PR-1 and PR-2 Lapping and Polishing Machines

Looking for a simple, reliable machine that can get the job done? Choose our PR-1 which has been meeting the most demanding specifications for more than 75 years.

The PR-1 is our most popular lapping machine, with more than 2,200 having been built thus far, and with good reason. The four different carrier configurations (32T, 50T, 66T & 85T) allow you to lap or polish a variety of parts, and the simplified two-way motion provides a quality machine with extremely low total cost of ownership values.

The model number refers to the number of teeth on the different sizes of the carriers (work holders). The carrier size is chosen based on the size of the part being processed; the smaller and thinner the part, the smaller the carrier. The basic machine is the same for all models with the ring gear, center gear, drive components, and plates being changed to accommodate the size and number of carriers. On the PR-1, a work surface and cabinet to the right of the plates provides room for the operator to arrange the pieces to be finished.

Model PR-1 is ideal for research and development applications where small quantities of parts are common. The pieces to be processed are placed in carriers (workholders) which are driven in a planetary motion between two stationary plates. The planetary action simultaneously removes equal amounts of material from both sides of the pieces.

For thin and fragile applications, there's also an optional top plate drive version that converts your PR-1 into a 3-way lapping machine.

With PR-1 lapping/polishing machines you also get:

  • Soft-start variable speed DC drive, ensuring our polisher machines will handle your parts gently and safely
  • Fixed bottom lap plate: you get a lapping machine with a zero-runout base
  • Equal removal rates from top and bottom of parts
  • Standard stationary top plate for high aspect ratio parts

General Description

Configuration: 32T 50T 66T 85T
No. of Carriers 13 8 5 5
Part Circle: 2.1" [53mm] 3.6" [91mm] 5" [127mm] 6.6" [168mm]
Root Dia: 2.5" [64mm] 4" [102mm] 5.3" [135mm] 6.9" [175mm]
Plate Dimensions: 32T 50T 66T 85T
OD: 14.4" [366mm] 14.3" [363mm] 14.3" [363mm] 19.1" [485mm]
ID: 11" [279mm] 9.4" [239mm] 6.8" [173mm] 6.8" [173mm]
Track: 1.7" [43mm] 2.45" [62mm] 3.75" [95mm] 6.15" [156mm]
Top Plate Weight: 32T 50T 66T 85T
5/8" (15mm): 19 Lbs [8Kg] 24 Lbs [11Kg] 28 Lbs [13Kg] 45 Lbs [20Kg]
3/4" (19mm): 21 Lbs [9Kg] 26 Lbs [12Kg] 32 Lbs [15Kg] 52 Lbs [24Kg]
1-1/8" (28mm): 27 Lbs [12Kg] 36 Lbs [16Kg] 44 Lbs [36Kg] 80 Lbs [36Kg]
Weight (approx):
85T: 1,150 Lbs [520Kg] (Shipping 1,250/570)
66T, 50T & 32T: 880 Lbs [400Kg] (Shipping 1,000/450)
Standard Electrical Supply:

208/220/230 VAC, 50 or 60Hz, 1 Phase, 15 Amps

115 VAC Optional on all models except 85T

The PR-2 Is Perfect for Very Small Parts

Our PR-2 polisher machines are also available for those very small, thin and fragile parts. The PR-2 is small enough for tabletop use, but built with the same rugged construction as the PR-1.

It is ideal for research and development applications where small quantities of parts are common. The pieces to be processed are placed in carriers (workholders) which are driven in a planetary motion between two stationary plates. The planetary action simultaneously removes equal amounts of material from both sides of the pieces. The PR-2 Series planetary lapping and polishing machine can be modified to meet your processing requirements by the addition of a wide variety of optional accessories.

General Description

Machine Weight:
  • Basic Machine: 96 pounds (44 Kg)(approx)
  • Shipping Weight: 175 pounds (80 Kg)(approx)
Machine Dimensions:
  • Diameter: 12" [31cm]
  • Height: 16" [41cm]
Plate Dimensions:
  • OD: 6.9" [175mm]
  • ID: 3.5" [90mm]
  • Track: 1.7" [43mm]
  • Top Plate Thickness: 0.375" [9.5mm]
  • Top Plate Weight: 3.5 pounds (1.6Kg)
Carriers:
  • Number: (5) 32 Tooth
  • Part Circle: 2.1" [53mm]
Minimum Work Thickness: 0.003" [.076mm]
Standard Electrical Utility: Drive Motor: 1/17 HP (0.04KW) DC
115 VAC, 60 Hz, Single Phase, Std 15 Amp Wall Outlet.
220 VAC, 50/60 Hz, Single Phase, Std 15 Amp Wall Outlet.