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Topic: Backlash (gear)

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	RRG/Learn More/Advanced Topics/Transmissions (Site not responding. Last check: 2007-10-22)
		When the two gears come into contact an impact occurs, resulting in increased wear to the gear train, and resulting in a disturbance that can affect the rest of the robotic structure.
		Backlash will also occur when the primary gear reverses direction, as the secondary gear is now wound up in the wrong direction.
		However, careful design and manufacture can reduce the effects of backlash within a transmission, and certain types of gear trains (such as epicyclic gear trains) produce significantly less backlash.
	www.robotics.utexas.edu /rrg/learn_more/high_ed/trans (684 words)

	Gear - Wikipedia, the free encyclopedia
		Different-sized gears are often used in pairs for a mechanical advantage, allowing the torque of the driving gear to produce a larger torque in the driven gear at lower speed, or a smaller torque at higher speed.
		A disadvantage of helical gears is a resultant thrust along the axis of the gear, which needs to be accommodated by appropriate thrust bearings, and a greater degree of sliding friction between the meshing teeth, often addressed with specific additives in the lubricant.
		A crown gear or contrate gear is a special form of bevel gear which has teeth at right angles to the plane of the wheel; it meshes with a straight cut spur gear or pinion on a right-angled axis to its own, or with an escapement such as found in mechanical clocks.
	en.wikipedia.org /wiki/Gear (870 words)

	Backlash (gear) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		Backlash is the amount of clearance between mated (A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion) gear teeth in a gear pair.
		Some backlash is required to allow for (An application of a lubricant to something) lubrication, manufacturing errors, (The property of being bent or deflected) deflection under load and differential expansion between the gears and the housing.
		One half of the gear is fixed to its shaft while the other half of the gear is allowed to turn on the shaft, but pre-loaded in rotation by small (A spring in the shape of a coil) coil spring s that rotate the free gear relative to the fixed gear.
	www.absoluteastronomy.com /encyclopedia/B/Ba/Backlash_(gear).htm (356 words)

	Encyclopedia: Backlash (gear) (Site not responding. Last check: 2007-10-22)
		Backlash is created when the tooth thickness of either gear is less than the tooth thickness of an ideal gear, or the zero backlash tooth thickness.
		Additional backlash is created when the operating center distance of the gear pair is less than that for two ideal gears.
		One half of the gear is fixed to its shaft while the other half of the gear is allowed to turn on the shaft, but pre_loaded in rotation by small coil springs that rotate the free gear relative to the fixed gear.
	www.nationmaster.com /encyclopedia/Backlash-(gear) (379 words)

	Backlash (gear) (Site not responding. Last check: 2007-10-22)
		Backlash is the amount of clearance between mated gear teeth in a gear pair.
		Some backlash is required to allow for lubrication, manufacturing errors, deflection under load and differential expansion between the gears and the housing.
		Standard practice is to make allowance for half the backlash in the tooth thickness of each gair.
	www.encyclopedia-1.com /b/ba/backlash__gear_.html (222 words)

	Pitch Line Runout
		Backlash is the endplay between the gear teeth as the gear sets rotate relative to one another.
		Backlash variation can be detected by measuring the backlash of the ring gear on every tooth around the gear.
		If the ring gear backlash is within specifications AND varies by more than 0.002” from the lowest to the highest backlash, then it is excessive and the differential case should be checked for excessive lateral and radial runout.
	www.vibratesoftware.com /html_help/html/Diagnosis/Reference/pitch_line_runout.htm (859 words)

	Ring & Pinion Installation Instructions (Site not responding. Last check: 2007-10-22)
		Remove the gears to be replaced and thoroughly clean both the gear carrier and housing with solvent to remove any gear/bearing residue, which could lead to abrasive failure of the new gear set.
		Backlash settings are marked on the outside diameter face or the ring gear as follows (see illustration A): Ref: BL.008, which means a backlash figure of.008 inch at the closest point.
		Pinion depth settings (or checking distance) are marked on the face of the pinion gear as follows (see illustration B): Ref: CD 2.799, which means distance of 2.799 inches from centerline of the ring gear to pinion face.
	www.richmondgear.com /01instructions.html (1549 words)

	Backlash Adjustment on Sherline Tools
		Therefore, backlash is not considered a "fault" with a machine tool but rather is simply a factor that must be kept properly adjusted and accommodated for in your use of the machine.
		Backlash on the "X" and "Y" axes of the mill may be reduced to a minimum by adjustment on the anti-backlash nuts.
		Because the mounting hole for the locking gear had to be moved slightly farther from the backlash gear to accommodate its larger size, the new system cannot be retrofitted to the old pointer style lock.
	www.sherline.com /backlash.htm (1127 words)

	How to remove backlash from worm gear systems: News from Holroyd
		Backlash is the enemy of precision in high accuracy worm gearing systems, but there is a solution, says Steve Whitehead, director of precision gear sales for Holroyd.
		In practice the gears are manufactured so that the initial backlash is achieved at a certain distance relative to a datum plane on the worm.
		When fixing the centre distance and gear data, the load capacity of the wormgear set should be such as to provide an adequate gear life with a Iow rate of wear with only very occasional need for backlash adjustment.
	www.manufacturingtalk.com /news/hoc/hoc111.html (1007 words)

