feeds and speeds Recommendations for belt drive cnc

[marbles]

What size tool, and how many flutes?
What feed and speed did you use?

Try 4-5m/min at 15,000 rpm.

Hi Gerry,

Thanks for reply. I was using a single flute spiral bit. 4mm dia and 12mm cut length. Spindle set at 'No 6', which i would take to be about 26,000rpm

I'll need to get back to you about the exact feeds and speeds tomorrow. I set the feed rate in Aspire to 80mm/s in 2mm passes but of course this doesnt necessarily relate to the actual rate, which i'll work out tomorrow in Mach3.

I did notice that it was rounding corners again so that'll need a tweak in motor tuning for wood. Currently settings are for foamboard carving.

Thanks

[paulus.v]

I did notice that it was rounding corners again so that'll need a tweak in motor tuning for wood. Currently settings are for foamboard carving.

Check on the general config page if you have set the "Stop CV on angles > xx Degrees" You can try a value of 50 deg. and reduce it if needed.


To set the velocity and acceleration in motor tunning, increase the values and test by manual jogging and applying some force by hand against the moving axis until the motors will stall to easy. Then decrease a bit the values. You have to restart mach3 for the modified motor tuning settings to take effect.

[marbles]

Check on the general config page if you have set the "Stop CV on angles > xx Degrees" You can try a value of 50 deg. and reduce it if needed.


To set the velocity and acceleration in motor tuning, increase the values and test by manual jogging and applying some force by hand against the moving axis until the motors will stall to easy. Then decrease a bit the values. You have to restart mach3 for the modified motor tuning settings to take effect.

Thanks. All very helpful advice. As I have re-tensioned the v-groove wheels i've noticed it stalling a few times. so will modify and restart.

[marbles]

Seem to be getting somewhere with the 12mm ply cutting after carrying out everyone's suggestions + tightening a slightly slack gantry. Thanks for everyone's help.

Feed 20mm/s
Speed 15,000rpm
3mm, two flute up cutter on 2mm deep passes
Mach3: Velocity 2500 and acceleration 500

I'm not getting the F/S issue of cutting corners i had before and neither is the cutter or timber burnt.
I am however still getting a furry edge, the block of wood was lightly sanded to get rid of the burr edge so they are not so prominent in this image.

I'm going to invest in a 3.175mm down cut and compression cutter to see where those results take me. At the moment i'm only intending to cut smaller parts and perhaps some cabinet doors at a later stage when I upgrade the gantry and whole machine to R&P.

Cheers

[Ger21]

To get rid of the fuzzy top edge, use a downcut bit, and do NOT climb cut.