Cone rolling requires a cone-specific application review, not just a cylindrical capacity rating. Confirm the developed blank, small-end geometry, material, machine configuration, supports and inspection plan before committing to a production setup or CNC program.
This guide helps Canadian fabricators prepare that review. It is not an operating program or a substitute for the selected machine's manual. Use our cone-rolling application checklist to organize the drawing and quotation requirements.
Define the cone geometry before developing the blank
For a cone frustum, state the small and large diameters and identify whether they are inside or outside measurements. Distinguish axial height from slant height. Supply material grade and condition, thickness, joint details and the required finished profile.
A right circular cone frustum normally develops as an annular sector, rather than a rectangular cylinder blank. Have the developed geometry, thickness reference and seam allowances checked against the drawing using the appropriate CAD or layout method. Offset transitions and other shapes need their own development.
The cylinder blank-length calculator is for cylinders and cylindrical arcs; it does not calculate cone blanks.
Confirm the forming arrangement and cone-specific capacity
Cone forming must accommodate different circumferential travel at the small and large ends. Approved arrangements may use inclined rolls and dedicated cone-guiding equipment; the required geometry and accessories depend on the machine. Tilting a roll alone does not establish that any cone can be produced.
Both 3-roll and 4-roll families can include cone-capable configurations. For RollTek VERTEX or TITAN, ask for written confirmation of the exact model, cone equipment, material, thickness, working width and small-end diameter. Confirm included versus optional equipment in the quotation. Do not assume that every model includes the same attachments or can roll cones at its cylindrical thickness rating.
A generic capacity reduction percentage is not a substitute for that approval. The proposed machine, cone geometry, end preparation and support arrangement must be reviewed together. See the capacity and pre-bending guide for the distinction between rating conditions.
What to confirm before saving a CNC program
- Which roll movements, inclination functions and positioning features the selected control actually supports.
- The approved end preparation, forming sequence and setup references for the representative blank.
- The required cone accessories, support locations and loading/removal arrangements.
- The trial material, inspection stage and accepted results associated with the program revision.
CNC can repeat supported programmed movements; it does not guarantee the finished geometry or automatically compensate for every material or setup change. Validate a representative trial before treating saved settings as a repeat-production recipe. Record approved corrections and revalidation conditions.
Include supports, handling and surface requirements
Define how the blank and formed part will be supported and removed, and identify who supplies each item of equipment. Review contact surfaces and protection for stainless or appearance-sensitive work. Agree the installation and operator-training scope in writing rather than assuming it is included with every quotation.
The supports and handling quotation guide helps separate forming supports from loading and lifting equipment. Our surface-finish acceptance guide covers the separate appearance review.
Inspect the cone and investigate mismatches
Check the small and large ends, intermediate profiles where specified, end flats, seam gap, mismatch and surface condition against the approved drawing. Record the support and restraint condition and whether the result is as rolled or after welding. Rolling a cone does not by itself establish pressure-vessel compliance or weld readiness.
A mismatch at one end does not identify a single fault. Review blank development, material variation, end preparation, machine setup, tracking, supports and springback. Do not assume that drifting roll inclination is always the cause. Use the springback guide and adapt the first-article record to the cone drawing.
Keep cone acceptance separate from a cylinder demonstration. Use the sample-acceptance guide to agree what the supplier will demonstrate and which items remain unresolved.
Check these out
Send your drawing for a model-specific application review.
RollTek VERTEX 3-roll plate rolls
Review the selected model’s rolling and pre-bending capability against your drawing. Agree end-flat, diameter and seam inspection requirements for the trial.
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RollTek TITAN 4-roll plate rolls
Discuss the configuration, supports and inspection condition for representative shells. Four rolls alone do not guarantee roundness or seam acceptance.
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