Author Topic: DIY Lifelong Self Cleaning Filter Bag for CT  (Read 5539 times)

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Offline TheSergeant

  • Posts: 64
DIY Lifelong Self Cleaning Filter Bag for CT
« on: June 10, 2016, 04:17 PM »
Thought this might be of interest to some people who have a CT vac and are contemplating the lifelong filter bag.  I was considering one for my CT22 but when I saw the price I almost fell out of my seat.  $240?!?!  A couple years ago I upgraded the 5 micron (?) cloth bag on my 2hp dust collector to a canister filter and had the old bag folded up and unused.  I decided to cut it part and sew together my own reusable CT bag using the plastic port from a paper bag and then sewing in a 9.5" zipper into the back.  I epoxied the plastic port on and it's not budging but if it does I'll add an internal backing plating and then rivet it on and sandwich the fabric.   The zipper is a 'water resistant' zipper with the urethane side facing in and the teeth facing out.  Dimensions are 10x10x10, which was based off the measurements of the paper bag.

EDIT -- Adding "self cleaning": Just finished installing and using the bag.  Everything works great and dimensions are good, although I could have made it an inch wider.  I noticed when I opened the CT up the bag was holding its cubic shape.  To add in a "self cleaning" feature I'm going to sew a couple patches onto the top of the bag and put a stack of washers in each.  That way when you stop the vacuum the bag collapses down from the weight and breaks off any caking that may occur from fine dust.

Btw, hi Freya.









Interior: heavyweight thread is used for the primary construction (T40 or T70 preferably) with ~10spi (tight gaps to minimize air leaks) with an overcast edge to add an extra layer of protection and to prevent fraying.  The water resistant zipper is best because it won't allowed dust to escape but it also protects the zipper teeth from dust/debris.  Sew the zipper on and then sew an additional stitch 1/32-1/16" from the outside edge of the zipper tape to keep it flat against the fabric.  Keeping it flat against the fabric will keep debris from accumulating under the seam.



« Last Edit: January 24, 2017, 12:22 PM by TheSergeant »

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Offline ear3

  • Posts: 3294
Re: DIY Lifelong Filter Bag for CT
« Reply #1 on: June 10, 2016, 04:34 PM »
Dude, along with a non-CMS router table/lift assembly for the Festool routers, this is like the Holy Grail of DIY Festool hacks.  Nice work -- you realize that if you made it tight, you could probably sell them for a decent price, yes?

Thought this might be of interest to some people who have a CT vac and are contemplating the lifelong filter bag.  I was considering one for my CT22 but when I saw the price I almost fell out of my seat.  $240?!?!  A couple years ago I upgraded the 30 micron (?) cloth bag on my 2hp dust collector to a canister filter and had the old bag folded up and unused.  I decided to cut it part and sew together my own reusable CT bag using the plastic port from a paper bag and then sewing in a 9.5" zipper into the back.  I epoxied the plastic port on and it's not budging but if it does I'll add an internal backing plating and then rivet it on and sandwich the fabric.   The zipper is a 'water resistant' zipper with the urethane side facing in and the teeth facing out.  Dimensions are 10x10x10, which was based off the measurements of the paper bag.






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Offline jobsworth

  • Posts: 4440
  • Burger Babe Says: I Even Buy Green Bananas
Re: DIY Lifelong Self Cleaning Filter Bag for CT
« Reply #2 on: June 12, 2016, 01:20 PM »
Nice work man I wish I was as cleaver as some of you guys here.
Loving the Calif sun....

Offline JimmyJames

  • Posts: 4
Re: DIY Lifelong Self Cleaning Filter Bag for CT
« Reply #3 on: January 23, 2017, 11:05 AM »
Yeah man, I'm just getting into Festool and would LOVE an option like this. Nice work.

Offline tazprime38

  • Posts: 238
Re: DIY Lifelong Self Cleaning Filter Bag for CT
« Reply #4 on: April 18, 2017, 05:17 PM »
Any recommendations on cheap filter bags that could be adapted to make your own reuseable bags for any dust extractor?

Offline John2532

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Re: DIY Lifelong Self Cleaning Filter Bag for CT
« Reply #5 on: April 18, 2017, 08:47 PM »
I don't know if they will ship to the U.K. but for raw filter material you might check out americanfabricfilter.com   They made me an oversize replacement top filter for my Jet DC and they were easy to work with.  If memory serves me correct it is a 1 micron fabric.




edit to correct url address
« Last Edit: April 18, 2017, 08:51 PM by John2532 »

Offline Pike_101

  • Posts: 10
Re: DIY Lifelong Self Cleaning Filter Bag for CT
« Reply #6 on: April 18, 2017, 09:41 PM »
I always empty the regular bags on the larger CTs using my central dust collection. Remove the top, pull the vacuum hose off and suck it all right back out. Takes maybe a minute and drastically reduces the expense of bags. I find I empty the standard bags 5-10 times before I toss them, especially as these get used almost exclusively in processes that make larger chips (domino/routing.)

The Midi I use for sanding and cleaning up fine dirt/dust I just toss those bags. It takes a very long time to fill them and I'd rather keep that fine dust and mess contained where it is until disposed of.