Dado Dust Collection with OF 1400 on CMS

[rajuliano]

I've just setup my new CMS and dropped my OF 1400 into it. The first task I'm using it for is to plow out some dados. The problem is, it's spewing quite a bit of sawdust towards the outfeed side. It's a spray of dust at the start of the cut, then once the board is covering the cutter, the dust is pushed off the table. I'm using a 1" straight bit. Router speed set to 1. I'm taking out 1/16" on poplar boards about 3.5" wide and 7' long. I understand that little can be done to stop the spray for the initial cut, but once the cutter to covered by the workpiece, I am expecting better DC than what I'm seeing.

I've tried faster and slower feed rates. I've tried plugging my CT22 directly into the router with the D36 hose since the fence DC isn't in play with a dado (I don't think). I've tried changing the ring around the cutter from one that barely clears the bit to one step larger.

Since I'm new to the CMS (and router tables, in general), I'd love any tips you have to share on improving DC when doing dados.

Thanks!

Richard

 

[builderbob]

I think that's the nature of cutting dados. I get similar results when I do the same on my CMS or any other router table I've had over the years.

 

[bkharman]

Here is what i have done... do so at your own risk!  Not necessarily a risk to you, but to your woodwork.

I drop the workpiece onto the routing bit instead of straight plunging it from the infeed side.  If you do this and then run the length of the workpiece, and come back and route out the remaining 20 mm or so, you only really have that dust that may not be collected.

If you are concerned with dropping the piece onto the bit, you can also use a wedge on the out feed side and drop the workpiece to the bit.  Think of it as sliding out the wedge as the piece drops to the table.  I have never had to do that, but I know some have as a comfort.

Just as an aside, do you have the 26mm or 27mm hose connected to the 1400 under the table?  if you have it "stock" and have the 36 under there, make sure the Y is not connected to the CT.  In routing dadoes, the top hose does nothing of course.  Use a 27 or 36 under the table directly to the vac, no Y splitter.

cheers.  Bryan.

 

[grbmds]

Wouldn't you get better dust collection by cutting the dados with the OF1400 above on a track on the MFT? I know you'd like to use the CMS for everything, but there are other ways that could produce equal results. I don't know the answer, just giving a suggestion of how to get the better dust collection.

 

[RKA]

Would a spiral upcut bit do a better job drawing the dust toward the under table dust port? 

 

[bkharman]

Would a spiral upcut bit do a better job drawing the dust toward the under table dust port?

There are a lot of factors at play when doing a dado with a router bit.  Main one is how much wood is being cleared at one time... if this is a 19mm or 12mm bit, it will inevitably clear a lot of wood, evain with shallow passes, it will product chips/dust.  We also never asked, what you are cutting?  Hardwood, softwood, MDF? 

I am not sure that an uncut or would make a huge difference other then clearing the wood from the cut better/faster.

 

[tjbnwi]

This will happen with any router table while cutting dados or grooves. Very easy to fix/correct on the CMS.



Then there is this;



When using the guide arm and domed safety. [attachimg=1]

Tom

 

[Fridolin]

This will happen with any router table while cutting dados or grooves.

That's not quite right.
With this configuration i have next to no dust on my table when routing dadoes.
Under the table is a Casals 3000 (i.e.Freud) with an excellent dust extraction.
Through the "perforated" rings, the dust can escape to the router's extraction.

 

[sancho57]

Wouldn't you get better dust collection by cutting the dados with the OF1400 above on a track on the MFT? I know you'd like to use the CMS for everything, but there are other ways that could produce equal results. I don't know the answer, just giving a suggestion of how to get the better dust collection.

thats what I would do.

 

[tjbnwi]

I've never seen that type of table ring. It appears as if the leading edge of the cut would be in front of the slots, must draw a lot from around the bit.

Tom

 

[Fridolin]

That's a set of new INCRA rings.

The fence would be mounted to the right side of the table for doing dadoes (where the ditch in the table surface is).

 

[rljatl]

This will happen with any router table while cutting dados or grooves.

That's not quite right.
With this configuration i have next to no dust on my table when routing dadoes.
Under the table is a Casals 3000 (i.e.Freud) with an excellent dust extraction.
Through the "perforated" rings, the dust can escape to the router's extraction.

I use Incra rings like that too.  Excellent dust collection.

 

[semenza]

I've just setup my new CMS and dropped my OF 1400 into it. The first task I'm using it for is to plow out some dados. The problem is, it's spewing quite a bit of sawdust towards the outfeed side. It's a spray of dust at the start of the cut, then once the board is covering the cutter, the dust is pushed off the table. I'm using a 1" straight bit. Router speed set to 1. I'm taking out 1/16" on poplar boards about 3.5" wide and 7' long. I understand that little can be done to stop the spray for the initial cut, but once the cutter to covered by the workpiece, I am expecting better DC than what I'm seeing.

I've tried faster and slower feed rates. I've tried plugging my CT22 directly into the router with the D36 hose since the fence DC isn't in play with a dado (I don't think). I've tried changing the ring around the cutter from one that barely clears the bit to one step larger.

Since I'm new to the CMS (and router tables, in general), I'd love any tips you have to share on improving DC when doing dados.

Thanks!

Richard

  It is just that the router shoots the dust down the channel that is being cut in the only direction it can go with enough speed that it gets passed the DC suction too quickly for it to get sucked in.  You might try mounting a vacuum attachment / hood (a wide floor nozzle would work) at the edge of the out feed table.

Seth

 

[rajuliano]

Thanks to everyone for their suggestions. These are some great ideas. The most effective for me was to clamp the crevice nozzle to the underside of the out feed side. Worked great to minimize cleanup.

Richard

 

[tjbnwi]

Another thing to try--

After seeing the Incra rings I rethought what I've been doing for years. I've always used the ring that best fit the bit diameter. I had to cut some dados yesterday, I went with a ring that had an opening at least twice the bit diameter. The improvement to dust collection was very noticeable.

Tom

 

[Just F Me]

Not sure if you found a fix for this, but check out this video where the guy makes a dado.

 

[nclemmons]

That's a great tip from the video!

 

[Just F Me]

I'm not sure how safe that is though.  Festool manual doesn't recommend routing backwards but maybe it doesn't matter because its so small?

 

[Stone Message]

With all router operation, both in and out of the CMS (or other router table), you have to try and visualise the route that the dust will want to take and see whether your attached dust collection is going to do a good job along that route.

Builderbob is spot on in this case - it is the nature of this type of cut on any router table. Bkharman's work around will stop most of the dust going everywhere but may force a lot of the dust and debris to remain close to the cutter which may in turn cause it to heat up.

I used to have a small workshop vac (an old Dyson) which I could setup with a nozzle in the right place to augment normal dust collection. That might be the better solution. Alternatively, have a slightly bigger ring opening under the cutter to improve the flow to the attached extractor.

Peter

 

[TomGadwa1]

NEVER route backwards!!! An invitation for personal injury!!! All it takes is the cutter grabbing the workpiece then a projectile is born! If you are lucky your hand, arm or body will not be pulled into the cutter with disastrous results!!! Not to mention collateral damage from the projectile. I tried routing backwards ONCE and even used feather boards to keep myself from the cutter and an attempt to keep the workpiece under control. My 3.5 HP router grabbed the workpiece and mangled it and made a disturbing sound. In woodworking disturbing sounds are a warning! I was lucky and will not try that again!! Safe woodworking to all!!