Term for this type of metal tube to fitting?


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Old 12-29-21, 10:56 AM
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Term for this type of metal tube to fitting?

Sorry I don't have a picture - I should have taken one previously.

I modified a snare drum stand to make it lower. In the pic here you see the tubing goes into that fitting.

When I got the fitting off, the end of the tubing had maybe 3/4" of grit on the end which I assumed is what worked to make a super tight fit into the fitting.

Now that I cut away the top portion the fitting isn't as tight.

Is there a way to add some grit to the outside diameter of the metal tubing to get a snug fit into the fitting?

What is that method of gritting the of a pipe for fitting called?

Thanks!


 
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Old 12-29-21, 12:11 PM
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I would think a knurling tool would work.
 
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Old 12-29-21, 12:59 PM
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I would use a knurling tool but it is most often used in a lathe so you can apply a good bit of pressure while the part is rotated under the tool. You can also use a center punch and make a series of dimples in the area you want more grip. Another thing to try is a small piece of sandpaper between the two parts.

Do not sand. Yes, it will make the surface rougher but because it removes material it makes the tubing smaller which can make it more difficult to grab.
 
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Old 12-29-21, 01:39 PM
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Yeah, I don't want to take material off, agree.

I'll think about a punch.

Can't get it on a lathe cause I can't get the tube out of the bracket with the legs.

Would a knurling tool not take material off? Would it raise the existing OD and is there a knurling bit that can be used on a hand drill?
 
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Old 12-29-21, 01:44 PM
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It would be debatable if a knurling the pipe would accomplish what you want.
Do you tighten the knob and the clamp is drawn tight or is there still a gap ?
Can you post a picture of the knob side of the stand ?
 
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Old 12-29-21, 05:12 PM
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PJ what do you mean knob side?

The other part of the stand - smaller OD - passes through the fitting into the pipe (bottom portion of stand shown in picture) and the wing nut on the other side of the fitting locks the smaller OD part of the stand in place. That has no effect on the tightness of the fitting on the tube that I cut.

Right now I can just pull the top part of the stand off and the fitting will come with it.
 
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Old 12-30-21, 05:39 AM
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Would a knurling tool not take material off?
A knurling tool raises the surface of the metal like the handle of some tools.

Depending on how much gap you can get you might be able to make a very thin sleeve out of metal, google shim stock, it's like thick aluminum foil. That might be work to fill the gap and allow the clamp, whatever that is, to provide greater clamp load.
 
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Old 12-30-21, 12:34 PM
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Maybe you could drill and tap it for a bolt to tighten against the pipe. Or maybe drill it and put in a rivet.
 
 

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