Telescoping Tube Clamps
Here I show how to make a telescopic pipe clamp joint that allows the length and rotation connection between the two tubes to be very strong, light and adjustable.
When there is only a small gap between the tube and the tube, it can be expanded.
If you can squeeze a larger tube, you can make a very, very strong linkage mechanism that can be adjusted in terms of length and rotation.
There are a lot of uses in this regard.
The most familiar example is to make the bike seat height adjustable, but with your imagination, you will have more than a dozen uses in a few minutes.
I am using these telescopic clamps to make rigid but removable side walls for a light bike trailer, and when I want to take him further than he can run with me, it willI like to bike-tour).
The trailer can then be reconfigured as a flat plate when needed, or as a rigid mounting platform for power art and other whimsical works.
You need two steel pipes of complementary size. approx.
1/2 \"1/2 length\" square bar-
Stock Steel with the same diameter as the outer diameter of the larger tube for each flap vertical mill (
Used with a milling machine).
Drill bit and thread tap for the size screw you use to close the fixture (I used #8-32 tap and 0. 140\" drill)
The drill bit that expands the screw hole to the gap diameter (I used 0. 180\" for #8-32).
Angle grinder with thin cutting wheel (recommended)
Or hacksaw or band saw.
Silver copper wire (
I got Harris safe.
In my local welding workshop.
This should not be confused with silver.
Electronic welding of bearings: if it is for electronic products or for use with iron, not a hot flame, this is not what we want. )Brazing flux (
White brazing flue]An oxy-
A fuel torch like propane or acetylene.
The sandblasting machine does help to clean up the flux after brazing, but it is not absolutely necessary.
We\'re basically making a screw.
Tight belt buckle for pipe.
We will forge on a metal label and then cut the label in the process of changing half of the \"O\" cross section to the \"C\" cross section. Threading one (
Half of the original)
Label of one screw and drill hole (
Half of the original)
Tab of the gap hole completes the locking fixture.
It is now possible to pull the two halves together with the screws, firmly clamping the inserted tube.
This locking pipe clamp can now be used as a part in a larger assembly.
I connect these clips to my bike trailer frame with angle welding.
Although you can make a telescopic joint with anything (
And the carbon fiber pipe is very delicate)
I care about the metal here.
Telescopic joints require pipes, and the cheapest pipes cannot work because of these limitations: its welds are proud to be on the inner or outer surfaces of the entire length.
It gets stuck and blocked.
Instead, what we want is a \"circular seamless\" pipe, also often referred to as a \"stretch on the core\" or \"DOM\" pipe, or \"aircraft-level pipe \".
It is more expensive and sometimes a few dollars per foot as it has gone through additional steps to make it smooth inside and outside and consistent.
But it inspired the project: it was glorious to see it.
If you\'re not inspired by a thin section
There\'s something wrong with the walled DOM pipeline.
Smooth, flawless, sturdy, light, elastic and straight like arrows. So many uses.
What kind of metal to get: I usually get \"chromium\" steel, 4130 chromium molybdenum alloy;
It\'s just great stuff.
It is easy to process, can be hardened, easy to weld, and has better yield strength and scalability than other grade steel (
It can stretch or bend further than other steel, and can still return to its original shape without damage, without being too brittle at the same time).
Because of these properties, it\'s go-
Prepare the alloy for the builders of the light solid frame, whether it\'s an airplane, a bicycle or anything in (or beyond! ).
However, you need to educate yourself how to use it, as it may inadvertently Harden because the cooling is too fast.
In general, after turning red, let it cool as slowly as possible.
Note: the brightness of the frame that can be achieved with this alloy does not come from any specific brightness of the alloy itself: it is as dense as any other type of steel.
The reason why the frame made of this alloy is lighter is that this alloy is stronger, so you can make the Tube with thinner walls with less metal.
What to get * diameter * tubing (
Where to get it)
: The size already produced by seamless pipe manufacturers is limited for you, so buy a pipe size table and start looking for the most suitable size: the inner diameter of the larger tube should be a few inches larger than the outer diameter of the smaller tube.
The gap is too small, it will be very difficult to insert;
The gap is too large to clamp and the joints are not very rigid.
In the various 4130 seamless pipe sizes provided by the Aircraft Spruce, I found that it is good to get the pipe effect in the 1/8 inch outer diameter step when the outer pipe wall thickness is 0. 058\".
