Thread: Cabinet for Makita scms

Not the same saw but it may give you ideas....

Dust Hood For Bosch Glide Saw

Thanks Chris. Your design was the one I was hoping to emulate due to its extraction capability however your saw doesn't have the problem of the extended travel towards the rear that the Makita has or its unwieldy arc from side to side.
The rear end of the Makita moves backwards 400mm and swings through an arc that means it needs 1060mm travel from side to side.
I'm looking for a way to modify your design but in a way that it does not dominate the workshop

May be you can cut a slit to let the arm protrude out the back. Cover the slit with a rubber strip to minimises air leakage. Alternatively buy a Bosch glide and you will definitely need a hood.

Have a look at Machine Bellows. They can telescope in and out and move sideways to some extent.

Pete

Originally Posted by justonething

May be you can cut a slit to let the arm protrude out the back. Cover the slit with a rubber strip to minimises air leakage. Alternatively buy a Bosch glide and you will definitely need a hood.

The slot is definately up there on the methods to look at. My only concern was the disruption to the extraction "chimney" at the back of the enclosure that Chris uses.

Lappa, - here's what I came up with after a lot of research on here.
It is not perfect, but it does only let the dust come out of the front, mainly from in front of the fence.
Curtains / flexible doors on each side at the front + improved dust collection is next on the to do list.Paint Copy 067.jpgPaint Copy 068.jpgPaint Copy 069.jpgPaint Copy 070.jpgPaint Copy 071.jpgPaint Copy 072.jpg

Regards

Alan

Using the heavy duty rubber strip should help to seal the slot sufficiently.

Alan - thanks. What model Makita do you have? How deep is the cabinet? Your setup looks like Chris's which is the unit I was hoping to model mine on. I'll probably do similar and mock up and trial before committing to a design. My main problem is limited space so I don't want the cabinet to dominate but maybe I'll have to live with it.
At the moment it's on a Makita trolley but it takes up too much room and dust extraction is crap.

Justonething. While the slit rubber was my first choice, looking at the problem again, the saw is still going to go way back no matter whether it's in a cabinet or passing through slit rubber - 400mm is 400 mm so maybe a cabinet is easier?
Thanks for the input.

What dust extractor are you using? The bottom pick up/top extraction may not work on an extractor that is less capable and you may need to use a bottom mounted duct if that is the case. I am driving mine with a Clearvue so it works for me as that flows plenty of air but not everyone has one of those unfortunately

This commercial hood may give you another idea ChopShop Saw Hood - FastCap - Woodworking Tools

I think, like a cabinet saw, the efficiency of air flow INSIDE the enclosure for a miter saw is less important than arranging for air to enter through a narrow front opening and exit via the dust extractor plumbing.

I should prefix my comments by saying I have never built a hood for such a saw but the committee at the mens shed did ask me to look at dust control for the Makita SCMS at the mens shed, which is mounted on a long narrow movable bench and almost always used outside. I did briefly look at the saw, and as Lappa indicates, the size of the cabinet needed to control the dust from that saw is a bit of a problem and so that I did not have to think about it too hard for too long and to avoid more work I just recommended to the committee that it continue to be used outside.

None the less here is a summary of at the 5 minutes of thought I gave the problem at the time.

Like most WW machines dust control on a SCMS involves controlling chips and fine dust. To control chips requires high speed air while fine dust requires large volume flow.

The fine dust will move with the air currents which initially moves with the air currents generated by the blade and then because the dust is slightly warmed by the cutting process it will rapidly rise. Some of this dust will be scattered by the various parts of the saw but most of it moves behind and above the saw. As CP has in his setup, this dust is best collected behind and above the level of the saw.

Apart from the chips scattered by parts of the saw, they typically fall behind the saw, so again, as CP has in his setup these are best collected by a low down collection point.

To pull forward scattered chips back into the hood is a big ask. If the front of the hood has an opening of 600 x 900 mm ( 2 x 3 ft) and a 6" Duct with a nominal 1200 CFM DC generates an air speed of only 200 FPM. This is usually insufficient to hold most forward scattered chips in the cabinet and luckily they usually represent a small proportion of the chips.

So two collection points are needed and CP has done this with a powerful DC and demonstrated that it works.

However, as CP indicates, small DCs struggle to collect efficiently from one collection point let alone 2, so they will struggle to control both fines and chips

Because most WW focus on what they can see they tend to focus on collecting chips, they naturally set up for chip collection such as shown by little boxes post. However if you are worried more about dust from a health perspective then folks with smaller DCs should probably forget about chips and concentrate on collecting the fine dust.

Just as critical for small DCs will be the efficiency of air collection which is where a BMH will really help.

The location of the BMH should be in line with where the air speeds coming away from the saw are the highest so the first thing I would do is use an air flow meter and 3D map the air speed around the saw.*
Once the line of greatest air speed is found, place a BMH as close as possible to the saw and make sure the orientation of the BMH is perpendicular to the line so that it will collect the most dust. Then build the cabinet so that it constricts the chip scatter and funnels the air towards the BMH.

* because this is taking place outside a duct a propellor based air flow meter can be used to do this measurement.

This is what I came up with, my Aldi SCMS is similar in rear length and sweep dimensions.

The finished picture shows what it looks like in everyday use. The drawers are great as apart from the fact they are good for storage, they add weight to the unit and lessen any movement with large material hanging over both sides.

This SCMS has a 34cm cut, so it is quite long. The reason for the odd shape is a mistake when working out box measurements. I worked everything out wonderfully, so well that when doing a 45º cut everything fitted in perfectly. It was only after I had built the drawer cabinet and placed the saw on the top, I became aware of a major shortcoming. Doing a 45º cut at 45º, requires the saw to lean over that bit more, hence the side extensions hanging over the drawer base.

I run a big gulp (I think that is what it's called) at the rear, which runs into a cyclone unit powered by a 1400W vacuum system. It works a treat and with everything on wheels, it is simply a matter of wheeling it to wherever.

An added feature that I wouldn't be without, is the power board, which was from Aldi and meant for tradies. With the saw and the vacuum plugged in, I flick the power board switch and the vacuum starts and the saw is given power. I just use the saw as required and when finished I switch off and the vacuum stops.

Mick.

SCMS_mobile_station.jpg

IMG_8259_SCMS_09.jpg

Thanks Optimark - it looks the goods
Could you give me the dimensions of the base cabinet please and a side picture of the assembly? Need to see if I can fit it into my allocated space.

Cheers

Will do, but tomorrow afternoon/evening as I am unable to do measurements at the moment.

Here is where you will see more of the build and the just completed product.

SCMS dust extraction

I'll measure mine up tomorrow. What measurements are important? Suppose all are, but you never know.

Mick.