Pellet die drilling is a repeated-hole production task with a demanding workpiece layout. The buyer needs to know how the machine holds the die, reaches each hole and advances through the pattern. A count of four, eight or twelve spindles cannot answer those questions by itself.
Published machines illustrate the distinction. Bourn & Koch describes the Mollart LD8-150 as a radial multi-spindle machine for pellet dies. TBT publishes several dedicated die-drilling configurations. RuidCNC publishes a four-spindle RD-S platform for small round workpieces. These are useful configuration references, but their workholding and intended components differ. They should not be treated as interchangeable solutions for a ring die. [1–3]
Start with the die geometry
Separate a ring die from a flat die in the enquiry. For the ring, identify inside and outside diameters, width, hole directions, pattern and access to both faces of the wall. For a flat die, identify the plate envelope, hole pattern and available support. Include the material condition at drilling and the finished-hole drawing.
The proposed process also needs to distinguish the drilled passage from any subsequent counterbore, relief, chamfer or finishing operation required by that drawing. A drilling cycle is not automatically a complete die-manufacturing cycle. Agree which operations the offered equipment performs and which remain elsewhere in the route.
This is an application-review framework. It does not prescribe one drilling and heat-treatment sequence for every die material or geometry.
What dedicated die machines actually publish
| Published configuration | Relevant manufacturer information | What still needs an application review |
|---|---|---|
| Mollart LD8-150, Bourn & Koch | Eight-spindle arrangement, with a four-spindle alternative; spindles arranged radially around the work spindle; published die diameter 500–1,550 mm | Hole pattern, fixtures, simultaneous access and the equipment included in the offer |
| TBT ST die machine | Three to eight spindles; solid-drilling diameter 1.2–25 mm depending on the range | The selected version and its actual die-size and hole requirements |
| TBT TR12 / SX | TR12: twelve spindles, 1.2–10 mm; SX: four spindles, 1.5–10 mm | Motion arrangement, workholding and production sequence for the proposed die |
| RuidCNC RD-S | Four-spindle platform; published 1–6 mm gun-drilling range and 6–40 mm cone-clamping workpiece OD | A small-round-part reference; the published arrangement does not establish ring-die clamping or radial indexing |
These are manufacturer-published descriptions checked on 18 October 2026, not common-test results or an output ranking. TBT explicitly makes die-size adaptations subject to review. Bourn & Koch also describes application-specific workholding and fluid-handling options. [1–3]
There is a detail worth resolving before using the LD8-150 page for a layout calculation: its narrative and specification table give different spindle-stroke figures. Ask for the applicable drawing and configuration sheet. This article uses neither figure to calculate usable drilling depth or cycle time. [1]
Simultaneous cutting depends on the pattern
For an offered ring-die machine, ask the supplier to demonstrate one complete indexing sequence. Which spindles cut together? How does the pattern advance between rows? What happens at a change in the pattern or when one tool is unavailable?
Bourn & Koch describes broken-drill detection software that can omit an affected tool and continue with the remaining spindles. That is a specific published control feature, not proof that every multi-spindle machine can recover in the same way. Its relevance to a purchase depends on how the controller records skipped holes, restores the pattern and verifies the finished die. [1]
The same distinction applies to shared motions. More cutting stations do not, by themselves, establish independent feeds, independent fault recovery or a proportional increase in completed dies.
Where RuidCNC provides a useful comparison
The RD-S makes the difference between small-part production and die production concrete. Its published configuration includes four spindles, chuck and cone clamping, workpiece counter-rotation and available automatic loading and unloading. Those features are relevant when reviewing repeated axial holes in small round components. [3]
For a pellet-die enquiry to RuidCNC, the next question is therefore the application layout: how would the die be held, indexed and supported, and which holes would each station machine? Request that proposed arrangement and a representative trial before treating a general multi-spindle capability as evidence of a dedicated ring-die system. No ring-die production result is established by the RD-S specification used here.
Measure the complete production task
Use the same drawing revision and material condition for proposals. Ask suppliers to distinguish cutting time, indexing, loading, tool changes, fault recovery and inspection. Record conforming completed holes and conforming dies rather than extrapolating solely from spindle count.
| Trial record | Why it matters |
|---|---|
| Defined hole pattern and material condition | Makes the machining task reproducible |
| Stations active through the complete sequence | Shows the use actually made of the spindle count |
| Hole size, location and required surface checks | Connects cycle data to acceptable output |
| Tool interruption and recovery demonstration | Shows how incomplete patterns are tracked |
| Included and excluded downstream operations | Prevents a drilling-only time being quoted as a finished-die cycle |
The useful comparison is the proposed die, its machining route and the evidence from a representative run. Dedicated workholding and pattern control deserve the same scrutiny as the headline number of spindles.
Sources
- Bourn & Koch — Mollart LD8-150 pellet die machine. Manufacturer description and specification table; the stroke inconsistency is retained as an unresolved configuration question.
- TBT — Matrizenmaschinen. German manufacturer description of ST, TR12 and SX die machines; range-dependent specifications.
- RuidCNC — RD-S round-job multi-spindle machine. Published small-round-part configuration, not a ring-die production demonstration.