HiTorque Mini Mill with R8 Spindle and Drill Chuck – Power, Torque, and a larger table than other mills in its class, LittleMachineShop.com (3990)

Product Description

LittleMachineShop.com HiTorque 3990 Mini Mill

Features suitable for home shops as well as commercial and educational use.
A solid combination of features designed to make this mini mill a stand-out in its class.

Most powerful mini milling machine in its class.
Most low-end torque in its class.
No gears in spindle drive.
Largest table and X-Y travel in its class.
R8 spindle and drill chuck.

A Note on Shipping!

*NOTE* We only ship machines to the lower 48 U.S. states via Amazon! To ship to Hawaii, Alaska or Canada, visit our website.

Machines ship by truck freight. To arrange delivery, the trucking company needs your phone number and email address. This information is not made available to us.

After receiving your order, we will attempt to reach you via Amazon to request your direct contact information. To avoid delays, please reply to our email, or contact LittleMachineShop.com to provide us with this information. Failure to acquire this information may result in your order being canceled.

R8 mini mill factory customized to give you the best features!
Designed by LittleMachineShop.com and SIEG as an industry standard for mini mills.

The LittleMachineShop.com HiTorque Mini Mill has the most power, most torque, and a larger table than other mills in its class. This mill has a solid column. It does not tilt from side to side. This construction is significantly stiffer than the tilting column on other mini mills. This model also includes the air spring head support for even support through the Z-axis range of travel.

Powered to Perform.

The 500W brushless spindle drive motor provides tremendous low-end torque. And you can vary the speed from 50 rpm to 2500 rpm continuously. There are no gears to shift. And, with no gears, the HiTorque Mini Mill is the quietest in its class.

The large mill table provides 50% more table area than other mini mills. It also has 30% more travel in each direction. The feed dials can be zeroed at any point.

The HiTorque Mini Mill has drill press handles for drilling and fast motion of the mill’s head. It also has Z-axis fine feed with 0.001″ resolution for milling operations.

LittleMachineShop.com HiTorque 3990 Mini Mill

Front view of the LittleMachineShop.com HiTorque 3990 Mini Mill showing air spring, 18.1″ x 4.7″ table, 500W brushless motor and R8 spindle.

LittleMachineShop.com HiTorque 3990 Mini Mill

Alternate view of the LittleMachineShop.com HiTorque 3990 Mini Mill where you can see the power box with speed control knob and on/off power switch.

HiTorque 3990 Mini Mill LittleMachineShop.com – Head

Closeup view of headstock, motor and R8 spindle on the solid column HiTorque 3990 mini mill by LittleMachineShop.com

HiTorque 3990 – Front View

HiTorque 3990 – Side View

HiTorque 3990 – Head

Features: HiTorque Mini Mill – 3990 from LittleMachineShop.com

500 Watt output spindle motor
Large X-Y table
R8 Spindle – Includes R8 to 33JT drill chuck arbor and 1/2″ drill chuck
Solid column with Dovetail to maintains head alignment at any height
Gas strut provides even support through the Z-axis range
Fine feed on Z-axis and three radial handles for drilling
Adjustable Z-axis stop for repetitive drilling
Neoprene bellows protect horizontal ways
Adjustable gibs on all dovetail ways
E-stop safety power switch

Technical Specs of the HiTorque Mini Mill – 3990

End Milling Capacity
0.6″ (16 mm)

Face Milling Capacity
1.2″ (30 mm)

Drilling Capacity
0.5″ (13 mm)

Table Size
18.1″ x 4.7″ (460 mm x 120 mm)

T-Slots
3 slots 0.47″ (12.0 mm) wide

Travel
X-Axis: 11.8″ (300 mm) / Y-Axis: 5.1″ (130 mm) / Z-Axis: 10.6″ (270 mm)

Throat
6.5″ (165 mm)

X- and Y-Axis Feed Screws
0.062″ (1.59 mm) per rotation

Positioning Accuracy
0.0004″ (0.010 mm)

Spindle Taper
R8

Spindle Motor & Speed
0.67 hp (500 Watts) / 100 – 2500 RPM

Power
120 V 60 Hz 8 Amps

Weight
Machine: 124 lbs (56 kg) / Crated for Shipping: 177 lbs (80 kg)

Dimensions
Overall (W x D x H): 23.2″ x 19.7″ x 36.3″ (590 mm x 500 mm x 922 mm) / Base (W x D): 8.5″ x 14.2″ (216 mm x 362 mm) / Crated for Shipping (W x D x H): 23.6″ x 25.0″ x 29.9″ (600 mm x 635 mm x 760 mm)

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Customer Reviews

4.4 out of 5 stars

7

5.0 out of 5 stars

11

4.7 out of 5 stars

6

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Price
$104.95$104.95
$251.95$251.95
$399.95$399.95
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Collet Set

Set of 5 R8 Collets
Set of 7 R8 Collets
Set of 7 R8 Collets
Set of 13 Professional Grade R8 Collets