	Differential Repair & Installation Instructions
		To decrease the backlash, move the carrier closer to the pinion centerline.
		Pinion depth is indicated by the position of the pattern between the face and flank of the ring gear teeth.
		Backlash must be kept within specifications, and will therefore only slightly affect the pattern between the heel and toe of the ring gear teeth.
	www.differentials.com /install.html (2228 words)

	Adjustments to remove worm gear backlash 900 GTO
		Backlash is the result of a gap between the worm and the worm wheel.
		This action moves the worm gear closer to the worm wheel, which removes the gap that you felt earlier.
		Once the backlash is gone, re-tighten the socket head cap screw and remove the fl thimble like cap on the worm housing.
	www.astro-physics.com /tech_support/mounts/900gto/900backlash.htm (975 words)

	Ring & Pinion Installation Tips - Toyota at Off-Road.com
		What follows is a group of axle gear installation notes that I have compiled that may be useful as a supplement to the assembly procedures found in the Toyota service manual.
		It is generally not good for any backlash measurement to be less than the specified setup number (etched on the side of the ring gear).
		When swapping gears, it is often a good first guess to install the new gears using the original pinion gear shims that came in the case.
	toyota.off-road.com /toyota/article/articleDetail.jsp?id=186120 (749 words)

	Toyota Gear Swap Tech
		Before installing your ring gear, it is wise to double check the gear ratio to ensure it is truly the one you expect to have.
		The center of the ring gear is also the center axis of the bearing caps, and the plane where the two bearing caps separate.
		With the pinion held steady, the ring gear is rocked back and forth, and the play between the pinion and ring gears is measured.
	www.4x4wire.com /toyota/tech/gear_setup (3570 words)

	Examination/renovation: output/balancer shaft
		The anti-backlash gear should be removed using BMW tool 12 4 600 whose protruding lugs engage in the gear holes and permit it to be rotated slightly clockwise and lifted up to disengage the spring at the same time.
		Slip a thin-bladed knife between the two gears and gradually work the two apart until a screwdriver blade or similar can be inserted to lift the gear up and disengage it from the spring; use the thick rag to prevent any risk of personal injury caused by the gear jumping off.
		Clamp the drive gear in a vice with padded jaws to avoid damaging its gear teeth and fit the spring, using a pair of circlip pliers; ensure the spring fits around the drive gear boss and that its locating pin engages in the hole provided.
	web.inter.nl.net /users/BMW-K100RT-page/manual/chapter1/examinationEngine_24.htm (1506 words)

	Integrated anti-backlash gearhead motor - Patent 5430361
		The split gear assembly is coupled to a gear of the drive shaft of a device that is to be driven by the integrated gearhead motor assembly.
		The split gear assembly 20 is coupled to a drive gear 28 of a drive shaft 27 of an output device 30 that is to be driven by the integrated gearhead motor assembly 11 or drive system 10.
		By controlling the torque provided by each of the two motors 12, 14, the split gear assembly 20 removes the backlash produced by the gearhead assemblies 13, 15 and interfaces between gears 21, 22 and the drive gear 29 and drive shaft 27 of the device 30 that is to be driven.
	www.freepatentsonline.com /5430361.html (3661 words)

	SEW-EURODRIVE Products: Servo Gear Units
		The bevel gear output stage and helical gearing of the input gear stage are quiet and have low backlash.
		The EPH motor adaptor for planetary servo gear units and EBH motor adaptor for helical-bevel gear units may be used to connect all commercial servomotors in a simple and time-efficient manner to the servo gear units from SEW-EURODRIVE.
		Optional for planetary servo gear units The circumferential backlash of these gear units is reduced even further than that of the reduced backlash version and therefore facilitate even greater accuracy when performing positioning tasks.
	www.sew-eurodrive.com.au /produkt/B11.htm (583 words)

	Mopar Rear End Gears Set Up - Ring Preload - Mopar Muscle Magazine
		Backlash is the play between the ring and pinion--the slop felt when the ring gear is rocked back and forth with the pinion held so it's not moveable.
		Measuring backlash is simple: Rig a dial indicator against one of the teeth in the ring gear, and rock the ring to see how much free-play is recorded.
		As stated, setting up gears without the special tools for measuring pinion depth generally requires a full assembly and then a check of the gear-mesh pattern to determine if the pinion depth is correct.
	www.moparmusclemagazine.com /howto/155_0308_mopar_rear_end_gears_set_up/preload.html (1328 words)

	Modeling & Analysis of a Printing Line Coating Section
		The purpose of the modeling and investigation was to observe the effect of backlash on the observed registration error in the coater, with the existing control scheme.
		This indicates that backlash will be a significant problem in terms of tuning the speed regulator for tracking a speed reference, however, a hidden benefit is that the surface speed of the blanket roll will not deviate as much as the impression roll, given the same magnitude of a given load disturbance.
		To alleviate this as a possible source of contention between the desire to regulate good surface speed, and compensate for gear backlash, the mechanical configuration should be looked at, with the aim in mind of removing backlash from the drive-trains.
	www.apicsllc.com /apics/Sr_14/Sr_14.htm (1102 words)

