Mechanical & Civil Engineering
Deep Drawing Blank Diameter & Draw Ratio Calculator
Calculate the required blank diameter and check the limiting draw ratio for a deep drawing operation.
Your inputs
Change any value to update the result instantly.
Blank diameter
80 mm
Draw ratio
2
Limiting draw ratio
2.1
Feasible in one draw (1=yes,0=no)
1
What this calculator does
Deep Drawing Blank Diameter & Draw Ratio Calculator: Applies the standard shop-floor or joint-design relationship so the force, speed, allowance or strength can be worked out from the process inputs.
What your result means
The headline figure is the process setting or joint strength implied by your inputs. Treat it as a starting point to validate against the tool maker's data and a trial part.
Formula and working
D = √(d² + 4×d×h); LDR = D ÷ d
- 1
Collect the inputs
Finished cup diameter (d) = 40 mm; Cup height (h) = 30 mm; Material limiting draw ratio = 2.1
- 2
Apply the formula
D = √(d² + 4×d×h); LDR = D ÷ d
- 3
Result
Blank diameter = 80 mm
Frequently asked questions
Symbols and assumptions
- cupDiameter
- Finished cup diameter (d) (mm)
- cupHeight
- Cup height (h) (mm)
- limitingRatio
- Material limiting draw ratio
- • Nominal tooling, material and process conditions are assumed; machine, tool-wear and lubrication effects vary in practice.
- • Recommended cutting data always sits inside the tool maker's published envelope, which takes priority.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
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