CRG Chassis and Sniper Camber / Caster adjutment

[Dai Feng]

The CRG Manuel specifies camber in mm.  Does anyone know how to translate that into the turns of the setscrew on the sniper camber/caster adjuster?

Or, if anyone knows how the mm camber spec translates to degrees camber?

From the Sniper website, it says each of the caster line is 1 degree.  So I should be able to measure that distance and apply it to the camber setting if I know the required camber in degrees.

 

Thanks in advance.

[FREDDY SANDOVAL]

Translation is very simple to achieve, all you have to do is google and type in a conversion table or calculator on how to convert MM to inches, degrees or fractions.

But if what you’re actually looking for is how to set up your kart’s camber, caster and toe, then you’re really gonna have to buy a set of snipers, you can’t just go by the lines the pills have, that won’t tell you how far you actually are off, or if the chassis is bent, you need laser beam snipes to see how far off it really is, and take measurements from there.

Yes 1 line on the pills means something, but you could count one line on one side, and another line on the other side, and still have very different negative or positive camber due to a bent spindle or yoke, or frame.

The turns on the screw don’t mean anything either, however you do wanna make sure that both sides have close to equally amount of adjustment, meaning the snipe pills are pretty much centered, and that the adjustments given from left to right at both sides of the axle do match. You can’t have the left side in the middle and the right side all maxed out.

I hope this was helpful, and if I totally misunderstood your question, please disregard this love letter.

[Dai Feng]

FREDDY SANDOVAL wrote:

Translation is very simple to achieve, all you have to do is google and type in a conversion table or calculator on how to convert MM to inches, degrees or fractions. .

Thanks for the reply, but let me clarify my question.  When one talks about camber in degrees, it is unambiguous what it means.  You measure the angle of the wheel with respect to the vertical, assume the vehicle is set on a level ground.  But when you measure it with the sniper, you read the distance the laser dot move on the opposing scale surface corresponding to the camber angle change.  That measurement is a length in mm.  But that measurement is depended on the distance between the two sniper block.  So if you change the camber angle by _a_ degrees and the distance between the snipers are _R_, then the camber change read by the sniper in mm is:

K*(2*pi*a/360)*R

for small angle (here we are just talking about a couple of degrees so no need to worry about sin or tan).

Here _K_ is 1 if the scaling on the sniper is actual mm.

Since different model of karts have different distance between the king pins and the sniper can be attached to the spindle at slight different locations, _R_ can be different.

I am getting a brand new chassis, so it better be straight.  And I will doing a bunch of testing before racing it so don’t expect it to get bend any time soon.  This is to help me get the kart setup according to the factory standard setup, without a sniper.  I plan to get a sniper later once I start racing.

 

 

[Dai Feng]

In light of the discussion in the last couple of posts,  I will ask my question differently.

For those who have a sniper, could you measure the actual distance between the reticle lines on the scale for reading camber/caster?

TIA

[William Martin]

To the best of my eyeball & calliper accuracy, it looks like 6mm. This being the old/original model Sniper unit, doubt if the grid has changed with newer units.

 

[FREDDY SANDOVAL]

Dai

I can go on and on trying to explain different angles for geometry and alignment techniques, maybe I don’t understand your question, and I apologize for that in advance.

I you’re racing or not, and you are planing to do many different set ups for testing, you should really get a sniper, otherwise take notes, adjust one line on the sniper pills, drive the kart, change it again, take notes, drive it again, etc.

If I’m not mistaken when you look at tire and it lines up straight up and down, and it’s perfectly straight, then you have +0 degrees, and if it’s tilted like an Indy car set up for temporary road course, and it measures on the snipe 2 or 3mm chances are it is about -1 to -1.5 degrees.

I could go on and on for caster and tow, and give you the definition of steering axis tilt, but you don’t have a sniper. Plus every time you’re gonna be testing and adjusting your pills to try how it performs, you’re gonna be changing your tow, unless you’re planning to set up your tow every time with a string or a measuring tape?

If I understand correctly you just wanna adjust your camber form 0 degrees to 1 or 2 negative degrees and drive it, just to see how it does, Right?

Here’s a video on how it works, I’m just trying to help buddy.

[Dai Feng]

Hi Freddy,

Thanks for helping out.  I am good now with the info from William.  That oval kart front setup is pretty cool.  I have seen the second and third videos.  I think the camber adjusting basic video is going to confuse people than helping, since it doesn’t explain when you rotate the pills, you change both the camber and caster and that it takes two pills to make independent camber adjustments.

Happy karting…

[William Martin]

Each horizontal grid line is 2mm camber per side. Don’t know why you would measure any other way than “per side” :-) since the zero reference is the ground. Must be that flat earth society thing…

 

[Dai Feng]

William Martin wrote:

To the best of my eyeball & calliper accuracy, it looks like 6mm. This being the old/original model Sniper unit, doubt if the grid has changed with newer units.

Thanks William, indeed, I doubt it would change, otherwise, people using different versions will all get confused:-)

Could you also confirm that each of the grid is referred as 1 mm of camber or chaster change?

With this info and some trig, I should be able to figure out how to set the sniper camber adjuster on my new chassis:-)

[FREDDY SANDOVAL]

No worries, buddy

Good luck and have fun.

[Dai Feng]

Yes, all my questions were for “per side”.

Also others who may be interested in knowing, I found out from Sniper that 1mm of camber means the wheel at its diameter, in this case the front wheel of 10 inch diameter, moved 1mm due to the camber adjustment.  So 1mm =   0.45 degrees, either camber or caster.

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