	Andrews Products - CAM GEAR NOISE (EV 80 and SHOVEL 74 & 80)
		If more than.002 inches (.005mm) backlash is present between the cam and pinion gear, the directional change of force will result in an audible "click" as the backlash moves from the back side of each gear tooth to the front side.
		While some positive backlash is necessary to prevent localized gear tooth overloads, excess backlash (and "clicking") may sound annoying but won't hurt anything.
		By choosing two gears which are compatible sizes for a given engine, gear backlash can be minimized so that gears will not whine or click but just run quietly.
	www.andrews-products.com /motorcycle/cams/cam_gear_noise.htm (535 words)

	Backlash and Linear Compensation
		In most cases, Backlash and/or Linear compensation are enabled or disabled by a single bit of the Robot Option Word, and consequently both are either on or off.
		Backlash compensation is added to all MOTOR commands and is in units of motor (encoder) counts, not joint angles.
		backlash = (backlash in mm) * (encoder counts/mm)
	www.adept.com /Main/KE/Data/Robot/DeviceModules/backlash.htm (2358 words)

	8.8 Axle Gear Install
		It uses a combination of frictions and steels; the steels spline to the O.D. of the side gears (the I.D. is splined to accept the axles), and the frictions keyed to the differential case (driven by the ring gear) with tangs.
		Install one of the pinion gears in place, and, while holding inward with one thumb, install the opposite side pinion gear 180 degrees apart (I prep the pinion gears first by putting a couple drops of gear oil between the gear and it's steel bearing "shell").
		The ring gear is designed and machined to produce a slight interference between the I.D. of the ring and the differential case.
	www.corral.net /tech/drivetrain/gears.html (5944 words)

	Happy Rear Ends
		Look at the carrier and the new ring gear for any burrs that won't let the ring gear seat flat on the carrier and file them off if there are any.
		Slide a NEW crush sleeve onto the pinion gear shaft and slide the pinion in the housing.
		Put some gear marking compound or white grease on the ring gear and rotate the pinion smoothly in the proper direction (so that the car would be going forward).
	www.2quicknovas.com /happyrearends.html (2345 words)

	Ring and pinion backlash
		To measure ring and pinion backlash, position a dial indicator stem on one of the ring gear teeth.
		Backlash adjustment can be made by adjusting nuts or by moving shims from one side to the other.
		The important thing to keep in mind with used gears is that the pattern should be closer to the toe than the heel of the tooth, as shown in figure 5-21.
	www.tpub.com /basae/129.htm (463 words)

	IMPORTANT:
		All Motive Gear and Motive Gear Performance ring gear and pinions have been "Lapped" in sets and should never be mixed with another ring gear or pinion.
		Each Motive Gear and Motive Gear Performance ring gear and pinion is pre-run and marked on the pinion face with its proper depth setting called the "Checking Distance." This dimension is from the face of the pinion to the axle centerline.
		Motive Gear and Motive Gear Performance ring gear and pinions are developed to be run at.008" to.012" backlash for street gear sets.
	www.motivegear.com /tech_info/R_P_instructions.html (937 words)

	SSOTN - Gear Install
		This means that the drive gear (pinion gear) must rotate 3.27 times for the driven gear (ring gear) to rotate once.
		Backlash- Backlash is the amount of play between the pinion gear and the ring gear.
		Since your factory gears were installed using the MHD method from the factory, you know that your pinion depth was properly setup with the correct pinion shim.
	www.superstallions.com /tech/drive/gears/gears.html (2992 words)

	Backlash vs. lost motion - 8/5/2002 - Design News (Site not responding. Last check: 2007-10-22)
		In particular, backlash and lost motion are often erroneously believed to be synonymous in describing the relative motion of the gearhead output position in relation to the input movement.
		Backlash, which is sometimes termed slop, lash, free-play, or simply play, is an angular quantity due to the gear's circular geometry.
		Backlash, or lost motion, is not an issue in the case of continuous single direction motion.
	www.designnews.com /article/CA234385.html (1931 words)

	Astro-Physics 600EGTO - Adjustments to Remove Worm Gear Backlash
		The remaining gears in the mount are on the motor mount plate.
		Once the backlash is gone, re-tighten the screw and try a manual slew at 1200x for about 5 minutes of run-time at the sidereal rate.
		If the previous backlash adjustments are made according to the instructions, no change to the spur gear adjustment should occur.
	www.astro-physics.com /tech_support/mounts/600gto/600ebacklash.htm (829 words)

	10-Bolt Rearend Gear Installation - Tech Article - Chevy High Performance Magazine
		Backlash is adjusted by changing the shim thickness side for side.
		Backlash is the amount of clearance between the ring-and-pinion teeth.
		Pinion depth is determined according to the thickness of the pinion shim installed between the pinion gear and the bearing.
	www.chevyhiperformance.com /techarticles/148_0207_10_bolt_rearend_gear_install (975 words)

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