Roog
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- #121
Do you grind your own lathe tools? We had a few face groovers we made from HSS blanks.
Yes I do, I am thinking about putting a shallow grove in the tire to align with the clincher rim.
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Do you grind your own lathe tools? We had a few face groovers we made from HSS blanks.
Blimey, mate! Record first run out. Yeah, I's say that makes for a successful first session. Good show.
Always mods to make chasing that elusive mph figure. Looking forward to your follow-on runs.
Curious? Can you use the present body as a mold to pull one in Lexan? Reads like the gorilla in the room is body weight.
Good call re scuffing them surfaces. Lucky I have a couple of spare tires3m contact adhesive should work for glue I would think. I would scuff the rubber and aluminum up with sandpaper for it to get a good bite.
Do you have any other rubber you could try making tires out of? It looks like the conveyor belt you are using has internal cording. I'm thinking that might be the cause of the ovaling. The cording is directional in the belting I've dealt with.
Thanks @Doom! they certainly look much neater than the fresh sawn wheels, I can see now that I was a bit complacent thinking that wearing them in on the track would be OK.Looks good! Will compressed air clean up the mess or make it worse? Sticky stuff can be a pain.
Interesting and disappointing experience at the track today, with my bonded tires my car didn’t improve on its previous runs, there was a burning smell and vibration which brought the run to an end. Two of my tires held together absolutely fine, however one tried to escape its wheel/hub causing the uneven shape in the picture. Oh dear!
View attachment 187710
The glue remains well and truly bonded to the tire.
A bit despondent a club member offered me two ‘proper’ tires, I’ll have to replace them, this could be expensive.
View attachment 187711
I’m not sure how they are made, but they are quite solid, I think something has been moulded in its core.
So now I have to make some new hubs and probably a new drive shaft because the new tires are wider at the centre.
I’m finding this going around in circles really hard!
Speed racing is tough. Esp. tethered racing. Obviously placing loads on the car and chassis none of us 'straight liners' have experienced. Hard to make any recommendations.
Speed racing improvements, though, is usually measured with a micrometer, not a meter stick. Patience is paramount.
New tire assembly looks a beginning to a new plateau. Good luck. Cheers. -AC
Hopefully those new tires do the trick. I assume you have to machine new wheels to mount them?
I would think a reverse cone shape for at least a couple centemeters around that center would be best to keep the tire from expanding.Thank you all, yes it’s a learning process with me starting from scratch. So hopefully the proper tires will let me get more than three or four laps in before I have to bail out.
We were talking about the influence of the tight circuit yesterday, as others have visited the circuit with their proven fast cars only to find that they lose 1/3 of that speed at this track. A larger diameter would be “straighter” and presumably faster and importantly to me, easier on the car.
As you say you try these things and learn, others with experience probably wouldn’t have tried to make tires out of conveyor belt off cuts! On a positive note the other two wheels held up very well.
Yes you are quite right it’s back to the drawing board and machinery to make a pair of hubs to grip these tires.
They have quite a small opening at the centre, from eye it looks like between 3/4” and 7/8” so my previous design might not be suitable, perhaps one big bolt through the centre will do? Certainly easier to make!
One other thing, a fella videoed each of the cars running yesterday, so when I get some footage I’ll post it via YouTube.
Hey, look at it this way - they'll be fun parts to make. I always loved manual lathe work. Look forward to seeing what you come up with.Yup, I’ll have to get my protractor out