31A – Fume Pre Filters Design Mk2 (12:58)

The Lightblade Learning Lab with Russ Sadler

The Lightblade Learning Lab is a series of videos that Russ did for Thinklaser Limited based on using the Lightblade 4060 Laser Cutting and Engraving Machine. Thinklasers Lightblade 4060 has a 400 x 600mm bed size and was supplied with a 60W EFR laser tube. In this session, Russ takes another look at pre filters and brings out a Mark 2 Version.

Fume Pre Filters Mark 2
Fume Pre Filters Mark 2

Contents

  • Looking at how much dust is collected on the Mark 1 filter unit (see previous video).
  • (The Mark 2 filter increases the filter area by more than 30%)
  • Use of WC123 PETG Weld Cement for assembling acrylic.
  • Assembling and gluing the new filter unit using masking tape.
  • Mark 2 Design of Pre-Filter in DXF format
  • Cutting the wadding/filter material.
  • Fitting the material and locking in the front cover.
  • Fitting the unit into the machine.

My thanks go out to Tom at Thinklaser for giving permission to embed these videos on this site. If you are looking for a new laser machine from a quality supplier, then I would suggest you check out their website: www.thinklaser.com.

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Video Resource Files for Fume Pre Filters Design Mk2

Prefilter Mk 2

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External Resource Links for Fume Pre Filters Design Mk2

www.thinklaser.com

www.rdworkslab.com

What can a laser cutter cut?

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Transcript for Fume Pre Filters Design Mk2

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0:16Now here’s my filter mark 1 and you can see from the colour of the wadding

0:22that’s around the edge here just how much rubbish it collects. It collects a

0:30lot of dust on the surface here that you can see it just brushing off all right

0:36so I’ve increased the area by probably 30% in fact I’ve increased the area more

0:43than that because there’s a bigger open area on the new filter. Well the machine

0:48will now become an assembly station for at least part of this assembly I’m going

0:53to be using this WC 1 2 3 PETG weld cement. Now although it’s

0:58designed for PETG it works very well with acrylic just takes a little

1:03bit longer to cure off so sometimes we have to wait maybe thirty Seconds to a

1:08minute to get it to, get it to go off. So we’ll produce the pieces out of a hat

1:14as we go and the first two pieces we’re going to assemble are these two pieces

1:19here which are the locators that go into the the air spout at the back. So we put

1:26those together and this has to go together a certain way so bottom right

1:33hand corner and then we’re going to poke these through it like that now I happen

1:39to have a 14 millimeter block of acrylic here which is just the right height to

1:43keep this level. So the idea is what we’re going to do is we’re just going to

1:46put a little bit of glue into each one of these joints

1:53and we should see it running in the joint as we put it in and we don’t have

1:58to worry too much about the excess on the surface because this is a frosted

2:01material and it doesn’t really show but we will wipe the excess off and then

Transcript for Fume Pre Filters Design Mk2 (Cont…)

2:07we’ll just lean on these for about a minute. Now while we are we doing that we may

2:12as well put a little bit up here as well

2:24just move it around from time to time to make sure it’s not stuck today to the

2:29work table. Now it’s very convenient that these blocks also when I rotate them

2:34around they sit a little bit taller than that which is what we need as well

2:41because we’re going to turn this over now. Now what we’re going to perform now

2:45is a bit of a tricky operation so you’ll need some masking tape and youneed to do a

2:50little bit of preparation work. Tear up a piece about four inches long and on

2:57these pieces with holes in

3:02we’ll put a piece on each end. These pieces here with the lugs on are going

3:10to go upwards and you will see that there are matching holes

3:17in these pieces. So plug the corner together and hold it together with tape

3:25like that now it’s starting to be a little bit more stable. We can do the

3:30same with this one and then finally we can do this one, we don’t need to do the

3:37tape up too tight at the moment we still need some flexibility in here because

3:43we’ve now got to squeeze this one into this other set of holes. So we can pull

3:52the ends, pull the large sides away to start with and tuck these into the slots

4:02on the end

Transcript for Fume Pre Filters Design Mk2 (Cont…)

4:05and then we can try and do the same on the other end but we’ll have to push

4:11the sides out

4:16like that

4:19and then click these in these. There we go so now we can have a go holding the

4:26corners a little bit tighter squeeze the tape up

4:32and that’s our basic assembly done so now we’ve got to glue it now we need a piece

4:39of scrap material six millimeter thick underneath this bottom face here so that

4:46we can press down on the top here without putting any strain on these

4:51joints of the corners we’ll take the load directly down onto this flat

4:54surface. Because what we’re now going to do is we’re going to put glue in these

4:58little spots along here and we’re going to stick these down tack the whole thing

