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PRT

Overview

Not all motion needs are linear, which is where PRT (Precision Ring and Track), DTS, and commercial product lines come in. The PRT line offers rotary systems, while the DTS line offers actuated rotary systems. For customers seeking a more economical rotary system not requiring high accuracy, the commercial series offers a great alternative.

Assembled Rotary Systems

Ring systems are precision ground with hardened V faces for long life. Gear teeth may also be cut along the inner or outer diameter to provide means of actuation. Two types of rotary systems are possible - rings may be mounted and held stationary with a carriage that moves along the ring, or as a moving object supported by fixed bearing assemblies. Concentric and eccentric bearing assemblies provide smooth and easy motion. The assembled rotary system is an ideal solution for rotary table applications. The rotary table can either be non-actuated, or driven using the geared teeth cut into the ring.

Slide Rings and Segments

Slide rings and segments have hardened 70 degree V faces made from high quality steel. Rings and segments are precision ground with datum register faces - the precise machining allows for easy and accurate installation. Segments are cut from complete rings and stocked in 90 degree and 180 degree segments. Other sizes of segments are available upon request. Gear teeth are available on the inner or outer diameter. Slide rings are ideal for custom rotary tables and medical equipment.

Bearing Assemblies

Depending on configuration, bearing assemblies can be purchased as through-hole fixing type or blind hole fixing type. Through-hole fixing type bearings feature V slide bearings with long or short stud lengths. Blind hole fixing type bearing assemblies include selection of the same bearing types as does through-hole fixing type bearings, but do not require through holes. Neoprene seals are available on bearing assemblies for additional protection against small particulates and liquids.

Bearing Assembly Size Used With Ring Part Number Number of Bearing Assemblies Equally Spaced Maximum Lubricated Maximum Unlubricated
Load Capacity Load Capacity
LA (N) LR(N) M (Nm) LA (N) LR(N) M (Nm)
RSJ/BHJ-13   3 90 52 18xØc* 60 34 13xØc*
R12-93 4 113 60 22.5xØc* 75 40 16xØc*
R12-127 Each Additional 1 23 15 4.5xØc* 5 3 1.2xØc*
RSJ/BHJ-25 R25-159 3 600 350 150xØc* 230 125 55xØc*
R25-255 4 750 400 187xØc* 285 150 69xØc*
R25-351 Each Additional 1 150 100 37xØc* 18 12 5xØc*
RSJ/BHJ-34   3 1200 700 300xØc* 460 255 110xØc*
R44-468 4 1500 800 375xØc* 575 300 138xØc*
R44-612 Each Additional 1 300 200 75xØc* 38 24 27xØc*
RSJ/BHJ-54   3 2850 1650 750xØc* 1050 600 260xØc*
R76-799 4 3600 1900 875xØc* 1300 700 325xØc*
R76-1033 Each Additional 1 700 470 175xØc* 75 50 18xØc*

To calculate the life of this type of rotary system, first obtain a value for the load factor LF by entering the values for LA, LR, and M in respect to the proposed duty, into the equation below, together with the maximum load capacities from the table above.

LF= M   LA   LR
  M
(max)
+ LA
(max)
+ LR
(max)

Lubricator

Lubricators provide optimal performance of rotary systems by properly lubricating the interface between the V slide and V bearing. A grease reservoir provides continuous lubrication to prolong system life of your rotary table or any other application you may have.

Carriage Options

Two types of carriages are available, fixed center carriages and bogie carriages. Fixed center carriages are ideal for rings and segmented tracks. The fixed center carriage design follows track paths from straight to curved sections with ease. The fixed center carriage, however, will not follow “S” type bends, while the bogie carriages will follow any type of curve with smooth and easy motion. Both types of carriages are made from anodized aluminum and can be supplied fully assembled and adjusted to track segments.

Carriage Maximum Load Capacity Maximum Unlubricated Load Cpacity
Direct Loads (N) Moment Loads (Nm) Direct Loads (N) Moment Loads (Nm)
L1 L2 M MV MS L1 L2 M MV MS
FCP-12-93 120 120 1.25 1.25 0.6 80 80 0.8 0.8 0.4
FCP-12-127 120 120 1.2 1.2 0.6 80 80 0.8 0.8 0.4
BCP-12 120 120 1.7* 1.7* 0.6 80 80 1.2* 1.2* 0.4
FCP-25-159 800 800 16 16 9 300 300 6 6 3.5
FCP-25-255 800 800 15 15 9 300 300 6 6 3.5
FCP-25-351 800 800 17 17 9 300 300 7 7 3.5
BCP-25 800 800 27* 27* 9 300 300 10* 10* 3.5
FCP-44-468 1600 1600 57 57 35 600 600 22 22 14
FCP-44-612 1600 1600 65 65 35 600 600 24 24 14
BCP-44 1600 1600 75* 75* 35 600 600 28* 28* 14
FCP-76-799 3800 3800 165 165 140 1400 1400 62 62 55
FCP-76-1033 3800 3800 210 210 140 1400 1400 81 81 55
BCP-76 3800 3800 220* 220* 140 1400 1400 86* 86* 55

To calculate the life of a rotary system using a standard carriage, first obtain the load factor LF by entering the values for L1, L2, M, MV and MS in respect of the proposed duty into equation [1] below, together with the maximum load capacities from the table above.

[1] LF= M   MV   MS   L1   L2
  M
(max)
+ MV
(Max)
+ MS
(max)
+ L1
(max)
+ L2
(max)

Track Systems

Two types of track - curved segments and straight segments - can be combined in a multitude of ways to make customized rotary systems to follow any path. At joints between sections, adjustment keys allow finite positioning of slide segments to each other in order to ensure smooth transitions from one segment to the next.

Track System Straight Slides

Straight slides are made from high quality carbon steel with hardened V edges. Mounting surfaces as well as V edges are ground to provide precise and easy installation. Standard lengths are available up to 4020 mm and lengths may be butt-jointed.

Track System Curved Segments

Curved segments are created from standard 90 and 180 degree segments. Each curved segment’s ends are ground square in order to mate more easily with adjoining curved segments or straight slides.

 

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