Re: RE: Re: Past discussions

On 4/6/2025 3:59 PM, cyclintom wrote:

On Sun Apr 6 13:09:50 2025 Frank Krygowski  wrote:

On 4/6/2025 12:04 PM, AMuzi wrote:

On 4/6/2025 11:01 AM, cyclintom wrote:

Remember when I said that my bike had 4 mm screws for the water bottle
mount? Flunky told you all that I was lying because 5 mm was the
standard for all water bottle mounts. Funny thing is that my new Time
ULTeam uses 3 mm with a wide head. Perhaps Flunky can suggest why the
country of the Tour de France doesn't stick to his "standard"?

>
My $5 says it's not a 3mm screw.
Remove that screw and measure it.
>
More probably a ULS or a 7991 screw, m5x0.8 with a 3mm hex broach on the
head.

>
Agreed, although I'd bet more than $5.
>
It seems Tom doesn't know how to measure or specify a screw size.

 Apparently the professor of mechanical engineering doesn't know what a digital caliper is or how to use it.

:-)  Says the only guy here who thinks those screws are 4mm! Note that the professional bike mechanic disagrees with you!
I just measured one, but I'm a retrogrouch, Tom. I didn't use a digital caliper. I used a Vernier caliper. (Do you know how to read a Vernier scale? I'm betting on "no.")
I got 4.80 mm for the major diameter of the thread, or 0.192". Yes, threads are almost always a tiny fraction smaller than their nominal diameter. Those screws are absolutely not 4mm on any frame I've seen.

Again Frank cannot keep himself from speaking about what he knowsz not.

Have you figured out how to post a link to a photo? Show us a screw partially inserted in that mysterious threaded boss, and show us how you're measuring its diameter.
BTW, besides working with various inductive proximity sensors and other industrial sensors, besides working with Labview data acquisition techniques, our students had to learn to use various machinist's measuring tools - from gage blocks to vernier calipers - in the Physical Measurements course. As I've said before, Tom, you couldn't have made it through the program.
--
- Frank Krygowski