Building a Fume Hood

Gallery, Projects and General > Project Logs

<< < (5/7) > >>

S. Heslop:

--- Quote from: PekkaNF on September 12, 2016, 07:52:35 AM ---I have yo agree with Mick. Most of the stuff on YT is executed with reckless abandon and lack of skill is replaced with bravado.

Anyways, I would not be too worried about too much suction. For any kind of decent draught you need whole lot of flow. You probably will be blowing the exhaust up on the roof (no point of expelling it inside), ducting will take cause some loss on efficiency.

You probably need some curtain or something on the opening to restrict the opening size ot there probably will be not enough of flow to suck all obnoxous stuff out. Also a little glass barrier on the front might be a good idea, some airborne material has tendency to descend. But you probably allready know all of this.

http://www.cibsejournal.com/wp-content/themes/cibsejournal/images/2013-10/images/fig-1.png

Pekka

--- End quote ---

I've got plans for an adjustable sash. I just bought the glass today, in fact. It's not tempered so theres a potential hazard there. But it's extremely heavy at 6mm thick. I kinda forgot how heavy glass can be. The plan for counter weights was to hide them inside the sides of the cabinet but there's nowhwere near enough space to actually balance the glass. Plus the whole thing would become quite front heavy even if I could. There's also not enough travel for a pulley system.

I've built the cabinet around an imaginary garage layout, containing a larger lathe and a bridgeport mill that don't exist, so i'm hesitant to extend the cabinet forwards any further. I could maybe dangle weights off the side but that would look silly. Or I could fit weights into the space below with a really elaborate pulley system to reach them. Or maybe I could fit some long springs inside the arms and a system to lock then sash at any position. I guess theres alot of things I could do.

raynerd:
You just going to extract or filter as well? I know ours go through a simple carbon filter first.

S. Heslop:
I've been thinking about maybe making it go through a tank i'd mostly keep empty, but can be filled with water to bubble though. But I bet that'd cause a big mess. And with the glass and counterweights i'm starting to get concerned about how top heavy the thing is. I'm planning to put some cupboards up along the wall next to the fume hood so maybe I could stick something there and just duct it in.

S. Heslop:
Today I learned that it's impossible to cut the corners off of glass using the score method. I wrecked one of the side windows trying to do exactly that, and kept trying on the ever smaller pieces remaining. The glass just wants to skip to the edge as soon as it becomes more favourable for it to go that way than following the score, which I should've realised sooner.

I might try getting some diamond wheels for my rotary tool. It's got one of those wands so that'd help keep the coolant water away from any mains electrics.

S. Heslop:
Dang garage flooded again so there's not alot I can do while waiting for it to dry. Glad I woke up in the middle of the night just before it started raining to get all the important stuff off the floor.

Navigation

 Message Index

Go to full version