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Post by SRC Racing on Sept 11, 2009 21:35:21 GMT -7
when using the BLOCK and of coarse strait axles,,what are you guys doing to correct rear wheels running in towards the body? the cant looks perfect on both sides, and the wheels appear to be dead strait,but when rolling the car foward wheels run in towards the body,,,i went ahead and very carefully tapped on axle head like to give some to-out,,and fixed the problem,and picked up speed, but not sure if this the correct way or only way to correct the problem,,it was all i could think of,,,now i also noticed on one car i could see to-in pretty bad so i put that one aside for now,,any of you guys run in to this?
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Post by W Racing on Sept 11, 2009 21:42:24 GMT -7
hmmm....
The rear wheels should not run into the body...
When you run the car backwards what happens?
When you cant to 2.5 negative cant and install the wheels. The wheels should look like an A frame house when viewed from the rear.
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Post by 2FAST4U on Sept 11, 2009 23:19:25 GMT -7
what kind of drill are you using? what size of bit did you use? how long do you have the drill bit sticking out of the chuck? what axles are you using? What size are the axles? Do the axles have grooves? what wheels are you using? where is the cg's or where is the weight placed? where is the rear axle height set? where is the front axle height set? you should not have to bend your rear axles... I have never had to bend my rear axles. If anything you only should have to twist the rear axles to correct the problem because most axles are not straight... My first guess is that you are letting the drill bit walk on you when drilling the axle holes... which is giving you toe-in... or you have grooved axles and when you pushed them in you bent them because you drilled too small of a hole and put too big of an axle in the drilled hole.. then bent the axle, I have seen this more than anything... in-fact La did this just the other day...  hope this helps... if you can answer the ?'s I can help you out better... Glenn |
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Post by Zeebzob on Sept 12, 2009 3:47:40 GMT -7
or you have grooved axles and when you pushed them in you bent them because you drilled too small of a hole and put too big of an axle in the drilled hole.. then bent the axle, I have seen this more than anything... in-fact La did this just the other day... I did this once...to a brand spankin' new Jewkes grooved speed axle. I pulled it out and used it on the non-dom front. Now I always put a set of axles that I don't use in the holes first then take them out and put the speed axles in. Live and learn. |
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Post by Shade Racing on Sept 12, 2009 5:01:24 GMT -7
I would think something happened when drilling, but I also have bent axles when installing
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Post by SRC Racing on Sept 12, 2009 6:24:11 GMT -7
on this particular car,,cog is 1/2" wheels are ss wheels (slick body on outside) SS wheels,,and yes the axles were extremly tight i had to run my drillbit in a few times with my pinvise,,ive bought so many axles and wheels not sure about axles but these wheels are derby works,, no grooves,,drill press is a skill i bought at lowes #3320 drill bit got from MB4hire #44 carbide (the short bit),, and i checked the squareness on drillpress with the BLOCK its square,,im sure its something i did and its probably when pushing in axles,but turning them didnt help tho. W racing ,,the cant looks as you say,,perfect on the cant. thanks Steve
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Post by W Racing on Sept 12, 2009 6:33:55 GMT -7
What about the hight of the front and rear holes?
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Post by SRC Racing on Sept 12, 2009 7:15:18 GMT -7
thats what i forgot to list,,1/8th" from the bottom of car front and back.
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Post by W Racing on Sept 12, 2009 7:23:08 GMT -7
You want straight axles on the rears or headaches everywhere...
If you look at CoalCar race you will notice its nose sticking up in the air. It is super obvious because the car is black and it has a needle nose...
The reason why is the Right Front axle hole (DFW) is drilled lower than the rears. This raises the nose up and creates toe-out.
This will prevent toe-in.. (or should)
toe-in will cause the wheel to come into the body when going forward and leave the body when going backwards (push it to the head).
toe-out has the opposite effect.
In the absence of toe-in or toe-out Negative cant will keep the wheel away from the body and positive cant will push it in regardless if the car is going forwards or backwards.
Also most PDDR racers use Positive cant on the DFW railriding wheel (recomended practice). This also creates some toe-out by raising the front end.
Not all cars have the holes drilled like CoalCar... I would call it misalligned on purpose to arrive at proper behavior. Perhaps not optimal but better than toe-in...
Is this a scout car where you are using BSA axles? If so the imperfections in the axles add a whole nother dimension...
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Post by W Racing on Sept 12, 2009 22:06:50 GMT -7
I use the same drill bit as you and you will need to cut the axles or extend the hole using a pin vice and longer bit. I cut the axles with large wire/nail cutters I purchased at Home Depot.
If you are using negative cant on the front (DFW) then that will drop the nose of the car and could lead to toe-in
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Post by SRC Racing on Sept 13, 2009 20:04:00 GMT -7
goodness no,,using a pos cant on front,,i think i figured out my problem,and you may have mentioned it,,say for example i place my rear axle holes 3/16 from bottom, i need to place my front an 1/8" from bottom,,,correct? i can see now how you can change the geometry here,,if front is too low this will create toe in,,and too high will create toe out ,,,or vise versa,,maybe i missed this one important bit of info in the past,,
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Post by W Racing on Sept 14, 2009 8:19:00 GMT -7
I have the DFW drilled less than 1/8 on CoalCar. It does effect the geometry.
However as a test....
Maybe cant all 4 holes on a test blcok at 2.5 negative and see if they move into the body. Just as a test... All holes at same height...
Are you resting "The Block" on a fence that is aligned properly?
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Post by SRC Racing on Sept 14, 2009 21:23:51 GMT -7
Thanks W racing for the advice,,just went back and read your 2nd or 3rd reply on drilling the DFW lower than the rears,,im sure this will help,, again thanks,,,steve
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