mystery artefacts...

[Boyan Silyavski]

Looks like clogging. Do you use some kind of air blast while machining?

[aegir71]

Looks like clogging. Do you use some kind of air blast while machining?

Hi Boyan, i don't at the moment, would having a suction system work equally as well as I would like to recover the chips to recycle?

Does air blasting have a beneficial effect on the surface finish in wax to your knowledge?


thank you

[magicniner]

In addition to moving chips air will cool your work and tool to some extent.
Vacuum can never provide the chip clearance possible with compressed air, with vacuum you have a maximum (which you never achieve) of 1 atmosphere (Circa. 14psi) to play with, by using compressed air through blunted medical canula needles as nozzles you can get excellent results with relatively deep cuts & small tooling, the needles are easy to incorporate into standard snap-together coolant tube system nozzles, you can experiment with angle, position and number of nozzles to optimise chip clearance,

- Nick

[Boyan Silyavski]

I use 0.8mm nozzle in my setup / fog less/ and it will blow and clean chips from slotting with 20 mm cutter on the mill without any problem, so i assume 1 needle 0.5-0.8mm will be alright. Have not machined wax, but on any plastic its beneficial. I dont see any other reason for that marks, except some vibration on Z. If its clean around , when you finish the job you could vacuum the wax / i do that when machining brass. Air cools the tool quite a lot, much more than vacuum can do.

[aegir71]

Thanks guys, you have persuaded me to get myself a compressed air system as you have both described.
I'll have a look at the rigidity of the z axis too.

Onwards and upwards, thanks again for your help!