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Sphere Machines and Bead Mills

Covington Bead Mills

Covington Bead Mills do not produce perfectly round beads, but they do make excellent nuggets and freeform shapes. The closer one preforms the material before using the bead mill, the closer the finished product will be to your desired shape.

Covington Bead Mills make beads from 5/16" to 3/4" in diameter. The amazing machine will accommodate up to twenty 1/2" beads at a time. Polishing must be accomplished in a tumbler. We suggest a vibratory style tumbler. You can check out vibratory tumblers on our Tumblingmachines.com website.

Rough material must be cubed slightly larger than the finished size before inserting into the Covington Bead Mill. Silicon Carbide grits are used to shape the rough into round shapes. Different types of material requires different grits, milling times, etc. So, a bit of experimenting is necessary to get uniform results.

Model 1039 is a single speed machine and Model 1040 has two speeds (250 RPM and 380 RPM). The single speed on the Model 1039 does not allow proper preforming of material softer than Moh's 5. The slower speed of the Model 1040 allows better control for preforming soft material and for finer grits on hard material.


The aluminum milling head (circular piece on top) is held down with the straight bar (in back) and two weights shown in front. The workpieces are then ground/rotated between the milling head and rotating bead chamber.
Covington Model 1039 and Model 1040 Bead Mills
Item
List Price
Our Price
Model 1039 Single Speed Bead Mill
$650.00
$529.00
Model 1040 Two Speed
$775.00
$614.00
BC1039 Extra 5" Aluminum Bead Chamber
$145.00
$137.00
MH1039 Extra 5" Aluminum Milling Head
$39.00
$36.75

Covington Model 382 Small Sphere Machine



Closeup of cutting cups with marble.

Even though this is called the "Small Sphere Machine", this is a heavy duty piece of equipment. It makes spheres from 1/4" to 1" (6.3mm to 25.4mm) in diameter. The Covington Little Sphere Machine has the following features:

  • 1/18 HP motor
  • 2 Heads
  • Automatic Grit Application
  • Spring Loaded Heads (so constant adjustment is not needed)
  • Ajustable Cutting Angle
  • Grit Pan
  • Instructions
  • Set of 1/4", 3/8", 5/8" and 7/8" cups
Covington Model 382 Small Sphere Machine
Item
List Price
Our Price
Model 382 Small Sphere Machine
604.95
$532.00

Extra Cutting Cups for Model 382 Small Sphere Machine
Item
Our Price
SSM001 Pair of 1/4" Cups
$5.00/pair
SSM002 Pair of 3/8" Cups
$5.50/pair
SSM003 Pair of 5/8" Cups
$6.00/pair
SSM004 Pair of 7/8" Cups
$6.50/pair
SSM005 Pair of Each Size Cups (1/4, 3/8, 5/8 & 7/8")
$20.50/pair

Covington Model 381 Large Sphere Machine

This is a industrial grade machine for producing large spheres. It makes spheres from 1-1/4" to 9" in diameter. The Covington Large Sphere Machine has the following features:

  • 1/3 HP motor
  • 2 Heads
  • Automatic Grit application with slurry bowl
  • Shielding for Arbor and Bearings
  • Metal Cabinet with Shelf
  • Spring Loaded Heads (so constant adjustment is not needed)
  • Ajustable Cutting Angle
  • 2 Grit Pans
  • Instructions
  • Choice of size of one pairCutting Cups.
  • Please include Cup Size when ordering.
  • 2 Polishing Buffs.
Covington Model 381 Large Sphere Machine
Item
List Price
Our Price
Model 381 Large Sphere Machine
$1745.00
$1506.00

