Polishing tiny grooves with cnc

[scrapper400]

Hi folks,
Can anyone tell me if they have ever used a cnc machine to polish a surface? We are machining a mold for a lens with a series of tiny grooves and wish to polish each one of the grooves. The tip of the polishing bit would preferable be a 1mm ball nose.

Can anyone suggest anything or any alternative ways to polish this mold in aluminium without losing the sharp profiles of each groove?

Scrap.

[SORCHEROR]

first of all,aluminum is not the best choice for fine detail which needs a lens quality high polish,usually hardened tool steel,stainless or s-7,the only way i would do it if i had to would be take a small peice of cast iron and cut the form on it and use that with a fine diamond compound,we use a dme profile,or dipofile,to move the cast iron form back and fourth,cast iron is soft and is porrous to hold the compound,on alunimun if u use anything other than diamond compound u will scratch it,good luck,thats my 2 cents

[SORCHEROR]

since its aluminum you might be able to use carbon graphite instead of cast iron,just a thought,i have used fine emory to polish aluiminum and than diamond,but nothing with fine detail

[scrapper400]

Cheers Sorcheror,
We were thinking of cutting the profile negative on a piece of perpex and using some peek paste to try to polish or lap it down. I'll look into the carbon graphite though.

Thanks for your time.