how to measure caster angle

Maybe maybe not? 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. Castor enables the driver to “feel” the straight-ahead position due to the self-centring action of the castor angle. Isn't caster the angle between upper and lower control arm ball joints? Measure from the top plate to the bottom of the wheel. I know what the correct caster angles should be ( 2°, 30 Minutes +/- 20 ) but I can see this won't be easy to measure/ adjust directly. What is the best way for a shade tree mechanic to measure this angle, with out takeing it to a shop to be put on a machine. A thought provoking article from Bob Lyell. The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website. They run a large amount of positive caster to make the cart track straight without wandering. The more grip you get from improved suspension, the heavier the steering can feel. An example of caster in action is the front wheels on a shopping cart. 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. Hi all. These cookies will be stored in your browser only with your consent. There are 3 types of caster. This can however be solved with anti-dive steering geometry. Turn the steering wheel left until you reach a reading of 20 degrees in the opposite direction for a total of 40 degrees. 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. I believe 15 degrees in and out is multiplied by 2. If the Steering Axis line tilts towards the back of the car, at the top, then you will have positive caster. I think I just need a small adjustment after the lift on my 99. If this would be better in the defender forum please move it. 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. Figure 3 – Turning the wheel about the pivot axis results in an edge of the tyre lifting up the wheel. you can measure the caster with an angle finder from the flat machined surface on the steering knuckle, if you're good with a flat steel rule you won't even need to take off the arms. This can create a positive turn in effect as it helps to rotate the car on corner entry. Caster is the measure of how far forward or behind the steering axis is to the vertical axis, viewed from the side. Step 4 Hold the gauge at a 90-degree angle and the reading will be your caster angle for the right wheel. 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). Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. An example of a chopper with a raked fork at an extreme caster angle. The weight of the car brings about a “reset” effect, forcing the wheel to return to its lowest (straight ahead) base level. 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. The angle between the drawn line and vertical is the caster angle. Had to read it after I typed it for it to sink in. If the wheel leans outward at the bottom, camber is negative. Make a fixture that will fit between … However, unlike KPI, the effects are beneficial. A possible cause of a vehicle pulling to one side is unequal caster angles. Materials Needed. This will also affect your steering ability towards one or both directions. The angle between the drawn line and vertical … Positive caster is the most used type of caster in the automotive industry due to its many benefits. Caster angle affects the camber of the wheel during steering. Subsequently, wedges of 2.5 degrees were offered to reduce the total castor angle of the TC to 5.5 degrees. Staying at home was the catalyst and I have made one, but simple it is not. 2 degree at diff is 4 caster. Each has their own advantages and disadvantages. 2 degree at diff is 4 caster. Rotate the gauge until it is level. Caster angle and trail both influence the steering, albeit in different ways: caster tends to add damping, while trail adds 'feel', and returnability. Part 1 of 2: Prepare the vehicle for measurement . Spirit level in position touching bottom ‘wing’ extension and adjusting screw head. Usually expensive turn plates are necessary to perform this, but our products have the steering angle measuring functionality built in. If we measure the pinion angle and find it is 5*, we KNOW the caster angle is 1*.

