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Boring out brass tubing


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#1 Fred_J

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Posted 21 May 2020 - 02:01 PM

Every once in a while boring out brass tubing is mentioned. How do you drive that? Using a drill bit? If I wanted to bore out a D3 axle tube, how would I go about it?
Fred Jespersen




#2 Dave Crevie

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Posted 21 May 2020 - 02:25 PM

See other post.



#3 Ramcatlarry

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Posted 21 May 2020 - 06:16 PM

or a reamer.


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#4 Dominator

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Posted 21 May 2020 - 06:45 PM

If your cutting 7/32 round tubing I use a tubing cutter then use an x-acto to de-burr it.  If the ends need to be opened up a bit I used the handle end of a round file or the file itself.

 

If your looking for a normal size tube, 1.400" for example, Chicago Land has them precision cut and very worth the price.  No burr's to clean up.  They are all I used on my builds.

 

If your cutting say 3/32 round or square tubing I just use a dremel with a cut off wheel then use an x-acto to de-burr.  Some builders will use a mini chop saw to get nice square cuts.  These are available through Harbor Freight.  Not sure of who else makes them.


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#5 MSwiss

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Posted 21 May 2020 - 07:16 PM

Dom,
Thanks for the props on my 80 cent, precut, 7/32" bearing tubes.

I also make them in 1.1".

Fred,
Are you looking to deburr the axle tube, or actually make the bore larger?

If the latter, why?

I also asked you a question, in your thread, about Cox controllers.

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#6 Fred_J

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Posted 22 May 2020 - 11:05 PM

Hi Mike! Back in the early 70s, I read an article in Miniature Auto Racing that suggested that using an overbored front axle tube could act like an iso fulcrum chassis. I was wondering if that was true, so first, I would like to know the right way to overbore a brass tube. I was also thinking of using a metric sized tube.




Fred Jespersen

#7 Fred_J

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Posted 22 May 2020 - 11:17 PM

Here is the second page of the article9660D69B-D280-4859-BD9B-3E94662F784F.jpeg
Fred Jespersen

#8 MSwiss

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Posted 22 May 2020 - 11:22 PM

Is this for a Retro car you intend to race?

If so, keep in mind the car is teched for front and rear clearance, with the front wheels on the tech block.

FWIW, very few people race Retro with an axle rotating in a tube. 

Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#9 Fred_J

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Posted 22 May 2020 - 11:26 PM

Yes, I’m thinking about a D3 car. I think it could pass tech as long as the chassis clearance is legal while measuring from the highest part of the axle tube. And I think it would work with an independent front wheels, as long as an axle was being used.
Fred Jespersen

#10 Fred_J

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Posted 22 May 2020 - 11:29 PM

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Fred Jespersen





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