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Author: Subject: Engineering help (drilling a hole in a tube)
Slimy38

posted on 29/4/18 at 09:01 AM Reply With Quote
Engineering help (drilling a hole in a tube)

I'm making a keyboard stand for my daughter, nothing special but I thought it would be a fun project with some leftover metal and fixings. Think 'ironing board legs' but with a keyboard on the top instead of a flat surface.

I need to drill the hole for two legs to be bolted together, but it needs to be in a specific place to ensure the feet and the top bars are parallel to each other. The closest I can think of is using a spirit level to set the tube in a vice so the feet are horizontal, then balance the same spirit level on the tube and see at what point it's touching the metal. But I'm not sure it'll be accurate enough?

Is there a better way to mark the exact point on the tube to know that when I drill through, it's perpendicular to the ends?

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paulc

posted on 29/4/18 at 11:51 AM Reply With Quote
The best trick i've been shown for round tubes is to wrap a piece of paper round the tube.
When the paper lines up with no misallignment between the ends the edge of the paper is square to the center of the tube.

Does that make sense?

Paul

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Angel Acevedo

posted on 29/4/18 at 04:52 PM Reply With Quote
Make a fixture where you can slide the tube in to a stop and a hole where the drill passes through.
HTH





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trextr7monkey

posted on 29/4/18 at 09:43 PM Reply With Quote
Can you hold tube in a milling vice to get angle right?





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Toys2

posted on 29/4/18 at 10:10 PM Reply With Quote
If I understand you correctly, I'd do it like this

Measure the diameter of the tube
Clamp the tube on a flat surface, with the legs vertical
Measure up half the diameter of the tube and scribe a line along the length of the tube

In reality as long as your drill is perp to the legs - assuming that this will be a through hole on both sides of the tube, then a little variation of the actual place that you drill won't be the end of the world

Description
Description

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nick205

posted on 30/4/18 at 08:22 AM Reply With Quote
Appreciate you're using metal stock you already have, but have you not goy any square tube?
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Slimy38

posted on 30/4/18 at 12:06 PM Reply With Quote
quote:
Originally posted by nick205
Appreciate you're using metal stock you already have, but have you not goy any square tube?


The square stock that I have is likely to come in useful. The small amounts of round stock I have are too flimsy to form part of a car, but they'll do fine for a keyboard stand.

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Slimy38

posted on 30/4/18 at 12:06 PM Reply With Quote
quote:
Originally posted by Toys2
If I understand you correctly, I'd do it like this

Measure the diameter of the tube
Clamp the tube on a flat surface, with the legs vertical
Measure up half the diameter of the tube and scribe a line along the length of the tube

In reality as long as your drill is perp to the legs - assuming that this will be a through hole on both sides of the tube, then a little variation of the actual place that you drill won't be the end of the world

Description
Description



Ah yes, that'll do it! Many thanks.

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nick205

posted on 30/4/18 at 01:09 PM Reply With Quote
quote:
Originally posted by Slimy38
quote:
Originally posted by nick205
Appreciate you're using metal stock you already have, but have you not goy any square tube?


The square stock that I have is likely to come in useful. The small amounts of round stock I have are too flimsy to form part of a car, but they'll do fine for a keyboard stand.



Fair point - I've found myself making use of what's at hand before!

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