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Festool CT15 Pre-separator

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Project by rainjer posted 10-01-2020 01:50 PM 612 views 0 times favorited 7 comments Add to Favorites Watch

My wife bought me a Festool CT15 dust extractor for our anniversary a couple weeks ago. I decided I wanted to add a pre-separator to extend the life of the bag. I search online and found a design somebody was selling called a Festopper. I liked the concept but since the CT15 cannot accept Systainers i had to rethink the design.

My design used a adapter that sit over the outer edge of the CT15. The separator box sit inside the adapter to keep it in place. The box uses a Dustopper cyclone and a part of a 5 gallon bucket. the bucket is recessed and sealed into the lid. the lid is rabbited on the edges and has a rubber seal. It is held down with draw latches. The volume of the box is about 6.8 gallons.

I also added a handle using black 3/4” Steel Tek structural pipe and fitting. It mount to the CT15 using existing mounting points.





7 comments so far

View northwoodsman's profile

northwoodsman

392 posts in 4632 days


#1 posted 10-01-2020 09:17 PM

I was tempted to do the same thing but read several places where the static electricity could fry the circuit board in the CT. Oneida sells one, that appears to be Festool approved, that has the safeguards in place to prevent this. Unfortunately it has the Systainer mounting system but it could likely be modified to fit by using something in-between.

-- NorthWoodsMan

View rainjer's profile

rainjer

4 posts in 28 days


#2 posted 10-01-2020 09:32 PM

I am curious what the difference is between using it with the separator and without? Does the separator create a static charge?

View northwoodsman's profile

northwoodsman

392 posts in 4632 days


#3 posted 10-02-2020 12:50 AM

Evidently the spinning action and friction in the cyclone create a fair amount of static electricity. I’m certainly no expert so here’s a link to the unit itself. Dust Deputy for Festool CT

-- NorthWoodsMan

View Sandy's profile

Sandy

238 posts in 4810 days


#4 posted 10-02-2020 01:25 AM

As the designer of the FESTOPPER, I can address a number of issues that keep popping up. First, I have never had, nor have I learned of, any issues with problems of static electricity causing ANY damage, whatsoever, with the FESTOPPER design, based on the plans available on Etsy. Next, while there are NUMEROUS designs for parallel clamps , LR-32 clones, and ways (and jigs) to make MFT/3 tops, interestingly, I was BANNED from the FestoolOwnersGroup.com website, allegedly because I was selling “a competitive product”... Really??? I sold only plans, and NO products… Accordingly, I hope you publish the plans to create your unit, as it looks like you took a somewhat different approach than mine (i.e., using a wider unit) to make your device.

Sandy

View rainjer's profile

rainjer

4 posts in 28 days


#5 posted 10-03-2020 01:46 AM

Sandy – My box is made from 12 mm (1/2”) Baltic Birch. It is 12 wide X 14” long. The lid is 18MM (3/4”) Baltic Birch the same dimensions with a 1/4” X 1/2”+ rabbit around the edge. The hole I cut was 11” so it is a real tight fit to get the bucket to fit. The box dimension was dictated by the adapter piece I had to make. That happen to be the size the top of the machine is.

As far as the static goes. I would think an all plastic separator would create more static that a wooden one since wood is not a good conductor..

Jeremy

View Sandy's profile

Sandy

238 posts in 4810 days


#6 posted 10-03-2020 12:44 PM

As the designer, and longtime user, of the FESTOPPER, I can say two things about the so-called “static issue”. First, I have never had any problem with any of the ones that I built and use, daily. Second, none of the scores of people who purchased the plans on Etsy or directly, have ever reported any problems, either. The only “static issues” that I’ve ever been made aware of relate to the Dust Deputy, which is an all plastic unit and which is too tall, in any event, to be reasonably used on top of a Dust Collector.

Next, FWIW, even though I never sold anything other than plans, I was banned from the FestoolOwnersGroup website for allegedly selling “a competitive product”. Given the huge price difference and simplicity of making a FESTOPPER, compared to Festool’s own cyclone preseparator, it’s understandable that they were less than happy, particularly since it costs almost nothing other than scrap plywood to make extra collection boxes for the FESTOPPER, while an additional collection box for their unit costs more than an entire FESTOPPER, including the Dustopper unit.

While the FESTOPPER design is definitely the way to go for Dust Collectors that include means for attaching a Systainer, this project looks like a pretty good adaptation of my design for use on Dust Collectors that do not allow for Systainer mounting. Good job!

View WhattheChuck's profile

WhattheChuck

419 posts in 4446 days


#7 posted 10-07-2020 02:25 PM

I just gave in and bought the expensive, reusable bag. And use the Festool vac for sanding.

I use a cheap Shop-Vac for heavy load tools (like my router.)

-- Chuck, Pullman, WA

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