TRNC-255A and TRNC-255B both have a 255 mm worktable, but their catalogue dimensions, load limits, tilt ranges and weights differ. TRNC-321 has a 320 mm worktable. Compare the complete installation and machining requirement before choosing by diameter.
Key catalogue differences
| Selection item | TRNC-255A | TRNC-255B | TRNC-321 |
|---|---|---|---|
| Worktable diameter | 255 mm | 255 mm | 320 mm |
| Through-hole diameter | Not listed (—) | 100 mm | 100 mm |
| Table height, horizontal position | 400 mm | 330 mm | 350 mm |
| Center height at 90° | 400 mm | 235 mm | 255 mm |
| Tilting range | −30° to +120° | −40° to +120° | ±110° |
| Allowable load at 0°, horizontal | 100 kg | 140 kg | 200 kg |
| Catalogue tilting load | 75 kg | 80 kg | 100 kg |
| Net weight, motor excluded | 650 kg | 300 kg | 450 kg |
Source: the supplied TANSHING catalogue, printed pages 47–50 (PDF pages 25–26 in the supplied scan). Values are references for the catalogue configuration and require confirmation against the accepted order drawing. The tilting-load row is labelled 0°–90° and 0° to −90° on the TRNC-255A/255B sheet, and 0°–90° on the TRNC-321 sheet. Read these labels together with each model’s mechanical tilt range; they do not establish load capacity across the full travel. Confirm the required angle and load geometry. A dash is not a confirmed zero or proof of an available passage.
Same diameter does not mean the same installation
The two 255 mm models have different listed heights and unit weights. Include the rotary unit, motors, fixtures, workpiece and other equipment in the machine-table payload check. Separately check the rotary table’s workpiece-and-fixture load limits.
Review the exact drawings for the base, mounting interface, motor and cable envelope, tool access and the swept envelope at each required tilt angle. A lower table height or lower unit weight alone does not establish clearance or suitability.
Use the model comparison and dimensional references on our CNC 5-axis tilting rotary table page.
Match the load to the machining position
Add the workpiece, chuck, fixture and attached components. Use the load row corresponding to the operating position. Also confirm load offset, inertia, allowable moments, cutting forces and clamping conditions.
For an illustrative combined load of 90 kg, the catalogue horizontal-load values alone would leave all three models as candidates. In the catalogue tilting-load row, 90 kg exceeds the TRNC-255A and TRNC-255B values and is below the TRNC-321 value. This is a screening example, not application approval; the actual angle and load geometry still require review.
Verify the required tilt direction and through passage
State the actual angles needed and check the drawing’s sign convention. TRNC-321’s ±110° range is different from the −30°/+120° and −40°/+120° ranges of the 255 models. Confirm the part, fixture, spindle and machine enclosure remain clear throughout the intended movement.
If a through passage is required, describe its intended use and required clear diameter. TRNC-255B and TRNC-321 list a 100 mm through hole, but an installed fixture or another component may restrict the usable passage. TRNC-255A has a dash in this catalogue row; request confirmation rather than assuming a usable bore.
Separate 3+2 positioning from simultaneous machining
Two rotary axes do not by themselves establish simultaneous five-axis capability on the machine. Confirm the CNC control, enabled functions, drives, motors, encoders, interfaces and integration scope for the required operation.
For the broader decision between indexed positioning and simultaneous machining, read how to choose a CNC 5-axis rotary table. Confirm rotary-axis and tilt-axis specifications separately before ordering; the table above is not a complete performance specification.
Request a comparison for your machine and part
- Machine model, CNC controller and required machining mode.
- Required rotary and tilt angles, with the installation drawing.
- Part and fixture drawings, combined mass and load offset.
- Available mounting space, machine payload and travel limits.
- Required passage, clamping supply, quantity and destination.
Complete the technical inquiry worksheet, selecting the model under consideration. Save a PDF copy and email it with available drawings to sales@rotivex.com. Unknown details can be confirmed during review.
ROTIVEX coordinates technical confirmation and sourcing from Shanghai. Vera provides an initial reply within 12 hours; the final configuration, scope, quotation and timing follow technical review.
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