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!

*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.

Jobs

why do we leave Tags when we do CNC machinig

why do we leave Tags when we do CNC machinig

(OP)
Hi All

watching this Video, I noticed the guy is leaving tags on the profile , and he explained this is to avoid the part to be cut off completely during machining , why do we do that ? why should we not cut the part off completely ?

RE: why do we leave Tags when we do CNC machinig

Which video would that be?
Please provide a link.
Thanks.

Conjecturally, if the workpiece is not completely finished in one operation,
and for example needs to be set up in another machine for a subsequent operation,
it can make sense to leave some portion of the feature by which the part
was first located in a fixture, so that the subsequent operations'
fixtures use the same feature for location. When the part is
otherwise complete, said tags or whatever can be removed by
abrasive machining, or perhaps just snapped off, or even left
on the finished part if they don't interfere with any function.

Mike Halloran
Pembroke Pines, FL, USA

RE: why do we leave Tags when we do CNC machinig

(OP)
Thank you very much , I actually had put the video , if you clicked on the word "this " in the first words of the paragraph , where I wrote "this video", that was the link , but I got you , thank you

RE: why do we leave Tags when we do CNC machinig

You would also need the tags to hold the part straight during the machining operation . This looks like a routing operation where the part is being completely milled out. As the cutter gets to its final cut , the part will curl without restraint.
B.E.

You are judged not by what you know, but by what you can do.

RE: why do we leave Tags when we do CNC machinig

This was not always the practice. Instead the machining would have to stop to allow the machinist to move the hold-down clamps. After the majority of machining is done the tabs can be milled down to be very thin so they are easily removed, or hold-down clamps can be used to restrain the item to allow completely removed by machining as the final step.

Vacuum fixtures can also be used to avoid tabs.

RE: why do we leave Tags when we do CNC machinig

Pretty simple stuff, if its cut off completely then when the second to the last one is cut, the part will just flap around when the last one is cut off, with the possibility of ruining the part and the cutter.
If there is a way to clamp it for tab removal then yes you can fully machine it then. Also low melting point alloys can be used to hold the part as well.

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


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