This is because the wall thickness of 2 adds up to 0.
116 \", leaving 0.
The gap around the 1/8-inch incremental tube under 009 \"is small.
It would be better to have a little less gap, but this is good for my application.
The wall thickness of the innermost tube is entirely up to you.
It does not need to have any specific wall thickness other than your strength requirements.
I used 5/8 \"OD, 0.
035 \"wall thickness, the wall of my trailer is made of tubular columns, where the pipe clamp is 3/4\" 0. 058\" wall.
If you want to make a long telescopic metal arm, you can use a variety of diameter nesting together as long as they are incremental in 1/8 inch and 0.
058 \"wall, or other complementary pairing.
They sell the pipeline in increments of 1/8 inch all the way to 2 \"so you can have a lot of connections!
The metal label will be welded to the tube, drilled and excavated and cut in half to make two labels that can be stretched together by screws.
The first step is to cut off a large piece of bar stock and leave about 1/2 cubes.
I used a band saw.
Here, I made ten blocks at a time.
I sorted the end of the block in the mill, but it was purely aesthetic.
At the end of the day, we will weld this metal label silver to the pipe, these two things (
Labels and tubes)
It is almost necessary to fully meet the requirements of the other party. (
When melted, the silver solder paste is stretched between the tightly fitted surfaces, but not by the large irregular gap stretching caused by the imperfect fit. )Use an end-
The same mill as the outer diameter (clamp)
Tube, 3/4 \"in my case, make the bar-
The stock pieces are fully installed on the tube.
Decide what size screws you will use to tighten the tube and drill holes on the tab perpendicular to the curved tab axis. For the #8-
I used 32 screws and I drilled a 0. 140\" hole.
Drill as close as possible to the tab\'s curved surface so that the screw\'s tension does not affect most of the lever
ARM: Instead of bending the label, we use it to apply tension to the wall of the pipe.
Your walkthrough will last longer if you use a center
Start drilling.
If you use coolant/lubricant, your drill will also last longer.
We only make half of the holes into a line, so don\'t be afraid to beat that center down.
Drill down to the shoulder, slightly greater than 0. 25\" (half of the 0. 5\" tab width).
This half-length hole will not be threaded and will be drilled larger later to allow the screw to pass through.
I use these telescopic clips as the rear
The stand on the wall of the bike trailer, so only about 2 are needed.
The total length of the clip is 5 inch.
Cut the pipe clip to any length you need and use de-
Burrs tools or sanding machines.
Brazing is a process of intermediate temperature in whichmelting-
Point alloys are used to bring together two pieces of metal \"hot glue.
It is best to weld in this application, because base metal pieces do not change the shape.
This is critical for nesting, closing
Install something like these telescopic fitting joints, because if the metal changes shape, or if the weld puddle penetrates into the inner diameter of the tube, the tube will not be installed together again smoothly.
Brazing is also very strong, close to the strength of base metal.
Although its use is similar to electronic welding, the difference is that it is stronger and melts at higher temperatures.
Your metal will be red.
It\'s hot when the brain flows.
To make a good brazing joint, keep these things in mind: there are many kinds of alloys used for brazing.
Some are more fluid and some are more viscous.
Here, I am using a \"silver brazing alloy\" with a silver content of 45% \"(\"Safety-
Silv 45 by Harris welding supplies company\".
It flows like water, and once hot enough, it is required by the capillary tension to pull into the tight gap between the tube and the label.
About half the silver bearing solder-
Silver can be expensive-
I think I bought this Troy for $45-
Oz container
But very little money is needed to fill that gap. (
I bought this one ounce.
About two years ago, there were a lot of silver copper coils).
For each label, the length of the copper wire you need is less than 1/2.
Other brazing alloys are also available, and bronze and brass are popular.
These are more commonly used in \"fillet brazing\", creating a large fillet like a cauldron at the junction of two pieces of metal.
When the clip is drawn off, we don\'t want it to be closed more at the top of the label than at the bottom of the label (
The orientation term here assumes that the tube axis is vertical).
The kind of closure I call \"tapered\" would squeeze the pipe in a very small range, tend to curl/dent it at less than the clamping force we can withstand when clamping in a larger area.
The line shown in the cut can make the fixture turn off without turning it into a cone.
Tip: Don\'t cut too far!
Centered in the middle of the tab, it is enough to cut the cut line of one quarter of the circumference to 1 out of 3.
If you cut too far, the clip will be over-weakened.
