Default General Tolerance Standards

The Machined plates service does not display dimensions or tolerances when 3D CAD data is uploaded other than diameter information and full length, assuming that the customer specifies the desired tolerances.
This section describes the finish of parts where dimensions and tolerances are not displayed.

Default General Tolerance Standards for Machined Dimensions (From Excerpts of JIS B 0405:1991/JIS B 0419:1991)

The following standards are applied to the origin according to machining standards.
The origin can be moved to any position.

Tolerances for Model Dimensions, Excluding Chamfer

[mm]

Tolerance Grade		Classification of Standard Dimensions
Symbol	Description	≥0.5 ≤3	>3 ≤6	>6 ≤30	>30 ≤120	>120 ≤400	>400 ≤1000
m	Medium	±0.1	±0.1	±0.2	±0.3	±0.5	±0.8

Tolerances for Chamfer Length Dimensions (Corner Radius and Corner Chamfer Dimensions)

[mm]

Tolerance Grade		Classification of Standard Dimensions
Symbol	Description	≥0.5 ≤3	>3 ≤6	>6
C	Rough	±0.4	±1	±2

Angle Dimensional Tolerances

Tolerance Grade		Length of the Shorter Angle Edge
Symbol	Description	≤10	>10 ≤50	>50 ≤120	>120 ≤400	>400
m	Medium	±1°	±30’	±20’	±10’	±5’

General Tolerances of Perpendicularity

[mm]

Tolerance Grade	Nominal Length of the Shorter Edge
Symbol	≤100	>100 ≤300	>300 ≤1000	>1000 ≤5000
K	0.4	0.6	0.8	1

*This does not apply if Hardening is included in the process.

Geometric Tolerance Precision Standards for Lathe Machining

The following tolerance values are also guaranteed for hardening. However, this may not apply for certain product shapes (for example thin-walled products, long products and products with a large removal rate).

[mm]

	Geometric Tolerance Completed on One Side with Maximum Diameter as the Origin		Geometric Tolerance for Both Sides with Maximum Diameter as the Origin
	Outer Diameter	Inner Diameter	Outer Diameter	Inner Diameter	L (Full Length)	K (Geometric Tolerance Value)
Perpendicularity					L ≦ 100	0.06
					100 < L ≦ 300	0.1
					300 < L ≦ 500	0.15
					L < 500	0.2
Coaxiality					L ≦ 100	0.1
					100 < L ≦ 300	0.2
					300 < L ≦ 500	0.3
					L < 500	0.5
Parallelism					L ≦ 100	0.06
					100 < L ≦ 300	0.1
					300 < L ≦ 500	0.15
					L < 500	0.2
Roundness

*Roundness should be equal to the dimensional tolerance value for the diameter, but it must not exceed the specified tolerance value of circular runout in the radial direction.
Example 1: Roundness 0.1 for diameter 100 without tolerance
Example 2: Roundness 0.04 for diameter 100 ±0.02

Tip

Reasons for disparities in precision between one side and both sides

- ■ One side

- Workpiece does not need replacing and machining is completed in one direction

- ■ Both sides

- Workpiece needs replacing and machining is in two directions

General Tolerances of Straightness and Flatness

[mm]

Tolerance Grade	Nominal Length
Symbol	≤10	>10 ≤30	>30 ≤100	>100 ≤300	>300 ≤1000
K	0.05	0.1	0.2	0.4	0.6

*This does not apply if Hardening is included in the process.

Resin Precision Assurance

Unlike metal, resin is a material that easily changes shape or dimensions due to factors such as temperature and humidity. Due to this, precision assurance is performed under the following conditions:

· Inspections are performed in temperature-controlled environments (23 to 24℃).
· Precision assurance is based on the results of inspections performed immediately before shipment.

Surface Roughness

The surface roughness reference value is √Ra6.3 (√Rz25).
The surface roughness is displayed in the lower left corner of the 3D viewer and the roughness symbol can be changed in user settings.
You can select √Ra6.3/3.2 for surface roughness in User Settings > Initial Quotation Settings

Tip

As shown in the figure below, you can select the value for surface roughness from √Ra6.3/3.2 in the tree view.

Outer corners, cylinder inner edge, chamfered edge

Parts with an edge of less than C/R0.5 have a chamfer between C/R 0.1 to 0.4 mm.
If the inner edge of the cylinder is smaller than 0.5, the finishing of the edge is R0.4 mm.

Caution

The specification “no chamfer” is not supported.