Thread: Idea for Carbatec 2.75HP DC Modification / Ducting Layout for Feedback

Rocking blast gates are simple to make, can't clog and somewhere in this forum Bob spplied all the information for them. The big plus is they can with a bit of organisation be operated remotely by cords and pulleys.

Have a look here Blast gate gallery (woodworkforums.com)

Bob's installation in a men's shed showing overhead operation of rocking BG's

DRAFT Ducting Recommendations

Do a search for his plans in this forum

of course some people are too humble to mention Auto Blast Gates PTY LTD

Originally Posted by Tonyz

of course some people are too humble to mention Auto Blast Gates PTY LTD

I assume this company is run by someone on this forum.
They look awesome, but way more that what I need at present.

Originally Posted by Chris Parks

Rocking blast gates are simple to make, can't clog and somewhere in this forum Bob spplied all the information for them. The big plus is they can with a bit of organisation be operated remotely by cords and pulleys.

Have a look here Blast gate gallery (woodworkforums.com)

Bob's installation in a men's shed showing overhead operation of rocking BG's

DRAFT Ducting Recommendations

Do a search for his plans in this forum

OK, so now I'm super keen to make rocking gates.
That totally looks like my scene.
I'll get into some CAD modelling tonight I reckon.

My partner is always teasing that I can't ever just use something available off the shelf... "You have to go custom, don't you mate?"
Looks like I'll be maintaining form throughout my ducting installation.

Originally Posted by mpot

Or make your own out of plywood and PVC.

I made some similar to the ones from Jay Bates (see here) but probably closer to those from the WoodKnight (see here), and they've been working great.

IMG20221024162723.jpg

These are rad too. I assume the hole in the sliding panel is the self cleaning bit.
That makes a lot of sense.


In other news; I asked a member named Ben for details on the cast aluminium gates he used.
They're from the US but they'll ship to Australia.
https://blastgateco.com/Cast-Aluminu...last-Gates.php

I got a quote for the 7" version which works nicely with 150mm DWV.
Came in at USD 49.96 - not that bad if you've got limited shed time but can wait for shipping.
Pretty sure I'll be making mine, though.


Cheers guys.

Hey Kristen, how did this all go?
Could I just confirm, did you find a 14.5" impellor? What unit was this from? Most of these sized units seem to have 12"inch impellors....
thanks Simon

Originally Posted by Kristen

Thanks for your suggestions and comments, fellas.

I was kinda aiming for 1000CFM - I'd have been stoked if I could get that at the table saw / drop saw.
Seems unlikely as I've got ducting layout inspired by MC Escher.
See images...
Attachment 518995 Attachment 518996



I'm a bit overwhelmed by all the variables at the moment, Chris.
Sounds like no matter what I do, I'll be revisiting the system in a year or two.
Might see how I go with trying to get the most out this model with 150mm ducting.



Cheers for the welcome, Colin.
I like the idea of suspending the bags. Any issues with them slipping when they start to fill?


For those following along, here's a few extra bits of info...
- Impeller is 14.5"
- Original duct from impeller to bags is 160 x 116mm (pretty close in sectional area, but I assume rectangular duct isn't as efficient as round)
- I'll be replacing the existing intake port with an MDF Bellmouth Port / PVC fitting

Here's a diagram showing the proposed mods to date.
I'm sure that these will change once I get the unit, but it's a start.

Attachment 518994

that was the last time he posted on this forum. Hope he is still around.

Originally Posted by Tonyz

that was the last time he posted on this forum. Hope he is still around.

Hopefully they didn't get sucked up into the ducting, but completed the project and are living happily ever after.
Cheers Tonyz.

Hey fellas - yep, I'm alive.

I haven't yet completed the full run of ducting, but the section I've done is working well considering how funky the branches needed to be to wiggle through my small shop.

Carbatec said the impeller of this unit is 14.5".

I made a few mods which I can get photos of if you're interested - just let me know.

Plans to complete the rest of the ducting in the coming months.
Been busy trying to fit a house into an urban industrial shed.

Cheerio,
Kristen.

Originally Posted by Kristen

Been busy trying to fit a house into an urban industrial shed.

know the feeling and convincing the council to turn a blind eye.

yes always photos we love perving at dust system photos. what a crazy question....I made a few mods which I can get photos of if you're interested

Originally Posted by Tonyz

know the feeling and convincing the council to turn a blind eye.

yes always photos we love perving at dust system photos. what a crazy question....

I know a few loopholes within the NCC / Town Plan, so I managed to get my Shed/House through council all legit like.
Now I can play on my table saw / drum kit until the wee hours with only my lady friend being inconvenienced.

I'll make a few separate posts for the DC build photos.

Here's the component I made by cutting the original section of duct between the impeller cowl (terminology?) and the wye junction.
I heated the PVC with a chef's burner and knocked the plywood jig in, then reheated and knocked in the spacers.
Worked really well.

Here's the bell mouth port I made to replace the flange that came with the unit.
I laminated a few bits of MDF after profiling them with my trimmer.
Then I used a spoke shave to profile, sanded smooth and painted.

And here's the unit mounted to the wall.

Yet to make the shared overhead duct for the router / table saw.
Yet to make the bench / hood for the drop saw.

The branch the runs to the underside of the router table works great.
Catches everything that goes down there.

The long hose in the last image fits to my benchtop jointer and thicknesser and works perfectly.
I think this is due to them both having in-built turbines, not because of my ducting skills.

Wow, you have been busy. Nice work on shaping that pvc and those bellmouth mods to your blower. Thanks for the pics, giving us all a good perv. Crazy how we start out just wanting to make some stuff with timber, next minute, we're swallowed into the dust extraction rabbit hole.

I was helping a mate make sense of dust extraction this week, he was looking at the various 3HP units. We both asked the various retailers about their impeller size, and that Carbatec model we were told was 12inch.

I noticed a few places where it looks like youve reduced duct size from the main trunk: the table saw and router table; drill press and the nearby drop saw. Wondering if thats because you want to use those tool combos frequently, and avoid blast gate switching? Running the 6 inch all way to each (and using more blast gates) would get you more cfm, I would have thought. Or you could otherwise get three 4inch lines from your 6inch supply line. But im basing this on theory, not practice.

Edit: looking at your pics again, I do see your 3rd wye ready for the overhead table saw, similar spare line over at the DP, so i get it now.