tyre truing

OXO cube · 11th-Mar-21, 07:45 PM

hi guys
advice needed

i am having real trouble truing the softer rubber tyres
they are just ' chewing up ' when i try
i have a 'TYRE TRUE' truer
the same as a razor
i run at low volts , slow speed and minimal amp usage as directed on many youtube vids
but the tyres start to chew up and rip ?

any help appreciated ... i have ruined 3x sets of tyres so far , 1x thunderslot TYROO5RX and 2x NSR ULTRA Angry

my wallet will be truely grateful

kev

KensRedZed · 11th-Mar-21, 07:54 PM

Hi Kev,

Can you try changing to a much finer grit surface and take more time?

Just an idea.

Nonfractal · 11th-Mar-21, 08:05 PM

Less pressure
Less speed
Use zippo fluid as a lubricant. Put it on he tyres and the grit surface and don't let it dry out while working the tyre.
True for 15 seconds, pause, restart...

Don't dump the tyres you think you've ruined. They are likely to be recoverable.

Alan W

OXO cube · 11th-Mar-21, 08:22 PM

hi alan
tried all 3
the problem is keeping the grit surface ON the grinding plate when using lighter fluid , it eats the adhesive tape almost immediately
any tips for the grit , grades / types to use and / or the method to keep it attached to the plate ?

also ken , i found ( wierdly ) finer grit was worse ?
have tried quite a large range so far :(

woodcote · 11th-Mar-21, 10:34 PM

The Thunderslot tyres are notoriously difficult to true and most people don’t bother. The NSR ultras are okay in my experience - and definitely need truing. I’m using 400 or 600 grit paper glued flat on the mdf plate of my DIY truer, with the tyres powered by the car at 12 volts. That means it’s very gentle pressure for 5 seconds on the paper and then lift... That’s needed to protect the motor, but it’s helping the tyres also. I don’t use any liquid, I just go very gently and patiently.

Nonfractal · 12th-Mar-21, 06:32 AM

(11th-Mar-21, 08:22 PM)OXO cube Wrote: the problem is keeping the grit surface ON the grinding plate when using lighter fluid , it eats the adhesive tape almost immediately

Sorry about that. Unexpected.
I use a large sheet and true in a similar way to Andy's DIY truer above.
Maybe you are using too much zippo?
"Damp", not "soaked" is how it should be

slotloco · 12th-Mar-21, 08:12 AM

Hold up, for me, there are some pieces of information missing

1) How do you glue the tyres on the wheels, and how do you apply the glue
2) - is the glue holding consistently, or are some parts of the outside edges coming unglued.
2) What glue do you use - is it reacting with the tyres, making them more prone to splitting
3) What voltage are you running the tyre true at?
4a) What is the amperage load when free spinning before the tyre touches the plate
4b) What is the amperage load when the tyre touches the plate

FWIW, When I use my RSM - same system, and very similar to the tyre true, which morphed into the Professor Motor 1401 lathe when Pete sold them the tooling and parts, I am watching current draw and RPM drop like a bomb squad guy watching a mercury switch when he cuts the wires.
And I only have about 240 grit on the plate, and almost never use any fluid - certainly not needed when doing an ultra-grip.

Anthony B · 12th-Mar-21, 06:14 PM

Can you put up a picture of your tyre truer please?

Will be able to then better understand possible issues....

Model Murdering · 12th-Mar-21, 06:25 PM

(11th-Mar-21, 10:34 PM)woodcote Wrote: The Thunderslot tyres are notoriously difficult to true and most people don’t bother. The NSR ultras are okay in my experience - and definitely need truing. I’m using 400 or 600 grit paper glued flat on the mdf plate of my DIY truer, with the tyres powered by the car at 12 volts. That means it’s very gentle pressure for 5 seconds on the paper and then lift... That’s needed to protect the motor, but it’s helping the tyres also. I don’t use any liquid, I just go very gently and patiently.

'Zactly! ... and Touche Andy.

Tool speed, technique, and voodoo mean nothing without patience

OXO cube · 12th-Mar-21, 07:53 PM

(12th-Mar-21, 08:12 AM)slotloco Wrote: Hold up, for me, there are some pieces of information missing

1) How do you glue the tyres on the wheels, and how do you apply the glue apply to wheel rim , them wipe away excess
2) - is the glue holding consistently, or are some parts of the outside edges coming unglued. glue is uniform and tyres stay in position
2) What glue do you use - is it reacting with the tyres, making them more prone to splitting nail varnish , no apparent issues
3) What voltage are you running the tyre true at? between 5-7 v
4a) What is the amperage load when free spinning before the tyre touches the plate cant remember , i true in garage and its freezing atm ... so im not checking hehehe
4b) What is the amperage load when the tyre touches the plate the moment i see a load change , i true until the load returns to the 'no load' amps

FWIW, When I use my RSM - same system, and very similar to the tyre true, which morphed into the Professor Motor 1401 lathe when Pete sold them the tooling and parts, I am watching current draw and RPM drop like a bomb squad guy watching a mercury switch when he cuts the wires.
And I only have about 240 grit ( this looks to be the difference im using 600 grit as my roughest surface ) on the plate, and almost never use any fluid - certainly not needed when doing an ultra-grip.

this is my truer Anthony
and a pic of the thunderslot tyre ( the biggest problem ) .... its like its being torn when truing ... pulling maybe 0.3mm chunks outa the tyre surface

one thing I'm not lacking in is patience ... but these tyres are testing me