Kent CNC BM-3
Image: kentusa.com, Kent CNC
Key Specifications
Max Spindle
Spindle Taper
Table Size
Spindle Power
x axis travel
y axis travel
How much does the Kent CNC BM-3 cost?
Price estimate
We do not have a price for the Kent CNC BM-3 that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Kent CNC BM-3 is a 3-axis CNC mill with a quill head, 30 x 16 x 22 in (762 x 406 x 559 mm) of X, Y and Z travel, a 10 x 50 in (254 x 1,270 mm) table and a 3 hp (2.2 kW) R8 spindle that runs to 4,500 rpm. It can be worked three ways: as a manual machine with DRO, through conversational programming, or from G-code.
That range of operating modes comes from the Acu-Rite MillPwr-G2 control, a 3-axis conversational unit with a 12.1 in color LCD. Programs and data move through dual USB ports at the front and back, Ethernet or RS-232. An Intek control is listed as the option.
The head keeps the feel of a manual mill. The quill is 3-3/8 in (86 mm) in diameter with 5 in (127 mm) of travel and three power feeds of 0.0017, 0.0032 and 0.0054 in/rev. Listed capacities are 1 in (25 mm) for manual drilling, 0.37 in (9 mm) for power drilling, 6 in (152 mm) for boring and 2.5 in³/min (41 cm³/min) for milling. Those are light-duty figures, as a 3 hp (2.2 kW) R8 spindle would suggest; a #30 taper is the option. The speed range is given as 60-550-4,500 rpm.
Where the BM-3 differs from Kent CNC's KTM-3VKF, which shares the table size, spindle power and top speed, is in what it carries. The BM-3 takes 1,480 lb (671 kg) distributed on the table and weighs 3,960 lb (1,796 kg). The KTM-3VKF is rated at 850 lb (386 kg) at the table center and weighs 3,100 lb (1,406 kg). With 22 in (559 mm) of Z travel and 2 to 24 in (51 to 610 mm) between spindle nose and table, the BM-3 also has room for tall fixtures and long drills. Spindle center to column is 17.8 in (452 mm), and the table has three 5/8 in T-slots.
The listed supply is 220 volts, 60 Hz, 3-phase, 60 Amps. Shipping weight is 4,100 lb (1,860 kg) in a 98 x 58 x 83 in (2,489 x 1,473 x 2,108 mm) package.
Full Specifications
| Parameter | Value |
|---|---|
| X Axis Travel | 30 in (762 mm) |
| Y Axis Travel | 16 in (406 mm) |
| Z Axis Travel | 22 in (559 mm) |
| Table Size | 10 x 50 in (254 x 1,270 mm) |
| T-Slots | 3 x 5/8 in |
| Distance Spindle Nose to Table | 2-24 in (51-610 mm) |
| Spindle Center to Column | 17.8 in (452 mm) |
| Quill Travel | 5 in (127 mm) |
| Quill Diameter | 3-3/8 in (86 mm) |
| Spindle Motor Power | 3 hp (2.2 kW) |
| Spindle Taper | R8 (#30 optional) |
| Spindle Speed Range | 60-550-4,500 rpm |
| Max Spindle Speed | 4,500 rpm |
| Quill Power Feed | 0.0017 / 0.0032 / 0.0054 in/rev |
| Drilling Capacity Manual | 1 in (25 mm) |
| Drilling Capacity Power | 0.37 in (9 mm) |
| Boring Capacity | 6 in (152 mm) diameter |
| Milling Capacity | 2.5 in³/min (41 cm³/min) |
| Max Table Load | 1,480 lb (671 kg) distributed |
| Coolant Pump | 0.25 hp (0.2 kW) |
| CNC Control | Acu-Rite MillPwr-G2 3-axis conversational, 12.1 in color LCD (opt. Intek) |
| Operating Modes | Manual/DRO, conversational, and G-code |
| Connectivity | Dual USB (front/back), Ethernet, RS-232 |
| Machine Weight | 3,960 lb (1,796 kg) |
| Shipping Weight | 4,100 lb (1,860 kg) |
| Packing Dimensions | 98 x 58 x 83 in (2,489 x 1,473 x 2,108 mm) |
| Power Requirement | 220 volts, 60 Hz, 3-phase, 60 Amps |
Specifications sourced from kentusa.com — verified 2026-10-03
Strengths & Limitations
Strengths
- Runs as a manual/DRO machine, conversationally or from G-code on the Acu-Rite MillPwr-G2 control
- 22 in (559 mm) of Z travel with 2-24 in (51-610 mm) from spindle nose to table
- Table load of 1,480 lb (671 kg) distributed, against 850 lb (386 kg) at the center on the KTM-3VKF
- Quill with 5 in (127 mm) of travel and power feeds of 0.0017 / 0.0032 / 0.0054 in/rev
- Dual USB, Ethernet and RS-232 connections for program transfer
Limitations
- 3 hp (2.2 kW) spindle with a listed milling capacity of 2.5 in³/min (41 cm³/min)
- R8 taper as standard (#30 optional), which limits tool size and rigidity
- The table lists no automatic tool changer, so tools are changed by the operator
- Top speed of 4,500 rpm, against 6,000 rpm on the TW-32Qi
- The table is 10 in (254 mm) wide against 16 in (406 mm) of Y travel
Best For
Frequently Asked Questions
01
The Acu-Rite MillPwr-G2, a 3-axis conversational control with a 12.1 in color LCD. The listed operating modes are manual/DRO, conversational and G-code, and connectivity is dual USB (front and back), Ethernet and RS-232. An Intek control is the listed option.
02
X travel is 30 in (762 mm), Y travel 16 in (406 mm) and Z travel 22 in (559 mm). The table is 10 x 50 in (254 x 1,270 mm) with three 5/8 in T-slots. The quill adds 5 in (127 mm) of travel, and spindle nose to table distance ranges from 2 to 24 in (51 to 610 mm).
03
Both have a 10 x 50 in (254 x 1,270 mm) table, a 3 hp (2.2 kW) spindle and a 4,500 rpm top speed. The BM-3 is the heavier machine at 3,960 lb (1,796 kg) and takes 1,480 lb (671 kg) distributed on the table. The KTM-3VKF weighs 3,100 lb (1,406 kg) and is rated at 850 lb (386 kg) at the table center.
04
Kent CNC lists a milling capacity of 2.5 in³/min (41 cm³/min), a drilling capacity of 1 in (25 mm) by hand feed and 0.37 in (9 mm) under power feed, and a boring capacity of 6 in (152 mm) in diameter. The spindle is 3 hp (2.2 kW) with an R8 taper, or #30 as an option.
05
The table lists 220 volts, 60 Hz, 3-phase, 60 Amps. The machine weighs 3,960 lb (1,796 kg) and ships at 4,100 lb (1,860 kg) in a 98 x 58 x 83 in (2,489 x 1,473 x 2,108 mm) package. The coolant pump is 0.25 hp (0.2 kW).
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