Enclosed dust box on router table

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Forum topic by JL7 posted 12-12-2010 04:03 AM 5747 views 0 times favorited 7 replies Add to Favorites Watch
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8690 posts in 3162 days

12-12-2010 04:03 AM

I just built a new router table and yesterday I installed a brand new PC 7518 motor. The motor is enclosed in a dust box, you can see photos here.

I was running the motor for 10 minutes or so, working on a project and noticed the table insert was getting pretty warm. Being new to 7518, I assume they do put off some heat, but should I be concerned that I’m not getting enough air to the beast?

Appreciate your comments.


-- Jeff .... Minnesota, USA

7 replies so far

View Howie's profile


2656 posts in 3120 days

#1 posted 12-12-2010 04:41 AM

JL, I have a LS/25 Incra with the super fence on my router table and a Rousseau lift and a Makita 1100. I built an enclosed box on mine just like you did except I left about 1/4” gap around the top between the table and the box. Haven’t noticed any heat build up. My DC runs thru the fence and also out the bottom of the box. Seems to work okay(not great but okay, still get some “blowby”)
That is one fine looking set up you have. Great job.

-- Life is good.

View Greedo's profile


473 posts in 3158 days

#2 posted 12-12-2010 10:05 AM

are you also extracting the air out of the dust box with a vacuum or dust extractor?
routers are cooled by the airflow generated by the internal fan, if that air has nowhere to go then the router will overheat. if i need to let it operate for over a minute then i will leave the RT door open, shop vac or not. otherwise it’s like an oven in there.

View Mark Shymanski's profile

Mark Shymanski

5623 posts in 3910 days

#3 posted 12-12-2010 10:39 PM

From the photos that great looking table looks pretty airtight, you may be restricting the air flow too much as Howie and Greedo said. It probably isn’t a fire hazard but it sure will be hard on bearings and windings.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View JL7's profile


8690 posts in 3162 days

#4 posted 12-13-2010 12:26 AM

Thanks for the comments. Yes I am pulling dust out with a collector. The box is all sealed except for around the door which has gaps. For now I will leave the door open, but locg term, maybe design an adjustable air intake?

Howie – do you have pictures of your Incra setup? I would be interested in seeing!


-- Jeff .... Minnesota, USA

View Bill White's profile

Bill White

5121 posts in 4158 days

#5 posted 12-13-2010 05:23 PM

Look at the Rockler router table dust box for an idea as to how you might vent the box. Gotta have some make up air in the box for the vac system to work properly.


View GaryL's profile


1099 posts in 3028 days

#6 posted 12-13-2010 05:32 PM

You probably need to improve the airflow into the box. I had the same problem when I built my router table cabinet. The upper portion of the cabinet is the dust box and I adjusted the doors to close tightly hoping to get air flow through the router base itself. This proved too restrictive and the router did get warmer than precabinet. I now crack a door open and it helped tremendously. I need to drill some vent holes to allow more air into the box.

-- Gary; Marysville, MI...Involve your children in your projects as much as possible, the return is priceless.

View JL7's profile


8690 posts in 3162 days

#7 posted 12-25-2010 03:54 AM

Thanks for all the replies – I appreciate it! I did make an improvement to the rig – see post here.

-- Jeff .... Minnesota, USA

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