LINEAR MOTION CONTROL PRODUCTS User Manual Precision Roller Pinion System Linear Rack and Pinion Systems 1 FORM NO. L-21235-G-0413 FORM NO.
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this manual are subject to change without notice. Technical data listed in this manual are based on the latest information available at the time of printing and are also subject to change without notice. Technical Support: 800-843-7445 (651) 484-5900 www.nexengroup.com DANGER Read this manual carefully before installation and operation.
Table of Contents General Safety Precautions ---------------------------------------------------------------------------------------------------- 4 System Design Overview ------------------------------------------------------------------------------------------------------- 5 General System Requirements ------------------------------------------------------------------------------------------ 5 Rack Requirements-------------------------------------------------------------------------------------
GENERAL SAFETY PRECAUTIONS DANGER WARNING Use appropriate guarding for rotating components. Failure to guard could result in serious bodily injury. This product has moving parts that can crush or cut appendages. Provide adequate spacing or guarding from any operating product. WARNING WARNING Failure to properly support the load before disengaging the RPS system could cause serious harm to operators or equipment. Ensure proper guarding of the product is used.
SYSTEM DESIGN OVERVIEW The machine design guidelines, installation procedures, specifications, and tolerances, listed in this document are designed to obtain Nexen’s published RPS performance ratings with reasonable effort. In some cases some of these requirements can be deviated from with a reduction in the R PS system performance. Contact Nexen to determine if the desired deviation is possible and its effect on system performance.
• RPS systems are surface treated with various products depending on the model. All standard pinion product offerings include uncoated, bearing grade steel rollers. Pinion roller corrosion will lead to pinion needle bearing damage and then system failure. Always protect the pinion from adverse conditions.
GENERAL DESIGN GUIDELINES The following requirements must be met to ensure proper RPS operation: A a) Mount a linear guide rail on a surface parallel to the RPS rack mounting surface with the same flatness as the rack mounting surface ash shown in Figure 2. b) The pinion shaft must be parallel (0.03 mm [0.001 in]) to the rack mounting surface opposite the rack teeth and the angle between the pinion shaft and the face of the rack must be 90° ±0.1° maximum as shown in Figure 1). // 0.03 mm A 0.
RACK INSTALLATION 1. Ensure that the mounting surface and rack are completely clean, free of burrs, or anything that could interfere with full contact with the mounting surfaces. 6. Once the rack mounting bolts are fully torqued, verify tooth peak variance is less than ±0.03 mm [±0.001 in] by placing a dial indicator on the movable carriage with the indicator tip on the tooth peaks. Measure the tooth peak variance at points throughout the rack section as shown in Figure 6. 2.
alternately pushing down on opposite ends of the tool. If not using the bolt down method, skip to Step 12. Alignment Tool 9. Fasten the Alignment Tool to the mounting surface using customer supplied fasteners while making sure the face of the alignment tool is fully seated against the rack face and tighten to the initial torque value in Table 1. 10. Tighten the second rack’s bolts to 10% of the torque values in Table 2. Part # 11. Torque the alignment tool to the final torque specified in Table 1.
Rack width B Through Hole Mounting of Alignment Tool GEN A A C E Through Hole G Tapped Hole Alignment Tool Rack Segment D E Rack Mounting Reference Surface A Alignment Tool Rack Segment I Rack Mounting Through Hole (See Table 2) Second Rack Tapped Hole Mounting of Alignment Tool GEN A H Alignment Tool Mounting Bolt J Rack Mounting Bolt First Rack Clearance 0.1 - 0.
ROLLER PINION INSTALLATION Note: There are two pinion mounting styles, shaft or flange mount. Refer to the following section that applies to your situation. In either case it is critical to minimize radial variance. It will effect pinion preload and positional accuracy throughout the run. 4 Tightening Order 1 Coupling bolts Inner Coupling Half Outer Coupling Half 3 Shaft Mounted Pinion Installation NOTES: 2 • Refer to product drawings for shaft details.
10. Once the fasteners are fully torqued verify the pinion is centered on the rack. If not, measure the positional error and then remove the pinion as described in the DISENGAGING THE ROLLER PINION section. Repeat the pinion installation procedure and offset the pinion by the recorded error plus the previous off set value. When the pinion is fully torqued and properly centered on the rack then verify pinion concentricity at the center of the pinion rollers as shown in Figure 11.
. Clean the pinion flange and pilot where it will contact the adapter (if used) or gearhead flange inspecting for contaminates, burs, or surface defects that would interfere with full contact between the pinion and adapter (if used) or gearhead flange. 14. Apply a serviceable thread locking compound to the pinion mounting screws and assemble the pinion to the adapter (if used) or gearhead, leaving the mounting screws snug but do not tighten at this time. Figure 16 15.
18. Repeat concentric runout inspection Step 15 and verify concentric runout remains within specifications after fully torquing the pinion. If the runout is out of specifications the pinion should be removed inspecting for contaminates, burs, or surface defects that would interfere with full contact between the pinion and adapter (if used) or gearhead flange. Indexing the pinion relative to the adapter (if used) or gearhead may help in some cases.
3. Verify pinion rotational axis is as close to 90° from the rack run axis, the pinion rotational axis is also parallel with the tooth tops or rack mounting surface, and the rack is centered between the pinion bearing flanges as shown in Figure 1. 7. With the pinion preloaded to specifications manually traverse the carriage down the run by hand (if possible) checking for smoothness and uniformity of resistance.
RPS SYSTEM OPERATION TABLE 7 DANGER RPS Maximum Speeds* This product has moving parts that can crush or cut appendages. Provide adequate spacing or guarding from any operating product. WARNING Ensure proper guarding of the product is used. Nexen recommends the machine builder design guarding in compliance with OSHA 29 CFR 1910 “Occupational Safety and Health Hazards”. WARNING Use appropriate guarding for rotating components. Failure to guard could result in serious bodily injury.
LUBRICATION 2. Using a swab apply a very small dab of grease on the middle of each tooth face and roll the pinion back and forth over the entire length of the run 5 times. The pinion needle bearings are sealed and lubricated for life and cannot be serviced.
WARRANTY Warranties Nexen warrants that the Products will (a) be free from any defects in material or workmanship for a period of 12 months from the date of shipment, and (b) will meet and perform in accordance with the specifications in any engineering drawing specifically for the Product that is in Nexen’s current product catalogue, or that is accessible at the Nexen website, or that is attached to this Quotation and that specifically refers to this Quotation by its number, subject in all cases to any lim
