20 replies to this topic

[swodem]

I got given a very tired JK tire Truer this week. In pieces.
Actually I got given two. Well the second one wasn’t just for me -it’s working well and was donated by a racer from a nearby city for our Clubmembers use, but that’s another story. It’s working ok - just a coincidence.

The one I got in pieces was well flogged out. I rebuilt with new bearings and a good cleanup. I want it for occasional 2mm axle use rather than the 3/32 that’s used 99.9% of the time.

Sadly, I’ve found out my spare Hudy drum and 2mm tyre shaft don’t fit, the bearings have different spec. Hudy are 3x8x3 (mm) and JK are 1/8 x 5/16 x 1/8

So the shaft slops around - not very 'true'

A quick phone to the local hobby shops open today proved hopeless on replacement bearings, and I’m not even sure if I could shoehorn 8mm into a 5/16 hole anyway

So, then I had a 'Phenomenon' moment. Use the existing shaft, and just grind it down to size!

Out with the lathe, dremel and a grinding bit....voila!! Of course I did the 1/8th end so now can just swap it around and do 3/32....





Been a fruitful day in the end...

Now - where do I get a replacement motor for the JK from, this ones very noisy???


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[Bill from NH]

Check with a RC shop to see what they carry for motors or can order.

[swodem]

Check with a RC shop to see what they carry for motors or can order.

 

Yeah tried that Bill, all theirs are 50mm diameter. The JK is about 35mm

[gotboostedvr6]

How much TIR in that chuck?

[swodem]

How much TIR in that chuck?

 

Not a chuck. Its a collet.

 

Runout is less than the difference between an axle hole and axle shaft.

[John Streisguth]

Nice ingenuity on that set up!

[Geary Carrier]

This might work...

 

https://www.ebay.com...qcAAOSwOgdYwhmU

 

[swodem]

This might work...
 
https://www.ebay.com...qcAAOSwOgdYwhmU
 

Y’know I have checked all the dimensions and they seem fine, just rotation is wrong way. I need CW when viewed from the can end. This one is CCW


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[Racer36]

Being DC you can’t just switch leads? I’m not really familiar with that truer.

[swodem]

Well that will work but if the motor is timed it’ll be running retarded and burn out


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[Racer36]

My 11 year old Hudy has the original motor on it . I spin it up whichever direction the leads happen to land on the power supply. Live dangerously.... I suspect you will be fine.
Cheers

[Geary Carrier]

Adjustable timing?

 

https://www.ebay.com...5.c100005.m1851

 

[JK Products]

Hi Steve,

 

Send me an email and we should be able to help you out. 

 

Tim

[swodem]

Adjustable timing?
 
https://www.ebay.com...5.c100005.m1851
 

Nice looking motor but it’s still CCW at can end. I need CW otherwise all the rubber dust gets thrown skywards.

Steve


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[Zippity]

Steve,

 

I have a spare 12 volt motor that I bought from Jaycar as a replacement for my Hudy.

 

It is 35mm in diameter, has a .125" shaft, but runs CCW

 

When powered back to front, it still runs OK.

 

Want me to hold it for you for the Nats or is that too far away?

 

Ron

[swodem]

Send away Zip, I need to get this Truer ready for the Nats (ES24 car) - that’s what it’s for!!

Thanks man


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[swodem]

Parcel arrived on my desk this morning

Zippity to the rescue!!!

(Man did I ever think I would say that!!??)

Thanks Zip!




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[Zippity]

Wonders never cease.    

[swodem]

Cheers Zip - fits perfect.
It ain’t fast....but it’s smooth and quiet and I don’t run high RPM anyway when doing rubber




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[Racer36]

Nothing like a bit of Kiwi cooperation.....

[Zippity]