Difference in Shapes Between the 3D Model and the Finished Product

Although 3D CAD data will be used for manufacturing, the following cases may result in differences between the 3D model and the finished product.

Points to Note on the Finished Shape of Internal and External Corners of Turning parts

Please check the examples and notes for differences in the finished product.
Models with sharp edges
Models with internal corners of less than C0.5/R0.5
Actual finished shape after machining

Tip

The finish conditions are as follows.
  • Models with external edges of less than C/R0.5 will have C/R 0.1 to 0.4 mm or slight chamfer.
  • If the internal corners of the cylinder are less than 0.5 and there is no relief groove in the model, the tool edge will leave a corner of R0-R0.4mm.
    →Click here to specify “Corner R0” without modeling a relief groove.

Caution

  • When modelled with ≥C0.5 mm or more, machining will be in accordance with the 3D data.
  • When modelled with ≥R0.5 mm or more, machining will be in accordance with the 3D data.

Caution

Specification of “no chamfer” is not supported.

Notes

Outer diameter grooving

Inner diameter grooving

Points to Note on Center Holes

The center hole made in the end face is used to keep the workpiece in place and to prevent core deviation when rotating the product.

Caution

  • 「”Center hole cannot be left” can be selected, but there may be restrictions on the shapes that can be machined that make the option unavailable. When this occurs, check the “Precaution” in the upper-left corner of the 3D Viewer.

Notes

(1) If you select “Remove center hole”, an arrow will point to the part.
(2) If the component has an inner diameter, no arrow will point to the part.

Points to Note on the Bottom of Holes (Machined and Cut)

A drill tip shape remains at the bottom of the hole (machined and cut).

Pattern A: The drill tip shape remains

Pattern B: The drill tip shape remains with no bottom

Pattern C: The drill tip shape remains also in the stepped part

Pattern D: The drill tip shape remains also in the stepped part with no bottom

Points to note for cylinder edges with heat treatment and selected tolerances

  • For heat-treated cylinders with selected diameter tolerances, any undercuts (depth 0.025 mm) are set.
  • *Even without heat treatment, undercuts may occur depending on the shape and tolerance.

■ When tolerances are specified for "with heat treatment" and "diameter"

Caution

If runout machining is not permitted, send a request in the comments field.
  • Finished shape after machining
  • Detailed figure

Notes

If the radius was modeled with R0.5 or more, the shape looks like this.
  • Radius modeled with R0.5 or more
  • Finished shape after machining
  • Detailed figure

■ When tolerances are specified for " with heat treatment", "diameter" and "flange"

Caution

If undercuts are not permitted, please send a request in the comments field.
  • Finished shape after machining
  • Detailed figure
If you select “Corner R0” in the “External diameter information” dialog, it will be processed with an arbitrary relief groove (depth 0.5mm).
・ When you want to minimize the corner R or specify the relief groove ・ When the cylindrical corner can be any shape
　→ Select “Corner R0” 　→ Select “Corner Radius between R0 to R0.4”.

Notes

In the following cases, “Corner R0” does not apply.
(1) The model has corner R0.5 or greater (2) The model has a relief groove

Notes

At the bottom left of the 3Dviewer, you can see the handling information for the cylindrical corners.

Points to Note on Incomplete Threads

The required undercut shape (length and depth) to ensure the threaded portion length for an incomplete threaded position is shown. See the example below.

[mm]

External Thread Internal Thread
Modelling Without undercut
With undercut
(1) Lower limit for the length of the incomplete thread and the width of the undercut. Pitch × 2.0 Pitch × 2.5 + 2
(2) Lower limit of the length of the threaded (external thread) and the depth of the threaded (internal thread). Pitch × 2.0 Pitch × 2.0
(3) Chamfered edge Chamfered to prevent burr Chamfered to prevent burr
(4) Minimum undercut depth value Pitch × 0.75 Pitch × 0.75

Caution

Parts with “Pitch × 0.75” or less set to the minimum value for the undercut depth(4) can be machined, but thread marks may occur.
  • Reference model
  • Actual finished shape after machining

Tip

  • The [Notes] shown in the red box below describe the applicable thread length/thread depth.
Example 1) Outer diameter specification: male thread thread length 27.5mm – 1.5 (pitch) x 2.0 = 24.5mm Example 2) Inner diameter specification: female screw thread depth 30mm – (1.0(pitch) × 2.5 + 2.0) ＝ 25.5mm
内径情報指示

Caution

  • The thread shape cannot be identified. Set the outer and inner threads.
  • ねじ部は対象外形状として認識

Points to note for the finished shape of the end-face groove inner corners

Check the examples and notes for differences from the final product.
Model with sharp edges in end face groove
Actual finished shape after machining
"*Finished with a radius (R) ranging from 0.1 to 0.5 mm. "

Notes

Since the shape is finished to R0.1 to 0.5, no modelling is required. Design with sharp edges.

Points to Note for the Finished Shape of Pocket Internal Corners

Check the examples and notes for differences from the final product.
Notch (pocket)
Shape of less than R0.5 including sharp edges
Actual finished shape after machining
"*Finished with a radius (R) ranging from 0.1 to 0.5 mm. "

Caution

  • The machined curve on the sides of the pocket depends on the tool diameter, which is chosen as small as possible.
  • If there are any discrepancies between the model and the finished form, please feel free to let us know.
  • ねじ部は対象外形状として認識

Points to Note for Sliting processing

The dimensions of the parts may change as a result of the slitting process. Therefore, the dimensions of the following shapes are guaranteed based on the measurements taken before slitting.

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