.
Services Offered by Fairchild Auto-Mated Parts, Inc.p CNC Turning & Millingp High-production screw machiningp 7-axis Swiss CNC Turningp Capacity: 2.5” Diameter bar;
6” chuck workp Special threads – all materialsp Short & Long Runsp Complex 6 & 7-axis machiningp Staking, stamping, bendingp Vibratory finishingp Assembly, packaging, stocking
programsp Product development consulting& testing
Questions?Please call us if there are any questions not answered by this guide or you have specific needs that may be unique to your product. We truly enjoy working withour customers and helping them get exactly what they need to make their productsthe best in the world!
800-927-2545 www.fairchildparts.com860-379-2725 Fax 860-379-5340
10 White Street, Winsted, CT 06098
AUTO-MATED PARTS, INC.fairchild