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-   -   Blow and cap (http://talk.craftweb.com/showthread.php?t=12445)

Franklin Sankar 10-11-2019 09:18 AM

Blow and cap
 
I never got the blow and cap method to work for me. My blow hose works well . Whatís the secrete of the blow and cap?
Franklin

Shawn Everette 10-11-2019 10:19 AM

Practice. You want a good amount of pressure in the pipe and your thumb ready to go. Try it on a cold plugged pipe, if you hear air move when you take your thumb away you did it right.

Pete VanderLaan 10-11-2019 11:34 AM

I would think that doing that with a hose was going to really require a good deal more pressure than just doing it with a blowpipe. Is that bad thinking?

Warren Trefz 10-11-2019 11:43 AM

Have the bottom part of you thumb pad resting on the mouthpiece almost covering the opening completely, so that you can easily seal it off, and then place the mouthpiece and positioned thumb in your mouth from the side. Blow and seal off the pipe while you are blowing. Should look sort of like you are playing a flute but with a thumb in you mouth also. As Shawn said practice on a clogged pipe by getting it hot and try capping. Hold it up to your ear and uncap it and if you hear a pop you had it sealed. When you start capping with molten glass it does not take a lot of pressure, the heat will do the work for you. If you are blowing bottle glass, which if I remember you are, it will take a bit more pressure for the capping puff. But heat does wonders.

Shawn Everette 10-11-2019 11:43 AM

You cant exactly do it with the hose. Blow, cap, bubble, then hose.

Rich Simmons 10-11-2019 02:10 PM

Try this Video -
https://www.glassblowersguide.com/bl...pping-a-bubble

I've never met Nikolaj Christensen, but I like his explanation.

Shawn Everette 10-11-2019 02:34 PM

Ugg, fat derlin mouthpieces.

David Russell 10-11-2019 03:54 PM

When I learned I found it helpful to excessively overdue the amount of air being blown before capping.

Franklin Sankar 10-11-2019 09:43 PM

Great video. He can teach well.
Thanks
Franklin

Eben Horton 10-12-2019 07:35 PM

Practice on a clogged pipe. Release the air near your ear to know if you got it right. The more you practice the easier it gets.

Franklin Sankar 10-13-2019 08:25 AM

Thanks for the replies. I will just have to practice much more. I blow and build up the pressure in the pipe but my seal seem to be weak so the air leaks out.
Blow hose works so good why more people donít use it?

Franklin

Eben Horton 10-13-2019 09:32 AM

Quote:

Originally Posted by Franklin Sankar (Post 145525)
Thanks for the replies. I will just have to practice much more. I blow and build up the pressure in the pipe but my seal seem to be weak so the air leaks out.
Blow hose works so good why more people donít use it?

Franklin

I use a hose all the time but never to start a bubble. Reason being that I put my starter bubble in when the glass is far too cold to put one in with a hose. The result is that I get perfect starter bubbles that are straight.

Pete VanderLaan 10-13-2019 01:39 PM

I prefer blowing into a round bowl on the floor lined with paper. I wander around a lot and don't like the hose. Not unlike the dog that can wrap its leash entirely around a single bush in a field.

Franklin Sankar 10-13-2019 07:25 PM

Eben by cold you mean after you maver and form a skin? And the inside still hot? If the glass get too cold why donít you give it a little reheat. Can reheat replace your blow and cap step?

Franklin

Eben Horton 10-13-2019 07:32 PM

Quote:

Originally Posted by Franklin Sankar (Post 145529)
Eben by cold you mean after you maver and form a skin? And the inside still hot? If the glass get too cold why donít you give it a little reheat. Can reheat replace your blow and cap step?

Franklin

Yeah mon. Cold skin. Hot core

Franklin Sankar 10-13-2019 07:49 PM

So reheat until I can cap and blow?
Franklin

Eben Horton 10-13-2019 08:01 PM

Quote:

Originally Posted by Franklin Sankar (Post 145532)
So reheat until I can cap and blow?
Franklin

That reverses the temps. You gather, block or marver for a bit and then cap and blow all from your gather heat. Again.. practice on a clogged pipe and it will all make sense. When I was 15 I took a pipe home and sat down in front of the tv and practiced cap and blowing while watching the Simpsons. DOH!

Franklin Sankar 10-13-2019 08:52 PM

Thanks for the explanation. I was blowing like hell and the blow hose used to pop out. Yes it makes sense now.
Franklin

Art Freas 10-14-2019 01:01 AM

Also it is very difficult if you heat shallow, you need some heat down in the pipe for it to work.

Franklin Sankar 10-14-2019 07:26 PM

Thanks
Franklin

Franklin Sankar 11-07-2019 09:45 PM

How hard do you blow.?
Franklin

Scott Dunahee 11-07-2019 11:32 PM

when I taught classes, I would put a squishy foam (disposable) earplug in the business end of a cold blowpipe. Then I had the students practice blow and cap over and over again until they could hear a consistent pssh when they released their thumb from the blowpipe near their ear. No noise, you didn't do it right. Rinse and repeat. Your furnace doesn't even have to be on for this one.

:)

BSD

Franklin Sankar 11-08-2019 06:05 AM

Thanks Scott. I plugged the end of my pipe with a wooden dowel. Wil try the ear plug. I am doing it much better now but to guarantee a pssssfff sound I blow hard.
Franklin


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