Gallery, Projects and General > How do I??

gas jet

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bogstandard:
John,

Just to add a little.

A bit of info on burner designs.

See C-o-C.

There are basically some standard bits to the burner designs.
The jet is mounted so that it can be moved fwds/bwds in the air inlet area. This allows the mixing and velocity of the gas to be set up to give optimum performance. You will need to play about with jet sizes to find the correct one.

In the ceramic design, you play around with the position of the upstand (I used 1/4" diam brass bar). The bar is there for the gas to impinge upon and distribute the gas to all areas of the burner. Without it you will find that on a longish burner you will get uneven burn across the surface.

On the poker type, play around with sizes and positions of slitting saw cuts. It all depends on how long you need the burner to be. Using a dremel and one of the very small saws that you can get for them is a good starting point. After you have got it burning correctly, use that as a pattern to make the finished article.

I have seen gas poker designs that use a very fine metal mesh wrapped around a tube that has holes in the top surface of the tube. I have never played about with them, but they do seem to work fairly well, more of a burn along the surface rather than a jet effect.

I hope that this has been of some use.

John

Stilldrillin:
Very nice vid!  :thumbup:

I`ve done a lot of cnc peck drilling in my time, smallest dia 1/8".

He looked a little nonchalent with the pinvice. Two hands would have been more stable.....  :scratch:

sbwhart:
Wow I'd never had thought of drilling that small free hand very impresive  :clap: :clap: :clap:

Cheers

Stew

J. Tranter:
Thank you Bogstandard the C-o-C makes perfect sense now. I am going to try the poker type burners.
Now one last question. Where can I get drill bits that small?
Thank you all again
John Tranter

bogstandard:
Hi John,

I had a quick look at US sites and found these very expensive metric ones, they go from 0.3mm (0.012") upwards, and should give you the range you require. The Imperial 61 to 80 number sizes might do just as well, but a lot more expensive.

https://www.micro-tools.com/store/item_detail.aspx?ItemCode=82615MD

I would try the 0.3mm to 0.5mm range for starters. Start off small, then open out to the next size up, it is easy to take metal out of a hole, bit more difficult to put it back in. Of course these starting points depend on how big your burner is.

Drill most of the way thru the jet with a larger drill, then finish off the last bit with the smaller one.


Have fun

John

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