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Mini Mill Comparison

This chart compares the specifications of the major brands of the mini mill. Bold rows highlight what we feel are significant differences, rather than mistakes or variations in measurement.

 Mini mills are sold by Grizzly, Harbor Freight, Homier, and Micro-Mark
  Grizzly Industrial, Inc. Harbor Freight Tools Micro-Mark Homier Mobile Merchants ToolsNow.com (Cummins Industrial Tools)
Brand Grizzly Central Machinery MicroLux Speedway ToolsNow (Cummins)
Model G8689 44991 82573 03947 7877
Price Lookup Lookup Lookup Lookup Lookup
Table 3-5/8″ x 15-3/4″ 3-11/16″ x 15-7/8″ 3-3/4″ x 16″ 3- 11/16″ x 15- 7/8″ 3- 11/16″ x 15- 7/8″
T-slots 12mm (7/16″) 1/2″ (Probably incorrect)   1/2″ (Probably incorrect)  
Spindle Taper #3 Morse Taper R8 Taper #3 Morse Taper R8 Taper R8 Taper
Drilling Capacity 1/2″ 1/2″     1/2″
Face Milling Capacity 1″ 1″   1" 1"
End Milling Capacity 1/2″ 1/2″     1/2″
Swing 12-3/4″ 12″ 12″ 12"  
Spindle Clearance 11-1/2″ 12-1/4″ (10 1/2″ measured) 11″    
Head Tilt 45° 45° 45°   45°
Spindle Stroke 5″ 8.5″ 7″   8.5″
X-Axis Travel 9-1/4″ 9″ 8″   9"
Y-Axis Travel 4″ 4″ 4″   4"
Spindle Speed 0-1100, 0-2500 RPM 0-1100, 0-2500 RPM 0-2500 RPM 0-1100, 0-2500 RPM 0-1100, 0-2500 RPM
Horsepower 3/4 HP
(350W motor) 		4/5 HP
(350W motor) 		0.47 HP
(350W motor) 		4/5 HP
(350W motor) 		350W
X & Y-Axis Dials 0.0625″ / Turn 0.0625″ / Turn 0.050″ / Turn 0.0625″ / Turn 0.0625″ / Turn
Z-Axis Dial 0.060″ / Rev, 0.002 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations 0.060″ / Turn, 0.001 Graduations

All the mini mills listed on this page are made in the same factory in China. Except where they have different features, the parts are interchangeable. In our experience there is not a noticeable quality difference between the brands.

Grizzly Industrial, Inc. sells the Grizzly model G8689 mini mill. The Grizzly mini mill has a 3 Morse taper spindle. It comes with two 3 Morse taper collets; a 3/8 inch collet and a 1/2 inch collet.

Harbor Freight Tools distributes the Central Machinery model 44991 mini mill. The Harbor Freight mini mill has an R8 spindle.

Micro-Mark carries the MicroLux model 82573 mini mill. The Micro-Mark mini mill has a 3 Morse taper spindle. The MicroLux mini mill has one unique feature; the table feed dials both advance 0.050 inch per revolution. On all the other mini mills the dials advance 1/16 inch per revolution. The 0.050-inch per turn is easier to use than the 0.0625-inch per turn of the other mini mills. Micro-Mark will have you believe that the other mini mills have metric dials, but they do not.

Homier Mobile Merchants sells the Speedway mini mill model 03947. The Homier mini mill has an R8 spindle.

ToolsNow.com (Cummins Industrial Tools) sells the mini mill model 7877. The ToolsNow mini mill has an R8 spindle.

This information is put together from published specifications and by measurements made by users of the machines. It is believed to be accurate, but there are no guarantees.
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