Davenport Model B CNC Multi-Spindle Automatic Screw Machine
Key Specifications
Number of Spindles
Max Bar Diameter
Max Spindle Speed
Spindle Motor Power
Bar Feed Capacity
Cross Slides
Overview
The Davenport Model B CNC is the modernized version of the legendary five-spindle automatic screw machine that has been the backbone of the American screw machine industry for over a century. Originally introduced by the Davenport Machine Tool Company of Rochester, New York in the 1920s, the Model B architecture — five vertically oriented spindles in a radial drum — has proven so mechanically sound that the fundamental design remains in production today, with the original cam mechanisms replaced by servo-driven CNC axes in modern retrofit and new-build versions.
The Model B's five-spindle layout provides four simultaneous cutting positions plus a load/unload position, making it highly productive for small-to-medium complexity parts in bar stock up to 38 mm (1.5 inches) in diameter. The machine's compact footprint — small enough to fit two or three units in the floor space occupied by a single European six-spindle multi — makes it especially popular in screw machine shops where maximizing machines per square foot is a priority. Hundreds of Model B machines are currently running in production across North America, many with CNC retrofits that have extended their productive lives by decades.
CNC retrofits for the Model B are most commonly performed by Davenport Machine itself (now owned by Brinkman International), as well as by independent retrofit specialists. The standard CNC conversion replaces the cam drum with servo-driven cross slides and end-working units while retaining the proven cast-iron base, spindle drum, and indexing mechanism. Control systems vary by retrofit provider, with FANUC 0i-TF and Allen-Bradley PLC-based systems being most common in North America.
The Model B's enduring production and extensive North American installed base means that tooling, spare parts, and experienced operators are more accessible than for any other multi-spindle platform. For shops running small-to-medium volumes of precision screw machine parts in the under-38 mm range, the Model B CNC remains a cost-effective and highly practical production solution that continues to compete effectively against more expensive alternatives.
Full Specifications
| Parameter | Value |
|---|---|
| Number Of Spindles | 5 |
| Max Bar Diameter | 38 mm (1.50 in) |
| Max Spindle Speed | 7,200 RPM |
| Spindle Motor Power | 15–22 kW (20–30 hp, depending on retrofit) |
| Bar Feed Capacity | 3,000 mm (118 in) bar length |
| Cross Slides | 5 cross slides + 4 end-working positions |
| Control System | FANUC 0i-TF or Allen-Bradley (retrofit-dependent) |
| Machine Weight | Approx. 5,400 kg (11,900 lb) |
Strengths & Limitations
Strengths
- Compact five-spindle layout fits 2–3 machines in the floor space of a single large European multi-spindle
- Largest installed base and parts/tooling ecosystem of any multi-spindle platform in North America — support is widely available
- Lower entry cost than European competitors makes multi-spindle production economics accessible to smaller shops
- 7,200 RPM maximum spindle speed enables competitive surface finishes and cycle times on small-diameter parts
Limitations
- Five spindles versus six or eight on larger competitors limits the number of operations per cycle — complex parts may require secondary operations
- 38 mm maximum bar diameter is smaller than most competing multi-spindles, restricting the range of part families the machine can address
- Retrofit quality and age of base machine vary widely in the used market — thorough inspection and documentation are essential before purchase
Best For
Frequently Asked Questions
01
Brinkman International, current owner of the Davenport Machine brand, offers both new-build CNC Model B machines and factory-rebuilt/retrofitted units. New machines are built to order with full CNC from the ground up. The larger market, however, is in rebuilt and retrofit units given the vast installed base of legacy Model B machines throughout North America.
02
For a typical screw machine shop running parts in the 6–25 mm range with 4–6 operations, the Model B CNC is a very competitive choice. The lower capital cost, simpler five-spindle programming, and unmatched North American support network often outweigh the productivity advantage of a sixth spindle. For parts requiring more than six operations, or for larger-diameter bar stock, the six-spindle European machines become more compelling.
03
For a shop running 20+ million parts per year across two or three shifts, a CNC-retrofitted Model B typically achieves payback in 18–36 months. Key drivers are reduced setup time from CNC changeover, improved consistency reducing scrap rates, and the ability to run lights-out with bar feed automation. Shops with lower volumes may see payback periods of 3–5 years, which is still favorable compared to single-spindle turning center economics.
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Owner experience and review — Machine from hell (Davenport) : r/Machinists - RedditYo what’s up with that noise? Hey look at the OD ... - RedditLooking for opinions on screw machines : r/Machinists - RedditThis is the new hybrid Davenport. Average 2000 pieces 12 hours.Anybody else run screw machines
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Links to community discussions. Summaries are editorial — visit the original thread for full context.