Page 157 - Subyek Computer Aided Design - [David Planchard] Engineering Design with SOLIDWORKS

Engineering Design with SOLIDWORKS® 201 8 Fundamentals of Part Modeling

Obtain knowledge about the manufacturing process

from your colleagues before you design the part.

Ask questions on material selection, part tolerances,

machinability and cost. A good engineer learns from

past mistakes of others.

Review the following design guidelines for Turned

Parts.
Examples of Cost Effective Materials

Guideline 1: Select the correct material. • AISI 303

• BRASS

Consider part functionality, operating environment, • AL 2011

cost, ''material and machine time," machinability and

surface finish. Utilize standard stock sizes and

material that is readily available. Materials are given a

machinability rating. Brass (100), AISI 303(65) and

AISI 304(30).

Example: Using AISI 304 vs. AISI 303.

AISI 303 is easier to machine due to its

higher sulfur content.

Guideline 2: Minimize tool changes.

Maximize feature manufacturability.

The Extruded Cut, Hole, Chamfer and

Fillet features require different tooling

operations. Will changes in form or

design reduce the number of operations

and the cost of machining?

Example:

• A void Fillets on inside holes to

remove sharp edges. Utilize the

Chamfer feature to remove sharp Fillet Edge Expensive Chamfer Edge Preferred

edges.

• Utilize common size holes for fewer

tool changes.

'

• Leave space between the end of an

external thread and the shoulder of

the rod. Rule of thumb: 1-2 pitch of thread, minimum. \

• Leave space at the end of an internal thread for the tool tip

endpoint.

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