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
			L_A (N)	L_R(N)	M (Nm)	L_A (N)	L_R(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		L_A		L_R
	M (max)	+	L_A (max)	+	L_R (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	M_V	M_S	L₁	L₂	M	M_V	M_S
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		M_V		M_S		L₁		L₂
	M (max)	+	M_V (Max)	+	M_S (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.