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Trouble getting donuts on a wheel


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#1 eAddict

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Posted 14 November 2017 - 10:30 PM

I have attached an image showing the pieces I have available to me to help slip a donut over a wheel.  One is too large (red) the other too small (green).  Short of hiring someone to mill something for me I am open to suggestions to get either to work.  To be honest I tried the larger one and it tore the donut though the donut, at least to me, had a large opening.  
 
Thanks for any advice.
Vince

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  • WontFit.png





#2 Ralph Thorne

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Posted 14 November 2017 - 10:40 PM

Have you tried dipping the donut in lacquer to help it slide easier?
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#3 eAddict

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Posted 15 November 2017 - 08:01 AM

Have you tried dipping the donut in lacquer to help it slide easier?

Yes. I have no issue when the guide fits over properly. This is just a tough case for me.



#4 Rob Voska

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Posted 15 November 2017 - 08:35 AM

How hard of a donut are you trying to mount?  What is donut ID?  What is hub OD?



#5 Zippity

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Posted 15 November 2017 - 12:26 PM

Try coring your donuts first :)



#6 Pablo

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Posted 15 November 2017 - 01:51 PM

The larger of the two cones is the better choice.

But I think you have other issues than the cone size.

 

Go somewhere they have fireworks celebrations and pick up some plastic cones contained in the (used) rockets.

Size them however you want. I like my JK donut tool but for huge donuts I go to my plastic cones.

They are FREE :dance3:


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#7 eAddict

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Posted 15 November 2017 - 05:26 PM

How hard of a donut are you trying to mount?  What is donut ID?  What is hub OD?

They are Alpha Wonder Rubber donuts.  This batch has been in a sealed bag in a fridge for awhile...  I let them come to room temp before using them.  I think by me pulling down not evenly I caused the issue.  I am heading out to get another device and a large washer.  



#8 eAddict

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Posted 15 November 2017 - 05:29 PM

Try coring your donuts first :)

How does one drill/core into the rubber evenly?



#9 Zippity

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Posted 15 November 2017 - 05:36 PM

Vince,

 

I use a diamond donut hole enlarger (available from hobbiesplus.co.nz in variousn sizes) to open up (core) my donuts to assist in making it easier to slide them onto my hubs. Click here.

 

Ron Hershman, some time back, posted a 101 on how to mount donuts.

 

I dunk both the pre-glued hub and donut in white spirits immediately prior to marrying the two. 

 

I have no difficulties :)


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#10 Zippity

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Posted 15 November 2017 - 05:36 PM

How does one drill/core into the rubber evenly?

 

Carefully :)

 

I use a battery powered hand drill at low revs, making sure that I don't grip the donut too tightly.



#11 Frankie Schaffier

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Posted 15 November 2017 - 07:09 PM

I tried to use the tool, it took to long. I use Ron's method with zero issues. As Zippity said, dunk both in your chem. of choice then just slide them on. I give the a little twist just to make sure it's evenly coated/seated. After a while you'll learn to eyeball how far you push it on the wheel to be trimmed. Make little 3/32 wire J hooks to screw your wheels to.. Gives you something to hold on to, and allows you to hang your wheels to dry a bit after the glue is applied.
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#12 eAddict

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Posted 16 November 2017 - 09:35 AM

Thanks for all the feedback.  I have used the tutorials mentioned in the past and they work great.  My issue this time is the slide part isn't the same size as the proTrack hubs.  I need to become friends with a machinist.



#13 chasbeeman

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Posted 19 November 2017 - 10:04 AM

Thanks for all the feedback.  I have used the tutorials mentioned in the past and they work great.  My issue this time is the slide part isn't the same size as the proTrack hubs.  I need to become friends with a machinist.

What do you think about this 83105f787542d23329a320793572a169.jpg

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8e4d0f5cd69596afe22ee6d396a2eab4.jpg
Charles Beeman

#14 Zippity

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Posted 19 November 2017 - 03:00 PM

It looks like a spent rifle cartridge.

 

Please explain how you use it.



#15 chasbeeman

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Posted 21 November 2017 - 02:44 PM

It looks like a spent rifle cartridge.
 
Please explain how you use it.

.50 cal. To be exact, the bore on small end where the bullet had been has a steel plug press fit in place. Bored for 3/32 or 1/8 axle. The rim is set screwed in place on axle then glue applied. The cartridge then slides down the axle over the rim. Donut dipped in lighter fluid or lacquer thinner slides down the cartridge with the help of washer. Donut held flat to base plate and pull cartridge upward and donut snaps onto glued rim without pushing glue out.

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#16 Bazzie

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Posted 25 November 2017 - 02:08 PM

Chas, so with this method I assume you don't put glue on the donut, only on the rim? Also, how long after putting the glue on do you slide the donut on?


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#17 swodem

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Posted 25 November 2017 - 10:57 PM

I think the method Zippity posted is the easiest

I have easily fitted small-hole fine-pore donuts over 12mm rims using this method

 

I cant understand how big you would need to go to tear a donut?



#18 Zippity

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Posted 26 November 2017 - 03:05 AM

This is the tool I was referring to :)

 

donutenlargermm.jpg



#19 swodem

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Posted 26 November 2017 - 05:29 AM

What diameter is that? looks pretty small if that shaft fits a dremel



#20 Zippity

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Posted 26 November 2017 - 10:21 AM

Who said anything about using a Dremel?    :(

 

See edited post above.



#21 chasbeeman

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Posted 27 November 2017 - 10:45 AM

Chas, so with this method I assume you don't put glue on the donut, only on the rim? Also, how long after putting the glue on do you slide the donut on?


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Correct just glue the rim only, usually just a few minutes but the solvent will reactivate glue for a good bond. Using alpha jumbo donuts which the hole is too small for large protrack rim unless using this method of installation.

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