drill/tap in frames

Jeff Liebermann wrote:
:On Mon, 9 Jul 2018 16:21:43 +0000 (UTC), David Scheidt
wrote:

:sms wrote:
::On 7/7/2018 7:27 AM, Emanuel Berg wrote:
:: Are there any secrets to drilling holes in
:: steel bike frames? I have a couple of discarded
:: ones I can test on but I thought I'd
:: ask anyway.
::
:: Do you use normal power hand tools like
:: a drill-screwdriver and/or a drill press (if
:: possible with the desired bolt position)?
::
:: Do the normal rules apply, e.g. to get
:: a threaded hole for an M6, you first drill with
:: a 5.0mm drill?
::
:: And you can use chainsaw oil, right?
:
::As Jobst Brandt stated: "I don't know many riders who believe that
::drilling a hole in a frame tube is a reasonable concept."

:Who cares what riders think, what do the egineers do?

:Jobst Brandt was a mechanical engineer.
:https://en.wikipedia.org/wiki/Jobst_Brandt

he was also wrong about many things. Every bike I've ever had has had
holes drilled in it. Clearly, there is a range of holes that do not
cause failure, and some that do. The question is where does a rivnut
fall? I wouldn't drill a 5 mm hole a on 26mm diameter tube, but they
work fine on large diamter ones.


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