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glass blowing pipes tutorial

Glass blowing pipes tutorial

Attach your blowhose assembly to one tube.

Seal the second tube with a cork or use a test tube bottom from the previous lesson.

Light your torch and adjust the flame.

Rotate both ends of the glass tubing (as if fire polishing) in the flame. They should be close, but not yet touching.

When the tube ends are red hot, remove both from the flame, stop rotating, and push the tubes together, making contact all around. If the tubes are not well aligned, you may need to start over.

Place the sealed area back in the flame, concentrated directly on the seal, and then rotate and blow, maintaining ID and OD, to work the initial seam/line into one continuous piece of glass.

Anneal. Remember, a glassblowing job is never complete until the glassware is annealed!

Check your work – roll the final piece on a flat surface and ensure there is no wobble and that no section of the joined tubes ever leaves the ground.

Option #2 – Stationary Method

    This option does not require rotation. It does require the glassblower to hold and manipulate the torch around a glass tube that is held stationary in a standard laboratory ring stand:

    Clamp tube #1 vertically in a ring stand. The end of the tube should be about chin high. Attach the blow hose to the bottom of the piece.

Adjust the torch to a sharp flame and hold it one hand. Hold tube #2 in your other hand. Tube #2 should be sealed or stoppered.

Sweep the flame back and forth across the end of tube #1, concentrating on the back half of the tube.

At the same time, hold tube #2 above tube #1 at a slight angle and heat it simultaneously as in step 3.

Bring tube #2 down, contacting the back of tube #1 first, and continue to sweep the flame back and forth across the tube ends.

Continue to bring tube #2 down onto tube #1, making complete contact around the circumference. With practice, steps 5 and 6 are completed in a quick, smooth, continuous motion. If the tubes are not well aligned, you may need to start over.

Using a small sharp flame, work out the seal by heating small sections of the seal at a time.

Anneal. Remember, a glassblowing job is never complete until the glassware is annealed!

Check your work – roll the final piece on a flat surface and ensure there is no wobble and that no section of the joined tubes ever leaves the ground.

Tutorial Lesson 11, Butt Seals
Lesson 10
(Making a Test Tube)
Lesson 12
(T Seals)

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Page 11 of a 17 page introduction to basic scientific glassblowing techniques at The Scientific Glassblowing Learning Center