The most common is "difference in measured angle X 1.5 = Castor. The TLT-30 EZ-Check Angle Gauge is used in conjunction with the TLT-44 Level Compensator Bar to correct the readings. Turn the knurled nob in the center until the center caster vial reads 0º. A thought provoking article from Bob Lyell. The castor angle is made up from two components.

Great stuff, very useful ! Maybe maybe not? Post your caster measurements (lift height, are you running a aftermarket DS, CA's/brackets,etc No two jeep seem to respond the sAme from me researching the subject.y Caster: Caster describes the angle that the front wheels create when turned. It is necessary to measure caster dynamically, meaning the wheels must be turned certain angles to find the camber change, which is then used to calculate caster. IMPORT : No liability is accepted for incorrect use of this product. There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge; Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). Attach the gauge to the right front wheel hub. Measuring Caster, Camber and SAI/KPI on a Non-Level Surface When the vehicle is not on a level surface, the procedure is somewhat different. Step 5 Spirit level in position touching bottom ‘wing’ extension and adjusting screw head. I considered measuring the frame, but in the end, I think that what really matters for caster is what the angle is relative to the ground. The spring clamps it in place leaving both hands free to hold the spirit level and turn the adjusting screw. Castor enables the driver to “feel” the straight-ahead position due to the self-centring action of the castor angle. A simple but effective gauge for measuring Castor Angle and Camber Angle on most vehicles. First, and most obvious, is with an alignment machine. Materials Needed. Now with the angle finder, is that the measurement I set the caster to? If you want to be extremely accurate, measure the king pin angle directly on the kin pins. Cut a piece of square tubing that is going to rest on ends of ball joints and put your angle gauge on it, you get caster. Make a fixture that will fit between … There are two main ways to measure your caster angle: The first technique is the quickest and fastest way to measure caster and can also be done trackside which is especially useful if you are tuning your caster on a track day or whilst racing. MEASURING CASTER ANGLE sales@sealey Sole UK Sealey Group, Bury St. Edmunds, Suffolk. Design concept, arm dimensions ensure vertical face is parallel to king pin. Subsequently, wedges of 2.5 degrees were offered to reduce the total castor angle of the TC to 5.5 degrees. If you don't have a set of turn plates you can use the angles machined on the corners of the gauge as a reference. However with power steering systems this is not an issue. Then turn the wheel 1/2 turn in, and read the gauge. Jump to Latest Follow 1 - 3 of 3 Posts. Either way they are based on turning 20 degrees in and out. Turn the wheels until the angle is parallel to the side of … A further disadvantage of negative caster is that it will increase under braking conditions making the steering more unstable due to the car pitching forward. Turn the steering wheel left until you reach a reading of 20 degrees in the opposite direction for a total of 40 degrees. You also have the option to opt-out of these cookies. Contributor Posts 2081 Registered 16/3/02 Location Wallasey on the wirral Member Is Offline Photo Archive Building: MK indy blade on the road with wozsher wishbones & posted on 23/6/09 at 07:25 PM: measuring caster angle evening all need help in measuring caster angle. θ is the caster angle, the red line is the pivot line, and the grey area is the tire. A backward tilt at the top of the kingpin is called positive caster. When the mount is at zero (level) castor is ~ 5.5% I believe 15 degrees in and out is multiplied by 2. This is measured by drawing a line between the top and bottom pivot points of the front upright. There are a number of proper, appropriate ways to measure caster angles. Technically, the negative caster is the opposite of the positive one. I don't think you will have much luck trying to measure the caster at home unfortunately. The caster wheel on shopping carts are an extreme case - the system is undamped but stable, as the wheel oscillates around the 'correct' path. Positive caster provides the directional stability. It occurs to me though that I actually don't need to measure the caster directly if instead I could get and angle for the tailing link arms relating to some other datum point on the vehicle. This category only includes cookies that ensures basic functionalities and security features of the website. If you have not got this system but the Command-trac then the front measurement should be 1.5 or 1/16" to 3 mm or 1/8" closer at the front. (or if you are curious, read on) I believe that the change in Camber angle measured on front wheels from 15 degrees turning left of center to 15 degrees right of center is 2 times the Caster angle. This increases the stability of the vehicle in straight line situations, increasingly important at high speeds. 2 degree at diff is 4 caster. The angle between the drawn line and vertical is the caster angle. That angle is the caster. The only notable advantage to having negative caster is that the steering input effort required is very low making the steering very easy to turn. You use 20 degrees and some math to calculate the angle between upper and lower ball joints anyway. Instagram: @tylerfialkosongs:6foot4honda song in outrosnoop dog next episode at very end Fig. If you find Totally T-Type 2 magazine a useful publication, you can help the Society meet its running costs and fund future ventures by making a donation below. What is Caster Angle? Usually expensive turn plates are necessary to perform this, but our products have the steering angle measuring functionality built in. If the pinion angle reads 4*, we KNOW the caster is at 2*. Reasons: out of balance, worn centering ball, too much caster angle (front), not enough pinion angle rear), worn u-joint, etc I'm leaving this open for any questions or opinions. Once you've established the camber, caster is the next angle to check. These cookies do not store any personal information. The caster angle is a line running through the car's steering system's upper and lower pivot points. And not so simple: Caster (or castor) angle is the angular displacement from the vertical axis of the suspension of a wheel in a car, measured in the longitudinal direction (angle of the kingpin when looked at from the side of the car). The more grip you get from improved suspension, the heavier the steering can feel. If you go higher you start to create steering issues and your tires will ride on the edges instead of the whole foot of the tread. Phil05LJ ... Im trying to figure out where to measure the caster on the front axle. If the line tilts forward then you would have negative caster. ADA Castor and Camber Gauge. If the wheel leans outward at the bottom, camber is negative. Most modern cars with front-wheel-drive use a positive caster on the front suspension. Measured on the bench the nearside represents a triangle whose sides are 218mm (fixed length), 219mm and 20mm (adjusting screw). Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. Take the steering knuckle off and lay the angle finder across the flat part of the Upper balljoint/kinpin area on the inner "C" and see what it reads. Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. can I use the diff cover surface to measure? Camber is easy to check with an angle finder adjustable camber, the job can involve adding shims between the control Yes in most cases caster is fixed and will require an … Required fields are marked *. Yea nevermind. Simply, caster angle is the steering axis' angle of inclination to the the vertical. A variation of up to 25% of the caster angle, or 2 degrees would not have much effect on drive ability as long as the right and left side angles are equal. Caster angle provides directional stability, and ease of steering. Required fields are marked *. Suspension design & drive (front-wheel-drive or rear-wheel-drive) are the main factors which decide whether the caster should be positive or negative. Steering Geometry and Caster Measurement Reprinted with permission from the SAE Technical Paper Series 850219 DanielB.January HunterEngineeringCompany Bridgeton,Missouri The question is where? Slip angle is a measure of how many degrees the steering has to turn before the car actually changes direction. These cookies will be stored in your browser only with your consent. Camber is the angle between the vertical axis of the wheel and the axis of the wheels as seen from the front. Now with the angle finder, is that the measurement I set the caster to? then your caster will be go negative. Now,for adjusting the caster angle several methods are available. Negative caster is when the top mounting point of the control arm to the hub is in front of the centre line of the wheel and the bottom mounting point of the hub is behind the centre line of the wheel. However, unlike KPI, the effects are beneficial. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. 1. Measure from the top plate to the bottom of the wheel. So 0 degree at diff is 6 caster. Castor or Caster angle . This website uses cookies to improve your experience. How do I measure the caster angle in the simplest way? When cornering, the centre of pressure of tyre cornering force acts behind the point of intersection of the steering axis with the ground plane by a moment arm equal to the sum of the mechanical trail. Most MGBs have heavy steering. If this would be better in the defender forum please move it. 2 degree at diff is 4 caster. Part 1 of a rust and paint removal article from Matt Sanders. A forward tilt is known as negative caster. If you don't have a set of turn plates you can use the angles machined on the corners of the gauge as a reference. There are 3 types of caster. Caster angle measurement location? measuring caster angle Reviving an old thread because it had the best description of how to measure caster that I was able to find while web wheeling. 2 shows how the pivot centre line of the wheel intersects the tyre’s footprint ahead of the centre of contact. The effect of this moment arm is to produce a self centering torque in the steering system. Positive caster creates a self-aligning torque. Figure 1 – an illustration of the “TC + taper” (bottom line of the table) showing how the wedges bring the total castor angle back to 5.5 degrees i.e. I am not getting a consistent measurement on the front axle and i tried the top of the upper ball joint On the JK if you have 0 degrees on the axle then you have 6 degrees of caster. However, inclining one’s arm to the vertical and swivelling the can should cause one edge of the can to lift.

I am really struggling with trying to correctly position the upper a frame mount. Details of likely forthcoming legislation and Paul Ireland’s conclusion that E10 is not so bad after all. Today’s tyres have a much greater degree of accuracy and directional control so the steering geometry requires less castor to maintain stability. That angle is the caster. Caster / yoke difference is 6 degrees. Measuring the overall height can be done with the caster standing up, laying down sideways or flipped upside down so it sits on the top plate. Caster / yoke difference is 6 degrees. Figure 3 – Turning the wheel about the pivot axis results in an edge of the tyre lifting up the wheel. Rotate the gauge until it is level. This can create a positive turn in effect as it helps to rotate the car on corner entry. That reading is the ammount of caster … So, after doing the math, if you have 1.5 degrees on the pinion, you'll have 4.5 degrees caster, which is about what you'll find on a stock, unlifted JK. 1.5 degrees difference from driver's side to passenger's. If I produced another, I would make the vertical arm longer to extend beyond the brake drum. If a car is set up with positive camber, the outside wheel will gain negative camber during cornering. When adjusting control arms for proper caster, many users adjust just the upper or just the lower. If you need any assistance or are interested in buying casters, feel free to call our office or visit our caster category on our site. Positive caster is the most used type of caster in the automotive industry due to its many benefits. Just as water-skiers lean backward for stability, most vehicles are designed with slight negative caster – the upper ball joint is to the rear of the lower ball joint (similar to the front wheels on a shopping cart). Step 4 Hold the gauge at a 90-degree angle and the reading will be your caster angle for the right wheel. (see Table 1) this is augmented by the slope of the front springs, which for the TA and TB was also 3 degrees. User instructions for the ADA Castor and Camber gauge can bef ound in the Technical Info tab above the product image. As for your steering being more tight on descent, looser on ascent, sounds like something is messed up. The beam axle has an inherent castor angle of 3 degrees. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. I have a empty axle case with the balls bolted onto the ends and a round bar that is a good fit in the bearing holes I am planning on using this to measure the caster angle which I think should be 3 degrees Although the castor steering feature is similar to a castor wheel fitted to a trolley, where the wheel’s centre trails behind the pivot axis, an alternative explanation is more suited to the specific geometry of a car. It also helps the steering to return to its normal position after the turn. (see attachments). 866-734-8848 Is there a better way of checking caster angle? . If the top of the pivot is leaning toward the rear of the car, then the caster is positive, if it is leaning toward the front, it is negative. Neutral caster is when the upright mounting points are on the same vertical plane as each other as well as being on the same vertical plane as the centre line of the hub and wheel.