Center Drills

Set of 4 (Numbers 1-4) HSS Center Drills
Set of 5 (Numbers 1-5) HSS Center Drills
Set of 5 (Numbers 1-5) HSS Center Drills
Set of 5 (Numbers 1-5) Cobalt Center Drills

End Mills

10 pieces 2 & 4 Flute, TiN coated HSS End Mills
20 pieces 2 & 4 Flute, TiN coated HSS End Mills
20 pieces 2 & 4 Flute, TiN coated HSS End Mills
20 pieces 2 & 4 Flute, TiN coated HSS End Mills

T-Slot Cleaner for 7/16″ T-Slot
7/16″ T-Slot Cleaner
7/16″ T-Slot Cleaner
7/16″ T-Slot Cleaner
7/16″ T-Slot Cleaner
7/16″ T-Slot Cleaner

Edge & Center Finder
Edge and Center Finder, 3/8″ Shank
Edge and Center Finder, 3/8″ Shank
Edge and Center Finder, 3/8″ Shank
Edge and Center Finder, 3/8″ Shank
Edge and Center Finder, 3/8″ Shank, Fisher

1-2-3 Blocks
Pair of 1-2-3 Blocks

Pair of 1-2-3 Blocks
Pair of 1-2-3 Blocks
Pair of 1-2-3 Blocks Ultra Precision

Thin Parallels
6″ Long, 10 Pairs
3″ Long, 4 Pairs
3″ Long, 11 Pairs with box
3″ Long, 11 Pairs with box
3″ Long, 10 Pairs, Ultra-Precision with box

Clamping Kit
58 Piece 7/16″ T-Slot
58 Piece 7/16″ T-Slot
58 Piece 7/16″ T-Slot
58 Piece 7/16″ T-Slot
58 Piece 7/16″ T-Slot, Professional Grade

Vise

3″ Precision Milling Vise
3″ Precision Milling Vise, Heavy, No Swivel Base
3″ Screwless Vise
3″ Precision Milling Vise, Professional Grade

Vise Mounting

Vise Mounting Kit, 7/16″ T-Slot
Vise Mounting Kit, 7/16″ T-Slot
Clamps, Screwless Vise
Vise Mounting Kit, 7/16″ T-Slot

Add to Cart

Add to Cart

Customer Reviews

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4.7 out of 5 stars

5

4.3 out of 5 stars

18

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Price
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$999.00$999.00
$1,299.00$1,299.00
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Milling & Drilling Capacities
End Milling 0.4″ (10 mm) / Face Milling 0.6″ (16 mm) / Drilling 0.4″ (10 mm)
End Milling 0.6″ (16 mm) / Face Milling 1.2″ (30 mm) / Drilling 0.5″ (13 mm)
End Milling 0.6″ (16 mm) / Face Milling 1.2″ (30 mm) / Drilling 0.5″ (13 mm)
End Milling 0.6″ (16 mm) / Face Milling 1.2″ (30 mm) / Drilling 0.5″ (13 mm)
End Milling 0.6″ (16 mm) / Face Milling 2.0″ (50 mm) / Drilling 0.8″ (20 mm)

Table Size and T-Slots
Table 15.7″ x 5.7″ (400 mm x 145 mm) / 3 T-Slots 0.31″ (8.0 mm) wide
Table 18.1″ x 4.7″ (460 mm x 120 mm) / 3 T-Slots 0.47″ (12.0 mm) wide
Table 18.1″ x 4.7″ (460 mm x 120 mm) / 3 T-Slots 0.47″ (12.0 mm) wide
Table 18.1″ x 4.7″ (460 mm x 120 mm) / 3 T-Slots 0.47″ (12.0 mm) wide
Table 23.4″ x 5.5″ (595 mm x 140 mm) / 3 T-Slots 0.47″ (12.0 mm) wide

Travel
X-Axis: 11.8″ (300 mm), Y-Axis: 5.9″ (150 mm), Z-Axis: 8.7″ (220 mm)
X-Axis: 11.8″ (300 mm), Y-Axis: 5.1″ (130 mm), Z-Axis: 10.6″ (270 mm)
X-Axis: 11.8″ (300 mm), Y-Axis: 5.1″ (130 mm), Z-Axis: 10.6″ (270 mm)
X-Axis: 11.8″ (300 mm), Y-Axis: 5.1″ (130 mm), Z-Axis: 10.6″ (270 mm)
X-Axis: 15.6″ (395 mm), Y-Axis: 6.7″ (170 mm), Z-Axis: 11.6″ (295 mm) / Quill Travel 2.8″ (71 mm)

X- and Y-Axis Feed Screws
0.050″ (1.27 mm) per rotation
0.062″ (1.59 mm) per rotation
0.062″ (1.59 mm) per rotation
0.062″ (1.59 mm) per rotation
0.100″ (2.54 mm) per rotation

Max Spindle to Table, Throat
9.6″ (245 mm) / 5.5″ (140 mm)
11.5″ (292 mm) / 6.5″ (165 mm)
11.5″ (292 mm) / 6.5″ (165 mm)
11.5″ (292 mm) / 6.5″ (165 mm)
12.2″ (310 mm) / 7.5″ (190 mm)

