Author Topic: 20mm Router Bits  (Read 42857 times)

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Offline JBird

  • Posts: 116
Re: 20mm Router Bits
« Reply #30 on: January 30, 2015, 02:37 AM »
I realize this thread is a bit old, but I have the same question: as Michael stated above, if the Festool 491072 produces a larger hole (.2mm) than the standard MFT holes, is there an undersized 20mm bit that produces the same MFT-sized holes?

Did you ever find a 20mm bit that drills a more proper 20mm hole? Did you try the CMT you linked to?

I guess I shall answer my own question for the record. I have tried the CMT bit and the holes are also about 20.2mm. They feel noticeably more loose than the MFT holes. Too loose in my opinion.

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Offline Pizza Steve

  • Posts: 167
Re: 20mm Router Bits
« Reply #31 on: January 30, 2015, 07:11 AM »
Thank you for testing it and reporting back!  I hadn't tried out either the CMT or Festool bit yet.

Offline emlclcy

  • Posts: 27
Re: 20mm Router Bits
« Reply #32 on: February 17, 2021, 01:29 PM »
Thank you for testing it and reporting back!  I hadn't tried out either the CMT or Festool bit yet.

hi, is there an update to this as i want to make my own mft style bench.
which is the most accurate 20mm cutter?
regards
carl (uk)

Offline guybo

  • Posts: 13
Re: 20mm Router Bits
« Reply #33 on: February 17, 2021, 02:21 PM »
Hi, I have had good success with festool 490972, I have parf and qwas dogs. guy

Offline emlclcy

  • Posts: 27
Re: 20mm Router Bits
« Reply #34 on: February 17, 2021, 04:45 PM »
Hi, I have had good success with festool 490972, I have parf and qwas dogs. guy
is this ok to plunge? it looks like an edge trimming bit??

Offline guybo

  • Posts: 13
Re: 20mm Router Bits
« Reply #35 on: February 17, 2021, 05:44 PM »
Hi again, yes plunge smooth and easy on speed 6, I use a 1010 with the lr32 in mdf. I also use a TSO rail square to make it fast.Happy plunging. guy

Offline Coen

  • Posts: 799
Re: 20mm Router Bits
« Reply #36 on: February 17, 2021, 06:16 PM »
Hi, I have had good success with festool 490972, I have parf and qwas dogs. guy
is this ok to plunge? it looks like an edge trimming bit??

It has a cutting edge on it's 'head' too. However, it's still not the use the bit was primarily designed for. I would use the earlier mentioned Festool 491072

Online Crazyraceguy

  • Posts: 225
Re: 20mm Router Bits
« Reply #37 on: February 17, 2021, 06:58 PM »
I did my first MFT style assembly table with a Freud 20mm router bit, but it was a multi-step process.
I had a 1/4" mdf template made on the CNC. It was a full 4' x 8' sheet, so there was no moving of the template during use. The template had 1" holes, so I could do it with a bushing. I did it with two different bits, first with a 1/2" shank, 1/2" diameter plunge bit. Then a second time with the Freud 20mm bit, which was only 1/4" shank.
This was all done to a 1 1/8" thick sheet of mdf, not thinking about the clamps. It worked fine with the dogs, but the clamps wouldn't go through. Then I had to turn the sheet over and use a 45 degree chamfer bit to relieve the back, so the clamps would fit too.
All in all, it took 3 cuts for each of 275 holes. The Dewalt DW618 router that I had at the time had the best dust collection ability of anything I owned, so it did the job. I took me two evenings, after work, but it was the only one I had ever seen at that time (2014)
The one I have now was done with the Parf guide system. It has even more holes, but was done with more normal 3/4" mdf. I actually liked the thicker sheet better, but it's not worth the work it took.
CSX
DF500 + assortment set
PS420 + Base kit
OF1010
OF1400
MFK700
TS55, FS1080, FS1400 holey, FS1900, FS3000
CT26E + Workshop cleaning set
RO90
RO125
ETS EC 125
RAS115
ETS 125 (2)

Offline rst

  • Posts: 2533
Re: 20mm Router Bits
« Reply #38 on: February 17, 2021, 07:13 PM »
I've made multiple tops with the Festool 20mm bit 491072, including a 64" x 102" split cutting/assembly top...probably bored 500-600 holes using the LR-32 setup and 1400...dogs fit perfectly.

Offline Imemiter

  • Posts: 138
Re: 20mm Router Bits
« Reply #39 on: February 17, 2021, 08:45 PM »
I found a HSS spiral bit 490951 that Amazon would get me from AU. Also using it with a 1010 on an LR32 with a rail square. The holes measure a tight 19.8mm. The only Festool dogs I've got are the clamping elements and they snap right in. 
CSX, TID 18, HKC 55, OSC 18, OF 1010, Domino XL, DTS 400, ETS 125, RAS 115, LR32, CTSys, CTMidi, CT-VA-20

Offline emlclcy

  • Posts: 27
Re: 20mm Router Bits
« Reply #40 on: February 18, 2021, 04:08 AM »
I found a HSS spiral bit 490951 that Amazon would get me from AU. Also using it with a 1010 on an LR32 with a rail square. The holes measure a tight 19.8mm. The only Festool dogs I've got are the clamping elements and they snap right in.

i wonder what its life span is being HSS?

Offline Cheese

  • Posts: 8166
Re: 20mm Router Bits
« Reply #41 on: February 18, 2021, 09:46 AM »
Like rst, I've used the Festool 491072. It has carbide cutters and produces a clean hole. The cutting geometry is specifically designed to be used in a router at 10,000 to 14,000 rpm.

Offline Imemiter

  • Posts: 138
Re: 20mm Router Bits
« Reply #42 on: February 18, 2021, 12:13 PM »

i wonder what its life span is being HSS?

Seems to be doing okay after 60ish holes in 3/4 MDO. But I don't expect it to last like carbide.
« Last Edit: February 18, 2021, 12:42 PM by Imemiter »
CSX, TID 18, HKC 55, OSC 18, OF 1010, Domino XL, DTS 400, ETS 125, RAS 115, LR32, CTSys, CTMidi, CT-VA-20

Offline RobS888

  • Posts: 17
Re: 20mm Router Bits
« Reply #43 on: February 18, 2021, 03:34 PM »
I used this Bosch, some burning of the MDF, but the bit was ok.

https://smile.amazon.com/gp/product/B000AS327K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1