[Jacala]

Hello!

I'm the proud owner of a Gweike WK1313 router and it functions great (after ditching the DSP and installing Eding CNC)

The machine works, has a 3 kw router and can run all day. My problem is with the bits. I'm buying good quality spiral bits but they break.

working speed: 3000 mm/minute = 136 inch / minute
depth of cut: 6 mm = 0.27 inch
RPM = 22000

Material = Oak

What am I doing wrong?

Feed = N x cpt x RPM

Feed N chip load rpm
7200 2 0,2 18000

The formula says that the machine should run at 7200 mm/minute, thats more than twice so fast. The bit looks good, sharp and no burning marks and was cutting great until it broke.

Advice anyone?

[IN-WondeR]

What size is the bit you are using??

[Jacala]

The bit is
Diameter=6
total length= 70 mm
length of cutting edge= 27 mm

[IN-WondeR]

total length 70mm, how long a hangout does the tool have?? I mean how far from the spindle collet is it sticking out??

[Jacala]

Stickout is 30/35 mm

[IN-WondeR]

Ok, then that should not be a big problem.
Do you have a link for your spiral cutters?

And are you sure your spindle is running in the right direction?

[Jacala]

the direction is good, nice and clean chips are made.

3003 - Solid carbide cylindrical spiral cutter positive (Z=2) - JHV Tools - Specialist for production of cutting tools for (CNC) machines

[IN-WondeR]

Hmmm, looks weird that they would break so easily then.

The speed and depth of cut should not be enough force to kill your bit. Only thing I could think of, is if the spindle is not rotating at the speed stated in your software.

Have you tried to contact the manufacturer of the cutting tool, and asking them, if they are experiencing any problems with their tools from costumers?

[Jacala]

I've contacted the manufacturer and he is sending me a new bit.

He also didn't know what the problem was and I should try again. The spindle rpm is almost certain good. next to the software the value on the spindle power supply say 22000 rpm.

Lets try again with the new bit and then I'll give some feedback.

[IN-WondeR]

We are in agreement that it's a achinese built router you have...
Have you tried testing the spindle speed on a RPM meter??

If the base speed of the motor have not been set correct on the VFD, then the spindle is running a lot slower than showing on the VFD display.

I don't know what brand your VFD is, but if the menu system is the same as on the cheap Huanyang, then PD0144 should be set to 3000 as the base speed of the spindle.

[Jacala]

I've ordered a tachometer to check and gonna check with the new bit.

The manufacturer send me 2 new bits: a 2 flute and a 3 flute to check.

Good service of them.

[klaas123]

Have you calibrated the machine in Mach3?
Very nice machine you have!

[Jacala]

Hello Klaas!

I don't like Mach3, to much screens and collors.

I work with Eding CNC and that works much easier (i've got mach experience but Eding was way faster to setup)

In eding the router works with a 1 to 10 volt signal and that seems to work fine.