Single flute carbide cutters

[Jonathan]

I heard that straight flutes are better for ply as it's less likely to lift. Or even better apparently are compression cutters since they squash the material together on both sides... expensive though.

The finish I was getting with the silverline 6mm, 6mm per pass, was fine ... Problem was it snapped (twice). I'm hoping it's just a matter of getting the feedrate etc correct for them to last... the good brands you mention do cost a lot more.

Shall I buy them and we can share? (annoying that's it's an odd number)

[AdCNC]

Shall I buy them and we can share? (annoying that's it's an odd number)

Sure if you want to.. how do you want to do it tho. you have 3 and ill have 2?

[Jonathan]

Sure if you want to.. how do you want to do it tho. you have 3 and ill have 2?

Sounds good to me. I was going to say I'll have 3 but didn't want to sound greedy :lol: I can buy them today - no doubt they will take forever to arrive. They shouldn't cost much to post. There's also 25mm long for £4 more ... not sure which to get as the 22mm will be stronger, but 25mm might be useful...

If it snapped twice, back off a bit on cut, 100% of depth per diameter is a bit much on 6mm.

Ok then, I've just checked the Gcode and it was actually 5mm per pass, not 6mm as I thought. I'll try less next time.
I was using 2500mm/min and 18,000rpm ... that makes the chip load very low which I suspect was what caused it to break. It broke when I lowered the feedrate to 2000mm/min. I think I'll try something like lower rpm but keep the same feed next time to reduce the heat.

[John S]

The finish I was getting with the silverline 6mm, 6mm per pass, was fine ...

If it snapped twice, back off a bit on cut, 100% of depth per diameter is a bit much on 6mm.