Thread: My time to build a dust system

Originally Posted by The Hun

Questions This is my 2 cents

Are Y intersections much better than T intersections? Yes, Tees are the worst fitting for airflow

How do you cut into 150mm pvc pipe neatly to join pipe without fittings? (this was suggested in a thread recently?) When making transitions part of the process involves a plan (drawing) which will have the hole marked out, these can be quite weird shapes, the drawing can be laid on the flat sheet, marked out then folded, as you already have the rolled up section (pipe) the plan can be wrapped around the pipe and then the hole marked on the pipe, If you know someone who is a sheety maybe they might draw a plan for you? Alternatively, if you hold the pipe without moving it (say 100mm up to say the 150mm) pipe at the angle and position you want it then using a rule held parallel on the outside of the 100 project a series of straight lines down onto 150 this then marks out the hole for you once you join the dots, you can improve your chances if you cut the 100 at say 45° or whatever the angle you want and then hold that onto the 150, that gives you 2 points of the hole, further to that continue cutting the 100 to follow the curve of the 150 and if you keep cutting away at the 100 you can eventually get it to meet the 150 all the way round, then you can mark this on the 150 as the hole to cut out, if you have a lot to do make a plan of both the 100 and 150 (wrap a sheet of paper around the pipes and mark the end and the hole)

Does the super dust deputy improve the fine dust performance much? This may be a factor to enclose the filter or not? Dont know

Is a 100mm by 200mm (4 bricks) vent adequate for the filter to exhaust out through the brick wall. 100x200 is a larger area than the 150 pipe area so should be OK

Are dust hoods effective eg for disk sanders and mitre saws? I'd say yes, depends a lot on the actual design of the hood tho

Many thanks for any advice

Regards

Peter

Pete

This may help..

Pipe Joint Template

That sort of comp. program is what a sheety will have, and for anybody doing any DE ducting work it would be quite handy Chris, but at $359 pencil and paper will do me fine.


Pete

The evaluation version is fully usable except for printing I have been told.

You seem to be on the right track but before spending any more money you need to decide if you are serious about capturing as much of the invisibles at source or not.

If you are serious about invisibles then almost all things like dust deputies, chip collectors and small home made cyclones work against collecting the really fine dust. They rob valuable pressure ( ie around 1/2 to 1/3rd of the available pressure generated by a small DC) from systems that is better spent on collecting more air and invisible dust. That is why BP spent so much time designing his cyclone so they have a low pressure drop.

In almost all small systems there is always a trade off between collecting more air and invisibles and keeping bags clean. If you want to be sure about collecting as much of the invisibles as possible then learn to keep bags clean and leave out the chip collectors. If you are lazy and hate cleaning bags then eventually the bags will clog so much that you might be better off using a chip collector.

Originally Posted by The Hun

Questions

Are Y intersections much better than T intersections?

Yes - significantly better.
I would also avoid using 90º sewer pipe bends as the steal pressure, at a minimum use 2 x 45º.

How do you cut into 150mm pvc pipe neatly to join pipe without fittings? (this was suggested in a thread recently?)

It's possible but I reckon it's not worth it for the same size pipe. It is a little easier for 100 mm into 150 mm but the available 150 mm Y's with 100 mm take-offs will generate less resistance than most home made junctions.

Does the super dust deputy improve the fine dust performance much? This may be a factor to enclose the filter or not?

See my previous post.

Is a 100mm by 200mm (4 bricks) vent adequate for the filter to exhaust out through the brick wall.

I would go for double the area of the 150 mm duct, so 35000 mm^2
How tortuous is the path to the opening? Any 90º bends?

Are dust hoods effective eg for disk sanders and mitre saws?

Hoods help with chip collection but rapidly disperse air flow hence provide some back pressure and reduce flow. More important than a hood is getting the dust collection point as close as possible to the dust generation point. Hoods may get in the way of being able to do this This may mean moving the dust collecting port as required - I am working on such a system for my lathe.

Remember while the chips that fly around look untidy they will not affect your health so don't worry about them and think about what the invisibles are doing.

Originally Posted by Chris Parks

The evaluation version is fully usable except for printing I have been told.

Yes, I read that in the blurb, there is one default pipe joint scenario (@53°) that is printable which allows you to test/scale your printer so the drawing fits the actual pipe but other than that you gotta buy it


Pete

I have the Super Dust Deputy and would advise using it every time rather than not. I have even used it with a 1 hp extractor with very good results. With 2 HP or more, you will not have any issues with pressure drop due to the cyclone itself. Having a pleated filter further improves performance because of its much larger surface area than bags which clog quickly.

Like all good cyclones, most of the fine dust is removed before it reaches the filter, which now rarely needs tending to thanks to the Super Dust Deputy.

In terms of pipe sizes, I removed the Y connector from the blower and use 5" hose to the machines, with relevant adapters being used at the machine end. Between the SDD and the blower, I also use 5" hose with a suitable adapter on the SDD.