Hi all hope your having a good day
This is my second week using my cnc router
I am cutting double faced melamine chipboard 1.8 cm
I own a weeke vantage 38l a 6 tons cnc router and i am using a 3 flutes 9.5 mm compression bit at 16000 rpm and 20 m/min feed rate
The cut is clean on both sides but thr bit burned my finger is it normal ??

I'm not familiar with your router, but your speed is way too slow. 20 m/min is something like 65 ft/min. Our router is an older model and we run at 400 ft/min.

Also, how is your dust collection? Good dust collection will help to cool the bit.

We cut solid wood at 75 ft/m and solid surface at 60 ft/m

good luck

Use chip load to calculate speed.

0.025 * 3 * 16000 is 1200 IPM or 31 MPM.

Watch the speed on the machine to see if it hits the programmed speed. When cutting small parts, you may not hit it. If not, drop RPM.

I run melamine, MDF and baltic birch 16 hours a day and have found that life is better with 2 flute tools.

We cut plywood all day and the tool is just warm when we are done. With the proper feed rate that generates the correct chip load the chips take the heat away. You can feel it in the chip if you touch it right after its cut. To run a 3 flute at 30m/min you will need 15hp or more spindle.

I would call the tool manufacturer and get feed and rpm recommendations. I would get suggestions on tools for what you want to accomplish. If you are not at capacity with the machine running it slower with a 2 flute tool might be a better idea. Less wear on the machine, the parts are easier to hold.

thank you for your response
first of all paul i think 400 ft/min is impossible
and i have a 7.5 hp dust collector and 2 air blower running on my bit

Dropout , Bill thank you for the tip i have a 9kw spindle i don't know if i can hit 30 m/min and i why does a 2 flute bit better than 3
anw i will give it a try
should i increase the feed rate ?

Anthony,

2 flute is better all around if you are cutting sm parts. You will probably not be able to hit the needed feed rates for the 3 flute. That is why the 2 flute is usually better. You should be able to hit 800 to 1000 IPM without a problem.

**Always check and change collets

The difference between 2 flute and 3 flute is that in order to get the chip size big enough to carry away the heat, you need to either move the tool faster, or lower the rpm. The more flutes on the cutter, the smaller the chip size will be at a given feed rate and rpm. For example, Dropout's calculation is for a 3 flute cutter, it will make a chip that is .025 inches thick. To make the same thickness chip with a 2 flute cutter at 16000 rpm would be 20 M/min. So if you are concerned that your machine will not do well at the 31 M/min you could change to a 2 flute bit. Your machine has already proven that it can cut at that speed. Basically you want to make the biggest chip you can, without compromising the quality of cut. The chips will carry away the heat. Increase the feed rate until the quality of cut starts to decrease and then program the tool to cut 10-15% slower. and the same with RPM, lower it until the cut quality decreases and then program that tool to be 10-15% higher. That should help you to get close to a feed rate that is good for your machine, material, and tool life.

Don't let it run unattended till you figure this out. You could easily get an ember going in the dust. Hope your dust bin is outside.

Thank you all for your help
i just tried a 3 flute bit at 16000 rpm and 30m/min and the chip are bigger now and the bit is warm after cutting a big size melamine sheet thank you for your time and help