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

draft angles with cylindrical corner radius

draft angles with cylindrical corner radius

(OP)
If a drawing note specifies a profile feature to have a draft angle "all around", shouldn't any radius on the profile also have a draft angle, essentially making it conical rather than cylindrical?

RE: draft angles with cylindrical corner radius

That's the way I would read it.

If the radii are interpreted as portions of right circular cylinders, then they can't also be tangent to drafted surfaces, so you wind up with some awkward transitions.

Mike Halloran
Pembroke Pines, FL, USA

RE: draft angles with cylindrical corner radius

Depends on how it is specified on the drawing or in the model. It can be either way, and is up to the designer to specify. Corner or edge treatments in that situation should not be left unspecified.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: draft angles with cylindrical corner radius

(OP)
Thank you for your replies:
In this instance the customer has also provided a model.
The instruction for this job/ customer is "build to print" and a note on the drawing states "machined as shown".
- Pictorially, the radii appear to be cylindrical
- The model provided has cylindrical radii
- The note, draft angle "all around" contradicts the model provided
My intent is to machine cylindrical radii "as shown" and modeled since the note "all around" contradicts the model. Technically, it would be wrong either way I choose, since I will be disregarding the note "all around" on a drawing that takes precedence over the model.

RE: draft angles with cylindrical corner radius

You might want to rough out just the detail on a piece of scrap, and show it to the customer before cutting his actual part, so adjustments can be made at little expense to anyone.

Mike Halloran
Pembroke Pines, FL, USA

RE: draft angles with cylindrical corner radius

Less expensive and faster to model it, then show both models to customer.

Harold G. Morgan
CATIA, QA, CNC & CMM Programmer

RE: draft angles with cylindrical corner radius

The customer presumably already 'saw' a model, and didn't understand what (s)he was seeing.

Most customers understand physical models in their hands much better than they understand visualizations of models on a screen or on paper.

Mike Halloran
Pembroke Pines, FL, USA

RE: draft angles with cylindrical corner radius

(OP)
I think the problem is that we are dealing with buyers or middlemen instead of engineers. This part was a casting, I suspect is unavailable or too pricey for the quantity needed, and which probably does not need draft angles... but the response to that question was in the form of a "machining" model. At least I have the model to support my interpretation.

RE: draft angles with cylindrical corner radius

Yeah, why would anyone expect a "buyer" or "middleman" to know anything about how something is manufactured? upsidedown

"Just look for the lowest number on the screen..." is their mode of operation these days.

Proud Member of the Reality-Based Community..

To the Toolmaker, your nice little cartoon drawing of your glass looks cool, but your solid model sucks. Do you want me to fix it, or are you going to take all week to get it back to me so I can get some work done?

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