Fluffy mdf

[JAZZCNC]

With 6mm cutter at 6mm DOC 13,000RPM the minimum I'd be cutting at would be 4mtr/min and that's allowing for a weak machine. If your machine is strong-ish then you'll be wanting to be around 5-6Mtr/min and could go much higher if wanted 8-9mtr/min with 14-15K rpm.

The VfD could be showing Hz but it may be 400.0Hz not 4000Hz and it's not showing the point. What make of VFD is it.?

[Steven W]

Thanks for that. Will try tomorrow. It's a Chinese machine so no idea what make the vfd is

[Swarfing]

Still no mention of the type of cutter used? I have better results using a single or two flute cutter. Using a three or above cutter results in fluffy edges on cheap MDF. Rules here is always cut your material as soon as you buy it as well, MDF that has been laying around is not good unless you buy premium material.

[Steven W]

I have been using a 6mm two fluted bit. Bought the material today that ran well. The cheap mdf had been in my store for about 6 months. Definitely the quality of board makes a big difference. It's finding the optimum speed and feeds rates for it

[JAZZCNC]

The cheap mdf had been in my store for about 6 months. Definitely the quality of board makes a big difference. It's finding the optimum speed and feeds rates for it

That will be your problem.? It's soaked up all that Scottish air. Bet if you measure it accurately it's thicker than the new stuff.?
Bloody hate MDF it's not even fit for burning.!!!

[Steven W]

Hear what you're saying. If I remember correctly its expanded by about 0.3mm since I bought it. It suits my purpose for the types of model I make but there is nothing better than working with real hardwood

[Steven W]

Just to update. Cut a few models yesterday with a feedrate of 40mm/sec at 6mm DOC. The spindle was running a 6mm two fluted bit at 24,000rpm (flat out according to the dial). The cut was just as good when running at 20mm/sec. When I went above 40mm/sec there was like chatter marks on the cut edge. Is this due to the feed speed being too fast for the cutter speed or is it that the cutter is getting blunt. I have never seen this before