Positioning Accuracy
0.0004″ (0.010 mm)
0.0004″ (0.010 mm)
0.0004″ (0.010 mm)
0.0004″ (0.010 mm)
0.0004″ (0.010 mm)

Spindle Taper
2 Morse Taper
R8
R8
R8
R8

Motor, Speed, and Power
0.34 hp (250 Watts) / 100 – 5000 RPM / 120 V 60 Hz 5 Amps
0.47 hp (350 Watts) / 100 – 2500 RPM / 120 V 60 Hz 5 Amps
0.67 hp (500 Watts) / 100 – 2500 RPM / 120 V 60 Hz 5 Amps
0.67 hp (500 Watts) / 100 – 2500 RPM / 120 V 60 Hz 5 Amps
1.01 hp (750 Watts) / 0 – 2000 RPM / 120 V 60 Hz 5 Amps

Weight
Machine: 106 lbs (48 kg) / Crated for Shipping: 117 lbs (53 kg)
Machine: 126 lbs (57 kg) / Crated Weight: 177 lbs (80 kg)
Machine: 124 lbs (56 kg) / Crated for Shipping: 177 lbs (80 kg)
Machine: 124 lbs (56 kg) / Crated for Shipping: 177 lbs (80 kg)
Machine: 207 lbs (94 kg) / Crated for Shipping: 262 lbs (119 kg)

Dimensions
Overall (W x D x H): 20.5″ x 19.3″ x 28.7″ (520 mm x 490 mm x 730 mm) / Base 8.5″ x 14.0″ (216 mm x 356 mm)
Overall (W x D x H): 23.2″ x 19.7″ x 36.3″ (590 mm x 500 mm x 922 mm) / Base (W x D): 8.5″ x 14.2″ (216 mm x 362 mm) / Crated for Shipping (W x D x H): 23.6″ x 25.0″ x 29.9″ (600 mm x 635 mm x 760 mm)
Overall (W x D x H): 23.2″ x 19.7″ x 36.3″ (590 mm x 500 mm x 922 mm) / Base (W x D): 8.5″ x 14.2″ (216 mm x 362 mm) / Crated for Shipping (W x D x H): 23.6″ x 25.0″ x 29.9″ (600 mm x 635 mm x 760 mm)
Overall (W x D x H): 23.2″ x 19.7″ x 36.3″ (590 mm x 500 mm x 922 mm) / Base (W x D): 8.5″ x 14.2″ (216 mm x 362 mm) / Crated for Shipping (W x D x H): 23.6″ x 25.0″ x 29.9″ (600 mm x 635 mm x 760 mm)
Overall (W x D x H): 28.9″ x 25.0″ x 28.5″ (735 mm x 635 mm x 725 mm) / Base (W x D): 9.1″ x 16.9″ (230 mm x 430 mm) / Crated for Shipping (W x D x H): 32.0″ x 28.0″ x 35.5″ (813 mm x 711 mm x 902 mm)

Overview: The HiTorque Mini Mil has a 500W brushless spindle drive motor providing tremendous low-end torque and variable speeds from 100-2500 RPM continuously. The mill has a solid column and air spring head support. There are no gears to shift which reduces noise and improves performance. The table is 18.1″ x 4.7″ (460 mm x 120 mm) and 30% more travel than competitors. Also, resettable feed dials zero at any point, drill press handles and a Z-axis fine feed with 0.001″ resolution.
Features: 500 watt brushless motor, large X-Y table, R8 spindle, solid column, gas strut on Z-axis, Z-axis fine feed, e-stop safety switch, adjustable z-axis stop, adjustable gibs, R8 to 33JT drill chuck arbor with 1/2″ drill chuck, and three radial handles for drilling.
Included Items: Mini Mill Users Guide, two T-slot nuts, two end wrenches, four hex (Allen) wrenches, one spanner wrench, oil can (plastic), one 1/2″ drill chuck, and R8 arbor.
Tips: This mill has a solid column. While a tilting column seems to be a feature, they are easily knocked out of tram and less rigid. While it is harder to tram in the X-axis because you must use shims, it is not as easy to knock it out of tram. The solid column has thicker walls than the tilting column, and a stiffer joint where it joins the base, so the column is significantly more rigid than the tilting column. That is why all mills from LittleMachineShop.com are solid column.
About Us – LittleMachineShop.com is a small U.S. business specializing in sourcing and selling quality machines, tooling, parts, and accessories for home shop machinists and small machine shops. Additionally, we sell upgrades and accessories for many of the leading brands. Whenever possible, we work with, and promote, other small US machinists and machine shops who sell innovative products. With direct US-based customer support from our knowledgeable team, we stand behind all our products.
Contact Us: We understand how information aids in your buying decision. We also know how frustrating it is if you cannot contact a company. If you have any questions, please feel to reach out to us and we would be happy to help. Should you have any doubts before buying a product, contact us to discuss compatibility or features. In the event you need to return something, we also ask for the courtesy of a contact to see if we can eliminate any possible issues.