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New tire donuts - how do you make the first deep cut?


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#1 Joe Rose IV

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Posted 12 June 2017 - 03:22 PM

I may be impatient but don't have a Hudy but an old school truer so I'd like to know how you guys make a deep first cut to a fresh donut to cut back the time it would take for final truing. Also how you'd keep the first cut flattish?






#2 Cheater

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Posted 12 June 2017 - 03:36 PM

Joe,

I've done it with a #11 X-Acto blade coming in the side of the tire in the past, but not in a long time.

Can you post a pic of your tire truer? "Old school" doesn't say much, as an old school tire truer to me is a wide emery board!


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#3 Joe Rose IV

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Posted 12 June 2017 - 04:10 PM

truer.jpg
 

This is the deal.



#4 Joe Rose IV

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Posted 12 June 2017 - 04:13 PM

I can do side cuts for width but I'd like a quick meaty flat cut and not leave the thing on to cook the donut.



#5 Zippity

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Posted 12 June 2017 - 04:13 PM

If you can change the cutting disk, try using a coarser sandpaper.
 
Otherwise, a hand drill can be used to cut the worse of the rubber away :)

#6 bbr

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Posted 12 June 2017 - 04:39 PM

R-Geo makes a tool that can reduce the diameter quickly. A pointy rod on a guide.


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#7 Steve Deiters

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Posted 13 June 2017 - 12:18 PM

I've found that cutting "Wonder" rubber just takes a lot of time and patience. Go too fast, you overheat them and they start to smoke. Go too slow... well... it just takes a long time.

#8 Ramcatlarry

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Posted 13 June 2017 - 08:44 PM

I made a tool post for my Dremel on my Sherline 3" lathe. Cut-off wheel does just fine for rough cut.


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#9 Joe Rose IV

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Posted 13 June 2017 - 10:38 PM

You still use that set-up?

#10 swodem

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Posted 30 July 2017 - 08:24 PM

Easy

062bbe7e0854b50ec915c3ae851ad716.jpg

Get a FITT tyre truer and cut all the cores and sides off you want quickly

I did all these in 30min while talking on the phone, on my kitchen bench...


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#11 Zippity

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Posted 31 July 2017 - 12:18 AM

I normally sit on a chair when I use the phone :)  :)


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#12 Bazzie

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Posted 02 August 2017 - 02:54 PM

I have a tire truer similar to yours and the one thing that helped immensely was the sandpaper. I went through 3-4 different types before finding the best cut and it turned out the type of texture you get on sanding belts - the red ones - work best. I also took a piece of piano wire and ground a flat with my Dremel at a sharp angle, which I use to cut the width and do the first deep cut. Not as good as some of the tools I've seen but it works


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#13 Booger

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Posted 10 August 2017 - 06:13 PM

I made a stepped slug in my lathe......One end fits inside the rim,the other is the diameter I want the first cut.....Push inside rim,use exacto to rough out tire....Quick and painless.


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#14 swodem

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Posted 13 August 2017 - 05:26 PM

I made a stepped slug in my lathe......One end fits inside the rim,the other is the diameter I want the first cut.....Push inside rim,use exacto to rough out tire....Quick and painless.


Post a pic please
Sounds not a bad idea


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#15 gc4895

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Posted 14 August 2017 - 10:04 AM

What does a FITT tyre truer (did you mean "tire" ? Just kidding!) look like?
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#16 swodem

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Posted 14 August 2017 - 03:34 PM

What does a FITT tyre truer (did you mean "tire" ? Just kidding!) look like?


This is it with the drum off, and coring needle fitted

37633d56c5448601ee35a56f3df42a5e.jpg




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#17 swodem

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Posted 15 August 2017 - 02:13 PM

Getting some tyres ready last night, for testing tonight...

cc8f84c7eeaddf06ffdf531355080d01.jpg


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