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Down Draft

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CNCCAJUN
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Down Draft

Postby CNCCAJUN » Tue Oct 28, 2014 8:55 pm

I stumbled across something that may be of value to some.

I have a Dynatorch 4X4 XLS with downdraft.

I have found a benefit of a downdraft table I had not considered.

Beyond the fact that my shop has ZERO soot on the white walls I have noticed another benefit.

My exhaust fan is capable of eliminating smoke/soot with the only thing on the table being a piece of metal less than a square foot.

But what caught my attention was when I had the entire table covered with material and started cutting I heard a whistling sound.

It was the air rushing through the newly created kerf.

Long story short it eliminated warping for me when cutting 16 gauge.

I realize you have to have a hefty exhaust fan to this, but now I don't feel like an idiot for buying such a large fan.

Steve :D
Smiling Gator Metal Works, LLC
Dynatorch 4X4 XLS
PowerMAX 85
Baton Rouge, Louisiana

quadboy
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Re: Down Draft

Postby quadboy » Mon Nov 24, 2014 10:59 pm

Wondering what you thinks better down drift or water table?

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_Ogre
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Location: Motown

Re: Down Draft

Postby _Ogre » Wed Nov 26, 2014 1:57 pm

the benefits of covering up the open area on a downdraft table has been mentioned many times

as far as down draft vs water table? it depends on where you are located
i would prefer a downdraft, but up in snow country i'd have to filter and exhaust the air back into the shop
therefor i have a water table
though a water table has less warping from heat and the parts are self cooling :mrgreen:

jim colt has designed a nice filtered return air system for his display/demo table that he also runs production on
bulltear 4x8 cnc plasma table, candcnc bladerunner w/dthc, hypertherm powermax 65, sheetcam, mach3
laser cross hair for hypertherm torch http://www.plasmaspider.com/viewtopic.php?f=6&t=12508
an ogre smiley :mrgreen: how cool!

Dana gear
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Re: Down Draft

Postby Dana gear » Sat Apr 15, 2017 8:59 pm

We run down draft systems on our plasma cutting tables, absolutely no plasma dust . We actually had a water table on one of our earlier units and ended up converting to down draft,. Its a no brainer for us, no water mess , no problems associated with the plasma torch and water/moisture.
No more refilling or cleaning out the swamp, we just pull out the trays and dump them when needed.
There is however a disclaimer we are located in Northern California and in the last 2 years we never had to heat the shop and in the summers its generally dam hot for about 5 months of the year. So in the winter venting the shop air outside is not much of a problem.

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see&see
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Re: Down Draft

Postby see&see » Sun Apr 16, 2017 5:44 pm

My exhaust fan is capable of eliminating smoke/soot with the only thing on the table being a piece of metal less than a square foot.

But what caught my attention was when I had the entire table covered with material and started cutting I heard a whistling sound.

It was the air rushing through the newly created kerf.

Long story short it eliminated warping for me when cutting 16 gauge.

I realize you have to have a hefty exhaust fan to this, but now I don't feel like an idiot for buying such a large fan.


Steve,

Your remarks got my attention because I had the same killer fan experience with my 4 x 4 table. Air whistling! :lol:

The 3100 CFM wall fan pulls from end of the table in with 2 feet of 20" flex tube. As if the fan didn't pull enough there is a 12000 CFM swamp cooler at the end of the shop pushing enough air inside to vent the table without the wall fan operating. The wall fan still turns slowly and the draft louvers open just like it was on. Sometimes I run the cooler without water in the winter and it acts like a normal push vent fan but the only time I need it is cutting on the table and welding in the shop at the same time. We're in a dry climate so evaporative coolers work well in the summer here. I say that, but were at 4 times average percip with 20+ feet of settled packed snow up on the mountain ready to pour down on us and still one storm after another on the way. :?

Over kill on the fan also works well when cutting into square tube as the smoke blows out the end of the tube and into the shop more than over the grates. But with that much air flow it still sucks smoke hanging around the table down into the grates and outside.

I'm currently putting a 5 x 10' Sampson table into a new 5000 sf shop with a 20' ceiling height. I'm putting an 18' Big Ass fan at the ceiling with natural gas reflective heaters along side the fan. Along with another 21,000 CFM 5 HP 480 volt evaporative cooler pushing in and a 7000 CFM wall fan at the end of the table.

The downside to all this airflow in the winter of course is the huge heat loss. We have waste oil heaters in both shops now so that takes most of the sting out of high natural gas expense.

Couple picts of the 4 x 4 table with the fan baffle on the end of the caster waste valet cart.

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PlasmaCam DHC2 4 x 4 & Sampson 510 Snap 'n Cut w/Safety Switch Interface Hypertherm 85 & 45XP

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see&see
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Re: Down Draft

Postby see&see » Sun Jun 25, 2017 12:06 am

Just got done installing the 21,000 CFM table pusher fan & evaporative cooler for the 5 x 10 table. It was 99 degrees outside today and it brought the shop and offices down to about 75 degrees in a couple of hours. The shop was 88 degrees yesterday at 4 PM, way too hot to get any productive work done.

You do not have access to download this dxf file.
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PlasmaCam DHC2 4 x 4 & Sampson 510 Snap 'n Cut w/Safety Switch Interface Hypertherm 85 & 45XP


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