20mm Router Bits

Jmaichel said:
fritter63 said:
Here's one of my new box beams made with the festool 20 mm bit (and lots of 4 mm dominoes!)

4abu4a4u.jpg

I really like those box beams. Did you cover them anywhere else in the forum or this there first appearance?

James

I showed a pic or two my thread about comparing the 20 mm straight bit with the festool bit. Search for "20mm" may be a space in there). On my iPhone right now.

I didn't think there was much interest in a build thread but I can post one if you want.
 
Thanks All,

I am planning on building one of Ron Paulks work benches. Now that I have this last piece of the puzzle. If the weather holds out I'll start cracking at it.

Eoghan
 
Fritter63

Are your beams torsion box?  It is one of the options I am thinking about as an assembly table.
 
Wooden Skye said:
Fritter63

Are your beams torsion box?  It is one of the options I am thinking about as an assembly table.

Almost. I left the bottom skin off so I can  secure the clamping elements from underneath. They will twist a little if unsupported:

abu6ysy2.jpg
 
Michael Kellough said:
I don't have that CMT bit but I do have the Festool bit and while it does bore a clean hole quickly the hole is about .2mm oversize so things like Qwas dogs fit a little loose. But, it's made for drilling holes that cast hardware will be inserted into and for for that purpose slightly over-sized is a good thing.

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?

Or is this something only a CNC machine can cut?

Thanks!
Steve
 
weekendwarrior said:
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?
 
JBird said:
weekendwarrior said:
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.
 
Pizza Steve said:
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)
 
Hi, I have had good success with festool 490972, I have parf and qwas dogs. guy
 
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
 
emlclcy said:
guybo said:
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
 
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.
 
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.
 
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. 
 
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