Use the angle grinder with a thin cutting wheel carefully (
When there is only a small gap between the tube and the tube, it can be expanded.
If you can squeeze a larger tube, you can make a very, very strong linkage mechanism that can be adjusted in terms of length and rotation.
There are a lot of uses in this regard.
The most familiar example is to make the bike seat height adjustable, but with your imagination, you will have more than a dozen uses in a few minutes.
I am using these telescopic clamps to make rigid but removable side walls for a light bike trailer, and when I want to take him further than he can run with me, it willI like to bike-tour).
The trailer can then be reconfigured as a flat plate when needed, or as a rigid mounting platform for power art and other whimsical works.
You need two steel pipes of complementary size. approx.
1/2 \"1/2 length\" square bar-
Stock Steel with the same diameter as the outer diameter of the larger tube for each flap vertical mill (
Used with a milling machine).
Drill bit and thread tap for the size screw you use to close the fixture (I used #8-32 tap and 0. 140\" drill)
The drill bit that expands the screw hole to the gap diameter (I used 0. 180\" for #8-32).
Angle grinder with thin cutting wheel (recommended)
Or hacksaw or band saw.
Silver copper wire (
I got Harris safe.
In my local welding workshop.
This should not be confused with silver.
Electronic welding of bearings: if it is for electronic products or for use with iron, not a hot flame, this is not what we want. )Brazing flux (
White brazing flue]An oxy-
A fuel torch like propane or acetylene.
The sandblasting machine does help to clean up the flux after brazing, but it is not absolutely necessary.
We\'re basically making a screw.
Tight belt buckle for pipe.
We will forge on a metal label and then cut the label in the process of changing half of the \"O\" cross section to the \"C\" cross section. Threading one (
Half of the original)
Label of one screw and drill hole (
Half of the original)
Tab of the gap hole completes the locking fixture.
It is now possible to pull the two halves together with the screws, firmly clamping the inserted tube.
This locking pipe clamp can now be used as a part in a larger assembly.
I connect these clips to my bike trailer frame with angle welding.
Although you can make a telescopic joint with anything (
And the carbon fiber pipe is very delicate)
I care about the metal here.
Telescopic joints require pipes, and the cheapest pipes cannot work because of these limitations: its welds are proud to be on the inner or outer surfaces of the entire length.
It gets stuck and blocked.
Instead, what we want is a \"circular seamless\" pipe, also often referred to as a \"stretch on the core\" or \"DOM\" pipe, or \"aircraft-level pipe \".
It is more expensive and sometimes a few dollars per foot as it has gone through additional steps to make it smooth inside and outside and consistent.
But it inspired the project: it was glorious to see it.
If you\'re not inspired by a thin section
There\'s something wrong with the walled DOM pipeline.
Smooth, flawless, sturdy, light, elastic and straight like arrows. So many uses.
What kind of metal to get: I usually get \"chromium\" steel, 4130 chromium molybdenum alloy;
It\'s just great stuff.
It is easy to process, can be hardened, easy to weld, and has better yield strength and scalability than other grade steel (
It can stretch or bend further than other steel, and can still return to its original shape without damage, without being too brittle at the same time).
Because of these properties, it\'s go-
Prepare the alloy for the builders of the light solid frame, whether it\'s an airplane, a bicycle or anything in (or beyond! ).
However, you need to educate yourself how to use it, as it may inadvertently Harden because the cooling is too fast.
In general, after turning red, let it cool as slowly as possible.
Note: the brightness of the frame that can be achieved with this alloy does not come from any specific brightness of the alloy itself: it is as dense as any other type of steel.
The reason why the frame made of this alloy is lighter is that this alloy is stronger, so you can make the Tube with thinner walls with less metal.
What to get * diameter * tubing (
Where to get it)
: The size already produced by seamless pipe manufacturers is limited for you, so buy a pipe size table and start looking for the most suitable size: the inner diameter of the larger tube should be a few inches larger than the outer diameter of the smaller tube.
The gap is too small, it will be very difficult to insert;
The gap is too large to clamp and the joints are not very rigid.
In the various 4130 seamless pipe sizes provided by the Aircraft Spruce, I found that it is good to get the pipe effect in the 1/8 inch outer diameter step when the outer pipe wall thickness is 0. 058\".
This is because the wall thickness of 2 adds up to 0.
116 \", leaving 0.
