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Apparently not all recessed brake bolts are the same diameter?

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Apparently not all recessed brake bolts are the same diameter?

Old 05-21-23, 10:03 AM
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Apparently not all recessed brake bolts are the same diameter?

Oops. Snag. I thought the OD of recessed nuts were the same 1.0 mm. Are there thinner ones or is it just a funky frame that wants thinner.

Now whether to drill/auger/file it larger or source thinner nuts
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Old 05-21-23, 10:30 AM
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Originally Posted by jdawginsc
Oops. Snag. I thought the OD of recessed nuts were the same 1.0 mm. Are there thinner ones or is it just a funky frame that wants thinner.

Now whether to drill/auger/file it larger or source thinner nuts

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a nut with an OD of 1.0mm would be a fitting suitable for a watch movement

in my experience all of the brake mounting bolts have worked with have had a thread of 6.0mm X 1.0

even an angry Terminator would have difficulty starting a 1.0mm OD nut on such a bolt


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Old 05-21-23, 10:31 AM
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Originally Posted by juvela
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a nut with an OD of 1.0mm would be a fitting suitable for a watch movement

in my experience all of the brake mounting bolts have worked with have had a thread of 6.0mm X 1.0

even an angry Terminator would have difficulty starting a 1.0mm OD nut on such a bolt


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Haha. Oops. That SHOULD say 8.0 mm OD. I need something about 7.0mm or have to expand the hole to 8.0 mm
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Old 05-21-23, 10:35 AM
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Buono incasso!


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Old 05-21-23, 10:40 AM
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Weird. Same diameter. Longer bolt wont go in, shorter with ease.
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Old 05-21-23, 10:55 AM
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incasso brake mount holes are counterbored on their backside

a small diameter hole to accept the diameter of the nut's "sleeve" and a larger counterbore to accept the head/flange of the "nut"


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Old 05-21-23, 11:00 AM
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yes that hole looks like it already has a bushing in it.

try putting your nut on a piece of threaded material and chuck it in your drill. Using a flat file very carefully, reduce the diameter just enough to fit.

Or, using your 5-axis Mori-Seiki machining center, turn a new part out of titanium, preferably in an exotic alloy like Ti6Al7Nb

/markp
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Old 05-21-23, 11:10 AM
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Hey! This isn't the Huffy/Campy weight weenie thread. Besides that Ti needs a Trizac belt to form it into shape. Har! MH
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Old 05-21-23, 11:36 AM
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next we shall be getting a report from Scotty on the status of the dilitihium crystals...

"beameth me uppeth Scotty"


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Old 05-21-23, 11:37 AM
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Disc brakes solve this problem.

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Old 05-21-23, 11:56 AM
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Originally Posted by jdawginsc
Weird. Same diameter. Longer bolt wont go in, shorter with ease.
Check that the screw-end of the longer nut doesn't have a slightly raised lip, the manner of cutting it to length can produce such
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Old 05-21-23, 11:56 AM
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Originally Posted by tyrion
Disc brakes solve this problem.

Rims brakes *are* disc brakes.
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Old 05-21-23, 12:43 PM
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That's what you get for messing with non-vintage stuff. Welcome to the March of Time, with innovations we didn't need that prevent us from doing the simplest things that used to work just fine.
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Old 05-21-23, 01:38 PM
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Originally Posted by oneclick
Check that the screw-end of the longer nut doesn't have a slightly raised lip, the manner of cutting it to length can produce such
I am assuming that was the issue. Cleaned up the hole with a drill and sanded the end of the bolt.

problem averted...

And for sure the modern stuff is not always made to tolerances but this frame is actually pretty decently made.
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Old 05-21-23, 01:54 PM
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Originally Posted by Charles Wahl
That's what you get for messing with non-vintage stuff. Welcome to the March of Time, with innovations we didn't need that prevent us from doing the simplest things that used to work just fine.

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