5:03together so

5:17you’ll see the glue

5:20running into the joint as you tuck it into the end of these

5:43there we go, just wipe the excess off as we take two or three minutes and hold

5:50the whole assembly together. This is the right way up with this at the bottom

5:55right hand corner okay when I let go I want to make sure that these dark

5:58patches which are along here where the gluing goes doesn’t change shape which

Transcript for Fume Pre Filters Design Mk2 (Cont…)

6:03means it has actually locked

6:07okay now we can carefully turn it over 180 degrees and we can do the other side

6:14exactly the same the other long side

6:18there we go that looks stable now we’re going to turn it through 90 degrees

6:27I might have to just peel the tape back a little bit from some of the tabs

6:33and then the other end

6:47okay now we’ve tapped it together now we’ll put our blocks back on here again

6:53and now that that’s sitting upright we’ll go round and we’ll just run a bead

6:58of glue

7:16along the edges there and that will secure that in a few minutes we can then

7:24turn it over and

7:32we do exactly the same thing

7:38so we just leave that to dry for about ten minutes now while that’s drying off

7:44I’m using a piece of let’s call it scrap acrylic it’s a funny color blue which

7:51I’m unlikely to use you could use a piece of MDF piece of cardboard even

7:57corrugated cardboard so what we’re doing we’re making a template so that we can

Transcript for Fume Pre Filters Design Mk2 (Cont…)

8:02mark the wadding to cut it to go into the filter now here’s the wadding you

8:07can see you get a lot for very little there’s probably enough there to do four

8:11or five filters and that cost probably I think about three or four pounds trust

8:17me you need a template because it’s got a mind of its own now what I’m going to

8:23try and do is to cut this in one piece and fold it in half now I would advise

8:28you to use these rather than a Stanley knife because yeah it it tends to rip

8:35okay so there’s our filter material well here we are back with our blocks on the

8:43table again for the final part of the assembly now here’s our piece of

8:48polyester wadding that

8:53fits in there quite nicely

8:59it’s a little bit too full which is great because it means it’s going to

9:03fluff itself up and sit tight against the front cover and here is the front

9:10cover bear in mind we’ve got a plug here at

9:13the bottom right hand corner and these pieces here which are the funny shaped

9:18slots sit at the top but before you attempt to

9:21put those in thread these little pieces at the bottom in and just catch them

9:28under the lugs and then you can push the top down over those and from the top you

9:37should be able to just slide it underneath the tabs like that. That’s how

9:41easy it is to assemble and disassemble let’s just do that again we can just

9:46push it up and the whole thing comes off we need to tuck these little bottom

9:52corners in first one material thickness then we can push the top in put a bit of

10:00pressure on it and pull the whole thing down and it locks down nicely there is a

Transcript for Fume Pre Filters Design Mk2 (Cont…)

10:06chance that you can knock this and lift it off during assembly so here we’ve got

10:12a couple of little T type t tape so here we’ve got a couple of little t-shaped

10:17tabs that will slip in there like that and they will prevent this from coming

10:24apart so they will just lock the whole

10:28assembly together now the smaller one that I had before was very easy to get

10:32into the machine this one is a bit more like a Chinese puzzle you have to

10:37thread it in very carefully now we shall need both the front and the side doors

10:42open now we’re going to lay it down let me see how does it go I don’t think I’m

10:49going this way, let me just check

11:05oh yeah now that I’ve made it smaller, slightly, it goes in the side door hopefully

11:11there’s just enough light in there

11:16for you to see that what we do is to lift it up and we just offer it into the extract

11:25spout and just in front of that spout we’ll just push it in and it clips in so

11:31there we are it’s sitting in the back of the machine it’s a very large area because

11:35the principle of any pre-filter is to keep the air velocity as low as possible

11:42as it passes through the filter so you need the largest area possible and the

11:47freest flow now the flow might be free through that

11:52Wadding but it’s a very very tortuous path for any particle of sticky stuff or

11:58dust to try and get through that wadding it’s offering no extra resistance to

Transcript for Fume Pre Filters Design Mk2 (Cont…)

12:03flow to the Purex unit

12:09it’s doing what it always does hovering around about the 310

12:17well hopefully that simple device a lot lot cheaper to replace than this rather

12:24expensive bag filter so it should hopefully prolong the life of this

12:28filter quite a lot I’ve had one of these in my machine now for over a year I

12:33don’t use it a great deal but hey you saw the state of the filter when I took

12:39it out of this machine that’s about the third filter that I’ve had on this

12:44machine and every time I’ve taken it off it’s been as dirty and as mucky as that

12:49so it’s doing a very good job so I hope it works well for your application and

12:55thanks again for your attention

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Last updated August 26, 2021

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