The gap around the 1/8-inch incremental tube under 009 \"is small.
It would be better to have a little less gap, but this is good for my application.
The wall thickness of the innermost tube is entirely up to you.
It does not need to have any specific wall thickness other than your strength requirements.
I used 5/8 \"OD, 0.
035 \"wall thickness, the wall of my trailer is made of tubular columns, where the pipe clamp is 3/4\" 0. 058\" wall.
If you want to make a long telescopic metal arm, you can use a variety of diameter nesting together as long as they are incremental in 1/8 inch and 0.
058 \"wall, or other complementary pairing.
They sell the pipeline in increments of 1/8 inch all the way to 2 \"so you can have a lot of connections!
The metal label will be welded to the tube, drilled and excavated and cut in half to make two labels that can be stretched together by screws.
The first step is to cut off a large piece of bar stock and leave about 1/2 cubes.
I used a band saw.
Here, I made ten blocks at a time.
I sorted the end of the block in the mill, but it was purely aesthetic.
At the end of the day, we will weld this metal label silver to the pipe, these two things (
Labels and tubes)
It is almost necessary to fully meet the requirements of the other party. (
When melted, the silver solder paste is stretched between the tightly fitted surfaces, but not by the large irregular gap stretching caused by the imperfect fit. )Use an end-
The same mill as the outer diameter (clamp)
Tube, 3/4 \"in my case, make the bar-
The stock pieces are fully installed on the tube.
Decide what size screws you will use to tighten the tube and drill holes on the tab perpendicular to the curved tab axis. For the #8-
I used 32 screws and I drilled a 0. 140\" hole.
Drill as close as possible to the tab\'s curved surface so that the screw\'s tension does not affect most of the lever
ARM: Instead of bending the label, we use it to apply tension to the wall of the pipe.
Your walkthrough will last longer if you use a center
Start drilling.
If you use coolant/lubricant, your drill will also last longer.
We only make half of the holes into a line, so don\'t be afraid to beat that center down.
Drill down to the shoulder, slightly greater than 0. 25\" (half of the 0. 5\" tab width).
This half-length hole will not be threaded and will be drilled larger later to allow the screw to pass through.
I use these telescopic clips as the rear
The stand on the wall of the bike trailer, so only about 2 are needed.
The total length of the clip is 5 inch.
Cut the pipe clip to any length you need and use de-
Burrs tools or sanding machines.
Brazing is a process of intermediate temperature in whichmelting-
Point alloys are used to bring together two pieces of metal \"hot glue.
It is best to weld in this application, because base metal pieces do not change the shape.
This is critical for nesting, closing
Install something like these telescopic fitting joints, because if the metal changes shape, or if the weld puddle penetrates into the inner diameter of the tube, the tube will not be installed together again smoothly.
Brazing is also very strong, close to the strength of base metal.
Although its use is similar to electronic welding, the difference is that it is stronger and melts at higher temperatures.
Your metal will be red.
It\'s hot when the brain flows.
To make a good brazing joint, keep these things in mind: there are many kinds of alloys used for brazing.
Some are more fluid and some are more viscous.
Here, I am using a \"silver brazing alloy\" with a silver content of 45% \"(\"Safety-
Silv 45 by Harris welding supplies company\".
It flows like water, and once hot enough, it is required by the capillary tension to pull into the tight gap between the tube and the label.
About half the silver bearing solder-
Silver can be expensive-
I think I bought this Troy for $45-
Oz container
But very little money is needed to fill that gap. (
I bought this one ounce.
About two years ago, there were a lot of silver copper coils).
For each label, the length of the copper wire you need is less than 1/2.
Other brazing alloys are also available, and bronze and brass are popular.
These are more commonly used in \"fillet brazing\", creating a large fillet like a cauldron at the junction of two pieces of metal.
When the clip is drawn off, we don\'t want it to be closed more at the top of the label than at the bottom of the label (
The orientation term here assumes that the tube axis is vertical).
The kind of closure I call \"tapered\" would squeeze the pipe in a very small range, tend to curl/dent it at less than the clamping force we can withstand when clamping in a larger area.
The line shown in the cut can make the fixture turn off without turning it into a cone.
Tip: Don\'t cut too far!
Centered in the middle of the tab, it is enough to cut the cut line of one quarter of the circumference to 1 out of 3.
If you cut too far, the clip will be over-weakened.
Use the angle grinder with a thin cutting wheel carefully (
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