Fluffy mdf

[Mad Professor]

Just to give an idea.
With my DIY cnc router, I can do 18mm MDF cutting at around 3-4m/min, full doc @ 24k rpm, with a 10mm twin straight flute TCT cutter.
I am left with clean cuts, no fur's etc.

[JAZZCNC]

Just to give an idea.
With my DIY cnc router, I can do 18mm MDF cutting at around 3-4m/min, full doc @ 24k rpm, with a 10mm twin straight flute TCT cutter.
I am left with clean cuts, no fur's etc.

Ye but that's only because of them brackets I cut for ya . . .

Now that's more like the speeds and with a decent sized cutter, thou I would suggest doing faster in 2 passes for increased tool life.
I always work on 50% cutter Dia has max DOC thou in soft stuff like this I'd do 100%.

[birchy]

I think a lot of people under estimate the importance of speeds and feeds and how they affect tool life.

[Steven W]

Mad Profs calc are to run at 50 to 60mm/sec. What would you recommend with a 6mm twin straight fluted bit. Also would it be possible to do this in say 3 passes? Still not sure what the VFD readout at 3000 means. The readout can go to 4000 when up full. The max spindle speed is 14,000rpm according to the spindle spec.
I agree that speeds and feeds will have a big influence on tool life. Obviously I am looking for the best running conditions for longest tool life on this type of mdf

[birchy]

Maybe the VFD is not setup correctly?? It could well be that your cutter is only spinning at 3000RPM! Have you got a tacho so you can check the ACTUAL spindle speed? Or maybe it's Watts? Is it a 4kW spindle?

[Steven W]

Had a look at the VFD display and its set at Hz. There is a light to read in rpm but haven't figured out how to display this yet. Not being electrically minded I have assumed that 4000Hz is 14,000 rpm. Right or wrong

[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.?