×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

2 Column Assembly Stack calculations - can anyone help?

2 Column Assembly Stack calculations - can anyone help?

2 Column Assembly Stack calculations - can anyone help?

(OP)
Hi All,

I have been working my way through 2 Column Assembly stacks and am a little puzzled over a problem.

Does anyone out there  have any experience in doing 2 Column Assembly Stack calculations?

Or alternatively know where I could find a forum or other material that would be helpful.

Thanks in advance

Best Regards

Dave

RE: 2 Column Assembly Stack calculations - can anyone help?

Dave,

I have never heard of "2 Column Assembly Stack"  is that a method similiar to Direct Linearization Method (DLM), and Monte Carlo simulation?

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
      o
  _`\(,_
(_)/ (_)

Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

RE: 2 Column Assembly Stack calculations - can anyone help?

I'm with Heckler, what do you mean by 2 column.

Do you just mean +-, ie finding the minimum and maximum values?

Ken

RE: 2 Column Assembly Stack calculations - can anyone help?

(OP)
Hi and thanks for the quick replies.

Sorry I should have been more specific, I am referring to to the Advanced Assembly Stack Calculations taught in a course by Alex Krulikowski.

BTW I have no idea about DLM and the Monte Carlo Simulation.

No offence intended but at first I thought you were pulling my leg until I did a quick search on the net and found both of them.  From the looks of both you mentioned they very heavily based in mathemetics although the 2 Column method is mathematics to the extent where you add up the min/max columns that's it to give a desired solution.  It is also ideal in the respect that you can then optimise you tolearance if you wish it to be looser or tighter.

Esentially in the 2 Column Stack method is summarised as follows:
1. You identify the problem (make a note of conditons affectiong the stack to be considered, label the start/end point and direction of your stack),
2. Choose a desired answer (IE identify what you are seeking, min/max dist or both),
3. Identify the stack path (ie where all the repsective components contact each other and and form the shortest path, label the path, write the details in the respective columns.
4. Do the math

Please bear in mind i have put in 4 very short points the essesnce of what the course teaches.  It is hard to convey a whole course in a few short lines but I hope this may give some of you a rough idea.

Regards for now, thanks in advance and hoping for some really interesting feedback.  I'd really hope to find someone else who has done the course as well.  Surely I can't be the only mortal who has done this specific course....pls :)

Best Regards

Dave

RE: 2 Column Assembly Stack calculations - can anyone help?

Here is his website:

http://www.etinews.com/services_onsite_statistical_stacks.html

Are you taking the online class?  You should be covering the two methods I listed above along with RSS and other stastical methods.

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
      o
  _`\(,_
(_)/ (_)

Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.

RE: 2 Column Assembly Stack calculations - can anyone help?

If I've understood what you're saying then yes I've done it quite a few times, wouldn't claim I was an expert though.  To me it's about the most basic tolerance analyis you can do, I didn't even realise there'd be a course on it, I just got told to get on and do it.

It gets more fun for something like a strap wrapped around something of which the diameter can vary but the basic process is fairly straight forward.  

Following the steps you've put should cover it.  The big thing is to make sure you have whether the dimension has a positive or negative effect, and hence whether you actually put the min or max value in that column.

When I find it more challenging is when as well as the hard dimensions you also have components that can float to some degree.  Now that gets fun.

Did you have a specific question?

RE: 2 Column Assembly Stack calculations - can anyone help?

Tolerance stack can be done fom 1D to 3D depending on your requirements, methods, and tools.
Software analysis programs that work with CAD data can be simple to use.

Tom Rhodes, GDTP-S
QMC LLC;  www.qmc.com
Senior Dimensional Management Engineer.
CeTOL 6 Sigma

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!


Resources