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
Flatness GD&T for 6061 plates
For a mounting plate for a precision sensor (about 200 mm × 200 mm) I was going to call out a flatness of 0.05 mm, but my senior engineer says that’s overkill and will double the machining... read more
K
E
U
2
39
Mar 10
ISO 2768-mK vs specific tolerances
Hey guys, I’m getting some pushback from our shop lead. I’ve been dimensioning every single feature on a new manifold block because I’m paranoid about fitment, but he says the drawing is "unreadable" and... read more
l
P
1
67
Mar 02
Thermal expansion modelling for a braced rectangular steel tank
hi, for a welded steel coolant reservoir for a test stand - 4 m × 2 m × 1.5 m with internal bracing I need to account for thermal expansion. Fluid runs at 80–90... read more
B
Q
L
2
352
Feb 04
Designing holes for M3 threaded inserts in an ABS enclosure
Hi! In my design for a small ABS enclosure for an onboard sensor module I want to switch from molded bosses to heat-set M3 inserts for the lid screws. Before I finalize CAD, what... read more
A
o
1
368
Dec 23
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
D
F
2
599
Dec 29