select
navigate
switch tabs
Esc close

Is drawing needed for modeled threads?

0
P
2

Hello, I have a modeled anti-backlash lead screw shown in the image below:


My question is: when the thread is already modeled in the CAD file, is it still necessary to include a detailed drawing with the thread’s specification (e.g., pitch, diameter, class) for the manufacturing process? I’ll have my parts procured by an external provider.

Solved by Perry Grant
Hi Greg, Got it, thanks for the advice. I’ll include the thread specs in a drawing to ensure proper accuracy.
    • P

      Hello, I have a modeled anti-backlash lead screw shown in the image below:


      My question is: when the thread is already modeled in the CAD file, is it still necessary to include a detailed drawing with the thread’s specification (e.g., pitch, diameter, class) for the manufacturing process? I’ll have my parts procured by an external provider.

      0
    • Xometry Engineer

      If the thread is standard, we don’t recommend modeling it in the CAD provided and instead calling it out in a technical drawing. Threads have different sizes and classes, which relate directly to how the thread will be manufactured and inspected. Modeled threads may not fully incorporate the nuances of a manufacturing process; even if we have the right die or tap for the thread, it becomes a mess to chase if already formed.

      In your drawing I see no clearance between male and female thread features. That’s not the reality of good thread design, as clearance is always necessary, and features must have tolerances. Again, this is a good reason to call out the thread requirement on a drawing so there is something to inspect against.

      If this is a 3D print I would recommend modeling coarse threads, especially if they are custom, but also incorporate adequate surface offset to compensate for the selected process.

      0
      Reply
      • P
        Greg Paulsen

        Hi Greg,

        Got it, thanks for the advice. I’ll include the thread specs in a drawing to ensure proper accuracy.

        0
        Reply
Is drawing needed for modeled threads?
Your information:




Suggested Topics

Topic
Replies
Views
Activity
Airtight joint between two aluminum frame enclosures?
Hi, I have two 400 mm cubical enclosures from 20×20 mm aluminum profiles with glass on all sides except one. I need to connect them into a single temperature-controlled unit and keep the joint... read more
M
0
83
Nov 28
How to correctly specify standard and non-standard threads in a technical drawing?
For a machined part that has both standard and non-standard thread types, what’s the best way to call out threads in the technical drawing? In particular, should I use thread callouts or full detail... read more
I
R
6
565
Nov 14
Drawing callout for tight tolerance over short bore length
hi, I have an aluminum housing for a small gearbox where the bearing seats are, of course, critical. I need to hold tight tolerances on the ID and OD, but only over a short... read more
A
S
4
489
Oct 31
DMLS tolerances for screw holes and sealing surfaces
Hi, I’m working on a small metal housing (around 120 × 80 × 40 mm) that will be 3D printed with DMLS for a sensor module. It needs threaded M3 screw holes and a... read more
C
A
M
10
512
Nov 25
Design challenge: rope-to-rope transfer in a small cylindrical coupling
Hi, working now on a small-scale linear actuator project and need a compact coupling between two coaxial cylinders. Both are 44 mm in diameter, with the upper one hollow (22 mm inner Ø). The... read more
V
E
4
383
Oct 17