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#131
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drill/tap in frames
The front and rear stays, which I suppose are
welded to the frame, and painted in the same color - these are 2 inches wide. The bottom stay, which is a long bracket with the form of the letter "Z", only not as steep, has two holes, one that goes into the BB and one that goes into the chainguard. This is the lowest contact point of the chainguard. This bracket is 1-1/8 inches wide. Or perhaps "thick" or "deep" is the word. Anyway this is how much (little) material is required for an M5 tap to work. Because that is what it does. This is not an exotic bike but the standard solution which I've seen hundred of times. -- underground experts united http://user.it.uu.se/~embe8573 |
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#132
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drill/tap in frames
The front and rear stays, which I suppose are
welded to the frame, and painted in the same color - these are 2 inches wide. The bottom stay, which is a long bracket with the form of the letter "Z", only not as steep, has two holes, one that goes into the BB and one that goes into the chainguard. This is the lowest contact point of the chainguard. This bracket is 1-1/8 inches wide. OK, change the above into sixteenths of an inch and it'll be correct as measured... -- underground experts united http://user.it.uu.se/~embe8573 |
#133
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drill/tap in frames
On Tuesday, July 17, 2018 at 4:22:48 AM UTC-4, Emanuel Berg wrote:
The front and rear stays, which I suppose are welded to the frame, and painted in the same color - these are 2 inches wide. The bottom stay, which is a long bracket with the form of the letter "Z", only not as steep, has two holes, one that goes into the BB and one that goes into the chainguard. This is the lowest contact point of the chainguard. This bracket is 1-1/8 inches wide. OK, change the above into sixteenths of an inch and it'll be correct as measured... -- underground experts united http://user.it.uu.se/~embe8573 We were discussing thread engagement. How thick are these attachment points? Again, normal practice is to have a thread engagement in a tapped hole equal to at least a diameter. Low stress applications can get by with less. There are lots of small-size nuts that are thinner than that one diameter rule of thumb. Sometimes, thin metal brackets or other items have the metal punched or extruded to give a bit more thread engagement. Again, this is for light loads. https://i.pinimg.com/236x/38/3d/a8/3...6deab279d9.jpg None of this makes it a good idea to drill and tap a main frame tube, at least not on a lightweight bike. - Frank Krygowski |
#134
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drill/tap in frames
Frank Krygowski wrote:
We were discussing thread engagement. How thick are these attachment points? Two occasions of 2/16 inches, and one 1/16 plus change, for M5s, with no extruded part. The load is the chainguard and chainguard bracket stay whose weights I can report back later tonight, God willing. -- underground experts united http://user.it.uu.se/~embe8573 |
#135
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drill/tap in frames
The load is the chainguard and chainguard
bracket stay whose weights I can report back later tonight, God willing. A typical chainguard including the bracket stay weighs in at 160g. -- underground experts united http://user.it.uu.se/~embe8573 |
#136
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drill/tap in frames
On 16/07/18 01:06, Frank Krygowski wrote:
On 7/14/2018 10:20 PM, David Scheidt wrote: AMuzi wrote: :Some builders at the cusp of change between 'no brazed bits' :and 'braze every possible thing' fashions (like Galmozzi) :brazed bolts on the tube and so nuts secured the bottle :cage. Odd looking but worked as well as anything. I got a nasty gash from a frame like that.Â* Just picked it up, and cut myself on the bolt. Yet another bicycling injury! I've had a piece of steel wire from the frayed end of a gear cable prick my finger. Does that count? There was blood... -- JS |
#137
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drill/tap in frames
On Wed, 18 Jul 2018 15:42:27 +1000, James
wrote: On 16/07/18 01:06, Frank Krygowski wrote: On 7/14/2018 10:20 PM, David Scheidt wrote: AMuzi wrote: :Some builders at the cusp of change between 'no brazed bits' :and 'braze every possible thing' fashions (like Galmozzi) :brazed bolts on the tube and so nuts secured the bottle :cage. Odd looking but worked as well as anything. I got a nasty gash from a frame like that.* Just picked it up, and cut myself on the bolt. Yet another bicycling injury! I've had a piece of steel wire from the frayed end of a gear cable prick my finger. Does that count? There was blood... O course it does. So long as you advertise it on RBT. |
#138
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drill/tap in frames
Today I finally spent some quality time on my own bike
again, and I put on the plastic Zefal bottle cage using cloth tape on the down tube and then two galvanized hoose clamps. The bottle cage is designed for screws but the result seemed solid enough. BTW it is an interesting bike. I think it is from the early-mid 80s. A steel frame, it has a Shimano Positron 5 shifter, but the single chainwheel is so big even on a flat surface, the biggest sprocket is the only one feasible to use. But I love it anyway thanks to the 630 wheels and cross levers for the rim brakes. -- underground experts exiled http://user.it.uu.se/~embe8573 |
#139
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drill/tap in frames
On 7/25/2018 8:36 AM, Emanuel Berg wrote:
Today I finally spent some quality time on my own bike again, and I put on the plastic Zefal bottle cage using cloth tape on the down tube and then two galvanized hoose clamps. The bottle cage is designed for screws but the result seemed solid enough. BTW it is an interesting bike. I think it is from the early-mid 80s. A steel frame, it has a Shimano Positron 5 shifter, but the single chainwheel is so big even on a flat surface, the biggest sprocket is the only one feasible to use. But I love it anyway thanks to the 630 wheels and cross levers for the rim brakes. cloth tape holds moisture against the finish; poor choice of material. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#140
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drill/tap in frames
AMuzi writes:
Today I finally spent some quality time on my own bike again, and I put on the plastic Zefal bottle cage using cloth tape on the down tube and then two galvanized hoose clamps. The bottle cage is designed for screws but the result seemed solid enough. BTW it is an interesting bike. I think it is from the early-mid 80s. A steel frame, it has a Shimano Positron 5 shifter, but the single chainwheel is so big even on a flat surface, the biggest sprocket is the only one feasible to use. But I love it anyway thanks to the 630 wheels and cross levers for the rim brakes. cloth tape holds moisture against the finish; poor choice of material. Against the finish? -- underground experts exiled http://user.it.uu.se/~embe8573 |
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