×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

CNC Production Cycle Time Decession

CNC Production Cycle Time Decession

CNC Production Cycle Time Decession

(OP)
My company CNC manufactures about 30 different             2-dimensional 'widgets' in lot sizes of about 1000 parts.  We have about 20 different products and the jobs typically take 3-12 days to complete depending on the cycle time and setup.  As new products come about, I am constantly faced with the decision to design tooling to machine multiple parts at one time(long cycle), or to machine single parts (short cycle).  Pros and Cons are somewhat obvious: long cycle--(Pros) more parts are milled per tool change, operator is free to work on other tasks, less waste (Cons)more parts at risk, longer setup, more expensive tooling, longer tool design and build time, more parts at risk if a tool breaks or wears...  
Does anyone have some advice or know of some good research articles or case studies that address this issue?  Thanks

RE: CNC Production Cycle Time Decession

Designer99,
For a problem like this I use economic order quantity techniques and simply use time instead of money.  
Basicly, you add up the cost of each step for each option and the lower cost gets the nod.  This implies that you have some idea of the likelihood of the tool crashing and assumes that the labor rate for all steps is equal.  If it is not equal you will need to apply costs to the steps.
Not sure of web sources but a basic text on engineering economics will address you issue.

Griffy

RE: CNC Production Cycle Time Decession

In addition to the standard quantitative methods, you may also consider using simulation to give you insight from the timing/resources/scheduling point of view.  I haven't used it, but I saw a reasonably priced simulator called SIMUL8 for ~US$1500.  My guess is that it would be found on www.simul8.com ?

TygerDawg

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close