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 for the Finished Shapes of Internal and External Corners of Lathe 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 corners of less than C/R0.5 will have C/R 0.1 to 0.4 mm or light chamfering.
  • 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 match the 3D data.
  • When modelled with R0.5 mm or more, machining will be in match the 3D data.

Caution

Specification of “no chamfering” is not supported.

Notes

Outer diameter grooving

Inner diameter grooving

Points to Note on Centering Holes

A centering hole made in the end face is used to keep the workpiece in place and to prevent core deflection when turning the product.

Caution

  • “Centering 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 “Important Information” in the upper-left corner of the screen.

Notes

(1)When you select ”Remove centering hole”, an arrow will be shown on the model.
(2)When the model has an inner diameter, an arrow will not be shown on the model.

Points to Note on the Bottom of Holes (Turning/Milling)

A drill tip shape remains at the bottom of the hole (turning/milling).

Pattern A: The drill tip shape remains

Pattern B: The drill tip shape remains with no bottom

Pattern C: The drill tip shape remains even in the stepped area

Pattern D: The drill tip shape remains even in the stepped area, with no bottom

Notes

Machining drill reference photo

Details for Internal Corners of Cylindrical Shapes

See below for details and examples of differences between the model and the finished product.

Outer diameter

①”Corner R0″ is specified
 
  • When you want to minimize the corner R or specify a relief groove
  • → Select “Corner R0”
  • A relief groove will be machined to eliminate any radius left behind by the tool in the corner.

Tip

  • The width and depth of the relief added when selecting “Corner R0” can vary depending on the tools used. The exact dimensions cannot be specified.
  • ① Relief size when machining with R0.4 tools
  • ②Relief size when machining with R0.2 tools

Notes

In the following cases, “Corner R0” cannot be specified.
(1) The model has Corner R0.5 or greater (2) The model has a relief groove
②”Corner R0 to R0.4″ is specified
  • When the cylindrical corner can be any shape
  • → Select “Corner R0 to R0.4”.

Tip

  • Cylindrical corners with “Corner R0 to R0.4” can have the following shapes.
  • ① Radius from machine tool remains.
  • ② Relief groove is machined on the diameter only to achieve minimum clearance.
  • Machined diameter clearance groove.

    Groove Dimensions

  • ③ Relief groove is machined on the diameter and the face to achieve minimum clearance.
  • Machined diameter and face clearance grooves.

    Groove Dimensions

③Model has Corner R0.5 or more
If the corners are modeled with R0.5 or more, a relief groove will be machined to achieve minimum clearance.
  • Modeled radius exceeds R0.5
  • Machined diameter clearance groove.
  • Groove Dimensions

Inner diameter

Any of these corner conditions may be machined depending on the geometry.
  • Sharp Corner, R0
  • Undercut Groove
  • Undercut Groove with Lead

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 thread length with an incomplete threaded position is shown. See the example below.
  • *If the model shape does not satisfy the following table (1) to (4), we will process it according to our recommended value.

[mm]

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

Caution

④Models for which “pitch × 0.75” or less is set for the (4) minimum undercut depth value can be machined, but machine marks will remain.
  • 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 36.6mm = 44.6mm – 4.0(pitch) × 2.0 Example 2) Inner diameter specification: female screw thread depth 11.0mm = 15.5mm – (1.0(pitch) × 2.5 + 2.0)
Outer Diameter Inner Diameter

Caution

  • Modelled thread shape cannot be recognized. Specify the external thread and internal thread on the meviy screen.
  • ねじ部は対象外形状として認識

Points to Note on the Finished Shape of the End Face Groove Internal Corners

Please check the examples and notes for differences in the finished product.

3D 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

No R modeling is required. The shape is finished with a radius (R) ranging from 0.1 to 0.5.

Points to note regarding the finished shape of internal corners in pockets.

Please check the examples and notes for differences in the finished product.
  • Notch (pocket)
  • Desined with a radius (R) less than 0.5 mm, including sharp edges.
  • Actual finished shape after machining
  • *Finished with a radius (R) ranging from 0.1 to 0.5 mm.

Caution

  • The curved shape on the sides of the pocket is determined by the tool diameter, but we choose tools with the smallest possible diameter.
  • If there are any discrepancies between the model and the finished shape, we will contact you to discuss it after the order is placed.
  • ねじ部は対象外形状として認識

Points to Note for slitting process

  • The slitting process may change the dimensions of the part.
  • The dimensions of the following shapes are guaranteed based on measurements taken prior to slitting.