Carvex - burning and bending blades when cutting 140mm radius circle in MDF?

[semenza]

    OK, I made some circle cuts just to see how it would go.  1/2" MDF.  Carvex with Festool FSG Carvex  blade. The blade was used to start with.  Zero orbit. Feed rate .... pretty much a fast as I could go on the two larger ones. The smallest I slowed down a bit. I don't think it took more than 15 - 30 seconds on any of them. No burning on either side of any. In the pics the dark areas are just shadow.  The largest is about 5" diameter using the circle cutter. The others are about 2 1/2" and 1 1/2" diameter free hand. I got a little sloppy on the free hand but some parts of the curve are even tighter than the diameter due to that.  No difficulty , zipped right through.

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Seth

 

[eddomak]

    OK, I made some circle cuts just to see how it would go.  1/2" MDF.  Carvex with Festool FSG Carvex  blade. The blade was used to start with.  Zero orbit. Feed rate .... pretty much a fast as I could go on the two larger ones. The smallest I slowed down a bit. I don't think it took more than 15 - 30 seconds on any of them. No burning on either side of any. In the pics the dark areas are just shadow.  The largest is about 5" diameter using the circle cutter. The others are about 2 1/2" and 1 1/2" diameter free hand. I got a little sloppy on the free hand but some parts of the curve are even tighter than the diameter due to that.  No difficulty , zipped right through.
Seth

Thanks Seth! I feel a little guilty as I am the OP and still haven't reported back yet  :, but trust me, it was on my mind as I was doing the other DIY jobs around the house.

I have cut much smaller radius curves in the past freehand, with lots of different blades, so was very surprised when this happened. Oh, well, I promise to come back with some results soon.

 

[Fogy]

For circle cutting, try mafell P1CC ..

 

[Stone Message]

The Carvex is perfectly capable of doing what the OP wants.

Peter

 

[ben_r_]

Circles that size and depth Id rather cut out using a router and circle cutting jig. Im my case Id have used the OF 1400 with the Micro Fence Circle Jig.

 

[eddomak]

I feel a little guilty as I am the OP and still haven't reported back yet  :,

Well, I still haven't completed that project (shame  shame), and it ended up more important to give the little guy a stool for his cello playing soon, so I went to Ikea, bought a stool and cut the 4 legs to custom length, all for $12, which is probably cheaper than my birch ply scraps.

Anyway, I digress. I didn't end up finding any of the same version of the original blades, but think I used (in order):
Vermont American (as per photo)
Festool S50/1.4K
Festool S75/4 FS

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[Woodwork Wizard]

The best thing to do is get a Mafell P1cc which is fantastic and doesn't suffer any of the problems the Carvex has.