VALICALC / MECHANICAL ENGINEERING SUITE / DS24
Enter dimensional limits from your drawing or an authorized source. Worst-case interval arithmetic determines clearance and interference. A separate free-axial elastic Lamé model estimates minimum grip and maximum stress; no ISO fit table is invented or copied.
Verified mathematical models with explicit assumptions. Component capacity and applicability are shown as separate checks.
Labeled example inputs • SI calculations • Project revision 0 • No account or cloud upload
01 / ENGINEERING INPUTS
02 / CALCULATE → SELECT → RECALCULATE
Minimum operating diametral clearance
-0.05 mmMaximum operating diametral clearance
-0.01 mmGuaranteed minimum diametral interference
0.01 mmMaximum diametral interference
0.05 mmWorst-case stack lower limit
4.95 mmWorst-case stack upper limit
5.1 mmMinimum elastic interface pressure
26.25 MPaMaximum elastic interface pressure
131.25 MPaMinimum friction force criterion
11,875.22023 NRequired combined axial / torque force
6,666.66667 NPure-torque limit at minimum interference
178.1283 N·mIdeal maximum assembly sliding force
59,376.10115 NMaximum hub elastic von Mises
306.25 MPaMaximum shaft elastic von Mises
131.25 MPa| Stack component | Signed multiplier | Contribution lower (m) | Contribution upper (m) |
|---|---|---|---|
| 1 | 1 | 0.01 | 0.0101 |
| 2 | -1 | -0.00505 | -0.005 |
Interference from temperature-adjusted entered limits; no fit class recommendation.
Clearance or transition intervals cannot guarantee friction grip.
sqrt(Faxial² + (2T/d)²) ≤ μ pmin πdL under uniform full-contact Coulomb assumptions.
Linear elastic plane stress; maximum interference controls. No positive applicable limit was supplied.
Includes hollow-shaft inner surface hoop stress. No positive applicable limit was supplied.
Entered coefficients must be qualified. Plasticity, edge effects, centrifugal growth and noncircular features are omitted.
No approved current ISO 286 dataset has been supplied.
cmin = Dmin(T) − dmax(T); cmax = Dmax(T) − dmin(T). Zero is included in the transition/boundary classification.
Diametral interference δ = p d [(Ch+νh)/Eh + (Cs−νs)/Es]. The factor of two from radial interference is explicitly absorbed into d.
Free-axial Lamé pressure, radial/hoop stress and friction are mathematical estimates. Combined transmitted loads use the minimum pressure; maximum pressure controls elastic stress.
Dimensional limits and expansion coefficients are supplied inputs, not an authorized fit-class recommendation. Worst-case stacks assume independent bounded dimensions, with no probabilistic distribution.
Lamé pressure uses nominal circular contact diameter, separate E/ν, free axial strain and uniform full contact. Roughness flattening, plasticity, end effects, centrifugal growth and local keyways are omitted.
Combined axial/torque friction demand is checked at minimum positive interference; transition/clearance fits guarantee no grip. Friction and thermal examples are assumptions. Assembly force is an ideal estimate, not a press installation procedure.
Hole 30.000–30.020 mm and shaft 30.030–30.050 mm at equal temperature give 0.010–0.050 mm diametral interference. Min interference controls grip; max interference controls elastic stress. A hotter hub increases its hole limits and may remove guaranteed grip.
User-supplied dimensional intervals, linear expansion and signed worst-case interval stacks; no standard tolerance table or probabilistic assumption.
Independent interval arithmetic and linear thermal strain; Dornfeld press-fit notes, p17.
Free-axial, linear elastic, concentric uniform contact. Friction demand √(Fax²+(2T/d)²) ≤ μpminπdL. Maximum Lamé stress at maximum interference is checked separately.
Textbook references identify the method context. Historical numerical catalog, material and service-factor tables have not been copied or treated as current product ratings.
Existing component-selection Jobs → · All mechanical worksheets →
No. The worksheet separates mathematical results from criterion-specific checks. Actual motor, belt, gear, shaft, bearing and joint capacity need applicable current source data and engineering review.
The worksheet recalculates the outputs and geometry from the entered actual dimensions or discrete tooth/link count. Dependent checks are reevaluated; previously saved results are not restored as approvals.