Extra Cutting Cups for Model 381 Large Sphere Machine
Item
List Price
Our Price
LSM201 Pair of 1" Cutting Cups for spheres from 1-1/4" to 2"
$22.00/pair
$20.95/pair
LSM202 Pair of 1-3/8" Cutting Cups for spheres from 2" to 3"
$27.00/pair
$25.95/pair
LSM203 Pair of 2-3/8" Cutting Cups for spheres from 3" to 5"
$33.00/pair
$30.95/pair
LSM204 Pair of 3-3/8" Cutting Cups for spheres from 5" to 7"
$45.00/pair
$42.95/pair
LSM205 Pair of 4-3/8" Cutting Cups for spheres from 7" to 9"
$54.00/pair
$51.95/pair
PTS381 Set of two Shaft Adapters to use 3/4" Standard Pipe Reducers
$35.00/pair
$33.00/pair

Covington Model 383 Three Headed Sphere Machine

Covington's Model 383 Three Headed Sphere Machine is easy to use. The three head system grinds faster than a standard two head configuration. It makes spheres from 2-1/2" to 10" in diameter. The Covington Three Headed Sphere Machine has the following features:

  • 1/6 HP motor
  • 3 Heads
  • Automatic Grit Application
  • Spring Loaded Heads (so constant adjustment is not needed)
  • Easy-to-Use Handles for Quick Ajustments
  • Grit Pan
  • Choice of size of 3 Cutting Cups. Please include Cup Size when ordering.
  • Instructions
  • Heavy Duty Steel Frame
Covington Three Headed Sphere Machine
Item
List Price
Our Price
Model 383 Three Headed Sphere Machine
$3025.00
$2419.00

Extra Cutting Cups for Model 383 Three Headed Sphere Machine
Item
List Price
Our Price
LSM301 Set of three 1" Cutting Cups for spheres from 1-1/4" to 2"
$33.00/three
$30.95/three
LSM302 Set of three 1-3/8" Cutting Cups for spheres from 2" to 3"
$40.50/three
$38.95/three
LSM303 Set of three 2-3/8" Cutting Cups for spheres from 3" to 5"
$49.50/three
$46.95/three
LSM304 Set of three 3-3/8" Cutting Cups for spheres from 5" to 7"
$67.50/three
$62.95/three
LSM305 Set of three 4-3/8" Cutting Cups for spheres from 7" to 9"
$81.00/three
$77.95/three
PTA383 Set of three Shaft Adapters to use 3/4" Standard Pipe Reducers
$52.50/three
$49.00/three

4" Diamond Cutting Cups (come with 3/4" National Pipe Thread)
To adapt these Diamond Cutting Cups to Covington sphere machines use the PTA383 shaft adatpters for the Model 383 sphere machine and PTS381 shaft adapters for the Model 381 sphere machine. (Listed above.)

Item
List Price
Our Price
DC4405 40/50 Grit SINTERED 4" Cutting Cups
$125.00 each
$115.00/each
DC4112 100/120 Grit SINTERED 4" Cutting Cups
$125.00 each
$115.00/each
DC4182 180/200 Grit SINTERED 4" Cutting Cups
$125.00 each
$115.00/each
DC4100 100 Grit RESIN BOND 4" Cutting Cups
$60.00/each
$55.00/each
DC4220 220 Grit RESIN BOND 4" Cutting Cups
$60.00/each
$55.00/each
DC4320 320 Grit RESIN BOND 4" Cutting Cups
$60.00/each
$55.00/each
DC4600 600 Grit RESIN BOND 4" Cutting Cups
$60.00/each
$55.00/each
DC4120 1200 Grit RESIN BOND 4" Cutting Cups
$60.00/each
$55.00/each

4-Step Grit Kit
This kit provides all the grit and polishing powder needed to produce a fine polish on most slabs and geodes.
Our kit includes one pound of each:
  • 60/90 Coarse Silicon Carbide Grit
  • 120/200 Medium-Coarse Silicon Carbide Grit
  • 400 & Finer Medium Silicon Carbide Grit
  • .75 lbs of Old Miser Prepolish Fine Silicon Carbide Grit
  • Covington Tumbler Polish
4-Step Grit Kit
Item
Price
60/90, 120/200, 400, Old Miser Prepolish, Tumbler Polish
$27.00

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