Noobs' Feeds & Speeds

[GaryWilliams]

Hi Nick and Washout,

Thanks for the explanations and ideas. I entered various values into GWizard and selected 'Fine Finish'. Here are the final figures calculated:

1 flute 6mm carbide endmill
50mm stickout (Bottom of collet to tip of endmill). The block of Aluminium is 40mm thick.
1mm depth of cut
15671 rpms
2.76 mm/sec (165.5 mm/min)
Fine Finish

Any higher and the deflection is too much, so now to buy a good endmill :)

To use a 3 flute, I would need a spindle speed of 36,000rpm. My 6040's max is 24000rpm. I don't know the weight of my gantry. I didn't think to check that before assembly. I have purchased a 'clock micrometer' to check the alignment of the gantry to the bed.

"using something like adaptive clearing". OK, I need to read some tutorials.

Cheers

Gary

[magicniner]

Gary,
Have you tried a shallower cut with faster feed with the 3 flute? You ought to be able to get enough advance per flute that way, you'll need air to clear chips and cutting lubricant (WD-40 or a 30/70-20/80 engine oil/paraffin mix) to reduce chip adhesion to the cutter, a quick squirt into the cut once every pass or two is usually adequate,

- Nick

[GaryWilliams]

Hi Nick,

OK, back to GWizard to try new numbers. I have an aerosol of cutting oil and a small air compressor and gun. As this will get messy (I was hoping to make dry cuts) I need to find/make a large perspex cabinet/cover. Yet another project, O Joy!

Cheers

Gary

[sinnsvak]

Hi Gary, my 6040 are not too fond of deep (long stickout) cuts with any 2 flute cutters. 1 flute seem to be much more in harmony with the rigidity, on my machine at least. The cutters I prefer, are from sorotec.de, 1 flute alu end mills. They stay sharp forever, and dont break easy.

Just my thought on what have worked best for me.

[GaryWilliams]

Hi Gary, my 6040 are not too fond of deep (long stickout) cuts with any 2 flute cutters. 1 flute seem to be much more in harmony with the rigidity, on my machine at least. The cutters I prefer, are from sorotec.de, 1 flute alu end mills. They stay sharp forever, and dont break easy.

Just my thought on what have worked best for me.

Hi sinnsvak,

Many thanks for that information. I was having problems finding 1 flute endmills. I'll purchase one from Sorotec.

Regards

Gary

[Billythefish]

Hsmadvisor....

much better than gwizard imo.

[Davek0974]

HSMAdvisor here too.

Input your data and then set the cutter engagement slider to minimum performance for this machine.

Oh, and will definitely need lubricant on that - WD40 is good, paraffin too, maybe air-blast to clear the chips, chip recutting is a major tool-killer.