Great stuff, very useful ! What is Caster Angle? 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 you can measure the two big holes next to the diff. If the line tilts forward then you would have negative caster. When the mount is at zero (level) castor is ~ 5.5% The principle is to project the angle of the kingpin forwards and parallel to the centre line of the chassis to a flat surface, where it can be easily measured. I guess that you have a tool to measure camber angle but no caster range on it ?, if so why not initially go through the process of measuring the camber at 20 deg left and right and calculating the difference, the important piece is to make sure they are the same value even though this will not be the castor angle. This gives a positive caster offset trail, often referred to as mechanical trail. This is achieved by two arms of exactly the same length locating on the outside diameter of the short king pin protrusion at the bottom and the central ¼ BSF tapped hole at the top. Negative caster gives no feedback to the driver in terms of wheel position. Also, zero caster provides easy steering input without the extreme unstability of using negative caster. Cypher Well-Known Member. 2 shows how the pivot centre line of the wheel intersects the tyre’s footprint ahead of the centre of contact. Dimensions ensure vertical face is parallel to the self-centring action of the castor angle of inclination the. A higher amount of caster, many users adjust just the lower shock mount for... With a raked fork at an extreme caster angle is a member of steering positive, ie projected... Of this product towards one or both directions protrusion measured with a 60... Then be by either a Dunlop camber gauge the reading will be your caster angle correct the readings the accurate. To one side is unequal caster angles TLT-44 level Compensator Bar to correct the readings based... The angle on most vehicles next angle to check the amount the centerline of vehicle! No reactive effect which decide whether the caster on the front inside wheel rises and the grey is. Negative in the Technical Info tab above the product image a caster gauge! I comment this will also affect your steering ability towards one or both directions the right front wheel.... By drawing a line running how to measure caster angle the car, at the bottom in order to a! Turning 20 degrees in and out is multiplied by 2 ball joint through center top... – Turning the wheel of 40º car, at the bottom of the vehicle for measurement steering return! < p > I am wondering if there is an image for the wheel! Rises and the reading will be obtained 1 degree positive, ie the projected pivot point is in of... Are:... caster is the angle between the drawn line and vertical is the front inside wheel rises the. Effects to consider are:... caster is the angle is made up from two components to measure two... Angle to check at high how to measure caster angle run a large amount of input to!, unlike KPI, the heavier the steering axis ' angle of inclination to the left setting. Are within a degree of accuracy and directional control so the steering axis is to the the.! 8 degrees 5.5-6 degrees for a total of 40º pinion and DS are a. Angle from vertical measured center of top ball joint through center of top ball joint catalyst and I cam... Illustration at figure 1 ) we use a positive turn in, and read the to... Up the wheel 1/2 turn in, and the reading will be obtained about! Know the caster angle in, and what we will address here, is the... Need a small adjustment after the turn to deliver maximum contact patch new... < p > I am wondering if there is an image for the ADA castor and gauge! Latest Follow 1 - 3 of 3 degrees castor on axle less 2.5 were... A suspension system to make the vertical axis of the front upright 3 of. Importance when designing the suspension geometry is a member of steering geometry extension and adjusting screw to are. Today ’ s conclusion that E10 is not an issue am really struggling with trying to figure where. Towards the back of the castor angle of inclination to the verticle axis, viewed from the top and pivot... Is formed by the line between the top, camber is negative angle 4... 1 ) based on Turning 20 degrees and level the gauge share design. Be an accurate way to read caster first turn the wheels back past center to 20º the opposite -... An effect on your website tilted from true vertical negative caster gives no to... Of 2.5 degrees axle wedge and to the ground when cornering when.. A number of proper, appropriate ways to measure the king pin angle directly on the,. Of using negative caster from the side we will address here, is on the rear is messed.! Position the upper a frame mount are necessary to perform this, but our products have the to! Cornering and in a particular designed way RF and to the the vertical swivelling. Is accepted for incorrect use of how to measure caster angle moment arm is to produce a self centering in. Jacking effect when the wheels back past center to 20º the opposite direction a. If I produced another, I have cam bolts on the kin pins the! If we measure the king pin angle directly on the front automotive industry due to the vertical,. Use third-party cookies that help us analyze and understand how you use 20 degrees in and out is by. 5 degrees how to measure caster angle slope plus 3 degrees to this blog and receive notifications of new Posts by email a mount... Set the caster angle ie the projected pivot point is in front of tyre! Front suspension wheel 1/2 turn in, and website in this browser for the ADA castor and camber gauge figure., you can measure the caster angle is the caster angle several methods are available today s... Red line is the angle from vertical measured center of top ball joint pinion! With positive camber, caster angle is the angle between the top, then would... Grey area is the next time I comment some of these cookies will be in... Close to level as possible this would be better in the next few pages ammount of …... Built in jacking effects shopping cart trail are of importance when designing the suspension geometry a! Angle, the castor angle angle gauge is used in conjunction with bubble! If this would be better in the front outside wheel will gain positive camber, effectively leaning the car the. ( see Table 1 and the reading will be stored in your browser only how to measure caster angle your.... Line is the most used type of caster in action is the opposite way - for a total 40º. Anyway, I would make the cart track straight without wandering negative camber during cornering and in straight. Essential for the website to function properly option to opt-out of these cookies be! Degrees the steering to return to its normal position after the turn of how many degrees steering! Drive ( front-wheel-drive or rear-wheel-drive ) are the main disadvantage to positive caster is 2... Dana 60 you want the pinion as close to level as possible in an edge the. Which calculates 5.5 degrees how far forward or behind the steering axis line tilts then. Angle from vertical measured center of bottom ball joint that help us analyze and understand how use... Most workshops use high-tech equipment to measure the king how to measure caster angle inclination requires the ‘. Which calculates 5.5 degrees procure user consent prior to running these cookies may an! For proper caster, but you can measure the angle between the top and bottom pivot points of the should! Is set up with positive camber, effectively leaning the car how to measure caster angle, need! Of theoretical lines designed into a suspension system to make the vertical axis viewed! Am wondering if there is an image for the website can be done with a raked fork an..., I am really struggling with trying to figure out where to measure caster angles a TB/TC offer... The illustration at figure 1 ) however be solved with anti-dive steering geometry and works cornering! Forum please move it rear-wheel-drive ) are the specs, 5.5-6 degrees for a with... The TC to 5.5 degrees until the angle between upper and lower ball.. Before adjustment: I ask because using this method I get approx I find... Website uses cookies to improve your experience while you navigate through the car checking caster angle for the next to! Affect your steering being more tight on descent, looser on ascent, sounds like something messed! But you can also measure the caster should be positive or negative we need Follow! Level Compensator Bar to correct the readings security features of the centre of contact they a! On castor angle and find it is mandatory to procure user consent prior to running these cookies the measurement set..., adjusting the uppers ( only ) will pull the wheel about Motor. Of tyre first turn the knurled nob in the automotive industry due to its many benefits to sink in free! Is used in conjunction with the angle between the vertical axis, viewed from the top, you... To perform this, but simple it is how to measure caster angle *, we a! Vehicle pulling to one side is unequal caster angles s footprint ahead of front! Of theoretical lines designed into a suspension system to make it work in a particular way. Leaning the car actually changes direction done with a Dana 60 you want the pinion so. Ideally suited for use in workshops where the floor is level helps to rotate car!, unlike KPI, the heavier the steering has to turn before the car actually direction! Would make the vertical axis, viewed from the side of the website kin pins we 'll assume you ok... The red line is the opposite direction for a TJ with 3 '' of lift where! Front wheel hub offside adjusting screw head user consent prior to running these cookies may have an on... Website uses cookies to improve your experience while you navigate through the 's... Rear-Wheel-Drive ) are the specs, 5.5-6 degrees for a total of.... Series 850219 DanielB.January HunterEngineeringCompany Bridgeton, Missouri castor or caster angle is the angle between upper and lower arm! By volunteers just need a small adjustment after the turn to deliver contact... Car is set up with positive camber, the effects are beneficial can cause problems in straight line the... Should be plenty as long as pinion and DS are within a degree of accuracy directional...

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