Looking for 20mm Router cutter to make MFT type top..

[lastminute]

Looking for 20mm Router cutter to make holes in MFT type top..already got 1/2" bit, but need 1/4" SHANK!

Thanks for any advice.

Gerry

 

[Doug B]

https://www.wealdentool.com/acatalog/Online_Catalogue_1_4__Shank_237.html
You’ll have to scroll down HTH

 

[lastminute]

https://www.wealdentool.com/acatalog/Online_Catalogue_1_4__Shank_237.html
You’ll have to scroll down HTH

Thanks Doug.....cutter ordered!

 

[petermillard]

Be aware that many “20mm” bits for MFT tops bore a slightly oversized hole; the ‘made for the job’ Festool bit I used gives a ~20.15mm hole so I had an engineer pal grind it down to make a snug fit with the 19.95mm Benchdogs. There’s a Trend 20mm bit that works well, but it’s 1/2” shank. Trend C030DX1/2TC - Two Flute Cutter 20.0mm diameter. Be interested to hear how you get on with the Wealden bit.

Edited to add; those Wealden bits look like straight cutters to me, don’t think they’re the ones to use for boring holes.

 

[Phil Pascoe]

It does say they're suitable for plunge cutting. They're a bit short, though.

 

[petermillard]

It does say they're suitable for plunge cutting. They're a bit short, though.

Plunge cutting isn't boring though - aside from the initial short (~6mm max??) plunge, it relies on lateral movement to make the cut; boring bits have a cutter in the base, between the two flutes to clear the bottom of the cut.

 

[ScaredyCat]

*COUGH*

 

[petermillard]

*COUGH*

The OP did say he needed 1/4" shank though, and the Festool bit I used is 8mm.

 

[Trevanion]

*COUGH*

PERSISTANT COUGH DETECTED, EVACUATE THE INFECTED

 

[TheTiddles]

Plunge cutting isn't boring though - aside from the initial short (~6mm max??) plunge, it relies on lateral movement to make the cut; boring bits have a cutter in the base, between the two flutes to clear the bottom of the cut.

Go on, how is plunge cutting not boring? Are you thinking ramp cutting?

Aidan

 

[petermillard]

Go on, how is plunge cutting not boring? Are you thinking ramp cutting?
Aidan

Standard 2-flute cutters won't bore a hole - try it, you'll end up with a negative donut. As I said further up, bits for boring holes have an extra cutting edge in the base to clear the waste - the middle of the donut. Standard 2-flute cutter on left, boring bit on right:-

 

[TheTiddles]

Yep, but isn’t a plunge cut also a bore?
Aidan

 

[Phil Pascoe]

Standard 2-flute cutters won't bore a hole - try it, you'll end up with a negative donut. As I said further up, bits for boring holes have an extra cutting edge in the base to clear the waste - the middle of the donut. Standard 2-flute cutter on left, boring bit on right:-
View attachment 96849View attachment 96849

... sizes above 9mm diameter having an additional centre carbide tip to ensure a faster and cleaner cut when plunging ...

Wealden.

 

[Doug B]

... sizes above 9mm diameter having an additional centre carbide tip to ensure a faster and cleaner cut when plunging ...

Wealden.

Yep & if folks look at the photos in the link of the bigger cutter you can see the extra tip.

 

[petermillard]

... sizes above 9mm diameter having an additional centre carbide tip to ensure a faster and cleaner cut when plunging ...

Wealden.

 

[bp122]

Could you not make a small stepped /straight drill guide and use forstner/auger bit, respectively? Just curious.

 

[tradesman]

is this it?? Trend 1/2 Shank CraftPro TCT 2 Flute Straight Router Cutter Bit - FULL RANGE 5027654037898 | eBay

 

[tradesman]

and sorry to add -0 but does this work?? Festool mft drilling aid 20mm | eBay