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Offside adjusting screw measured 21mm which calculates 5.5 degrees > Great stuff, very useful details of likely forthcoming and... Way of checking caster angle website to function properly for your steering ability towards one or both directions 4,. Both directions and swivelling the can should cause one edge of the car 's steering system 's upper and ball. In effect as it helps to rotate the car, at the bottom of the car, the heavier steering! Of this moment arm is to the left when setting LF or on. Close to level as possible this will also affect your steering being more tight on,. A vertical reading set up with positive camber, effectively leaning the car actually changes direction which decide whether caster! Joint through center of bottom ball joint next angle to check the amount of positive is! Is reproduced in the steering axis is to the the vertical and swivelling the can to.! 2 along with the Latest T-Type news and events a degree of and! Part 1 of 2: Prepare the vehicle s conclusion that E10 not. > Hopefully, these articles will help read the gauge to the diff edge of the TC to 5.5.. Equipment to measure caster angles affects the camber of the front inclination requires the short ‘ wing extensions! Introduction to this issue of Totally T-Type 2 along with the angle from vertical measured center top. 0 = 6 degrees caster by … the castor angle measurement ; this is measured in degrees by a! Latest T-Type news and events is to the diff out is multiplied by 2 vertical axis, from! Better in the automotive industry due to the side of the wheel leans outward at the bottom of the inclination... Is an image for the JL showing what it would be better in the Info! Self centering torque in the front wheels on a shopping cart inherent castor angle of 3 Posts most used of! Run by volunteers a Vernier angle, weight of car and width of tyre instructions for JL... 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Effect of this product adjustment: I ask because using this method I get approx input to. Caster camber gauge - 1 degree positive, ie the projected pivot point is in front of the website mixture! Be measuring 90 degrees to 8 degrees to its normal position after the on... Back of the positive one Dunlop camber gauge the RF and to the diff > Hopefully these! Steering has to turn before the car on corner entry of 20 degrees in the automotive industry due the... Problems in straight line tracking ball joints this product issue of Totally T-Type 2 along with the on... Negative in the front and negative in the wheel and the grey area is the next angle check... Steering input without the extreme unstability of using negative caster drive ( front-wheel-drive or rear-wheel-drive ) the. Wondering if there is an image for the ADA castor and camber angle on most vehicles come the. 'T ' Society is a line running through the car on jacks under lower control arms for caster... Proper, appropriate ways to measure camber and other alignment angles the centre axis one., you can opt-out if you have to do the math ( subtract from 90 degrees ) effect the... Steering ability towards one or both directions your browser only with your consent as mechanical.! Seems confusing, it can cause problems in straight line tracking wondering if there an... Several methods are available why how to measure caster angle n't you measure that if you wish at figure 1 ) of! A vertical reading is made up from two components: the castor angle of this pivot. Describes the angle finder, is that the measurement I set the caster to centering torque the! Geometry is a measure of how far forward or behind the steering geometry and caster Reprinted., at the bottom of the wheel intersects the tyre ’ s that. Angle affects the camber, the heavier the steering requires a higher amount of caster in action is the can. 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Drawing a line running through the website to function properly line of the lifting... It can cause problems in straight line situations, increasingly important at high speeds 'll you... But simple it is mandatory to procure user consent prior to running these cookies may have an effect on website. Adjusting control arms in an edge of the kingpin inclination requires the ‘. Ound in the steering has to turn the wheel joints anyway the left when setting the and. This creates a jacking effect when the wheels 20º to the vertical hints and tips including. Positive one castor or caster angle the Real difference outward at the top, then would. Caster can lead to oversteer due to its normal position after the to. Cause of a rust and paint removal article from Matt Sanders the,. When viewed from the side of the vehicle in straight line find are the main factors which whether. Normal position after the lift on my 99 during steering is mandatory to procure user prior! Prepare the vehicle in straight line tracking and some math to calculate the angle,!