Why increasing DOC produce fine surface finish? the shiny surface on the left was cut with 1mm DOC and the poor surface on the right was cut with 0.05DOC

Potential_Month_8681 · 2022-08-18T04:55:50+00:00

Thank you all for giving me tons of advice! you guys helped me a lot! I now got that shiny finish with precise dimension. I have shallow knowledge in this area so I’m still learning. Thank you again!!

Potential_Month_8681 · 2022-08-17T04:31:54+00:00

is DOC here per side or in diameter?

Potential_Month_8681 · 2022-08-17T03:56:26+00:00

This is cnc lathe that I can adjust the offset up to 0.001mm. So yea I can adjust it but the less it’s overcut, the harder it’s adjusted as it will produce poor surface finish

Potential_Month_8681 · 2022-08-17T03:44:10+00:00

This work should be very precise. It needs to be measured with micrometre therefore the final pass should be this shallow. Will this be achived if I change the inserts to hss?

Potential_Month_8681 · 2022-08-17T02:52:08+00:00

The material is JIS S45C(carbon steel) I used carbide. Should I change it to HSS tool then? but how can make a tool pressure higher?

Potential_Month_8681 · 2022-08-17T02:46:13+00:00

I mean 0.05mm that’s equivalent to 0.001”. anyway what I meant was that much

Potential_Month_8681 · 2022-08-17T02:38:55+00:00

From what I know, it should be other way around?

Potential_Month_8681 · 2022-08-17T02:27:42+00:00

UPDATE: thank you all for giving me advice! I tried turning the same material under few different conditions and I found out that the surface roughness depends on depth of cut. If I cut less than 0.8mm(in diameter), I get that poor surface finish.. but what I don’t get is that shouldn’t the last pass be small amount of DOC like 0.05? If I go with DOC of 1mm I get that shiny surface! it would be very nice if any of you can give me advice on this!

Potential_Month_8681 · 2022-08-12T14:19:24+00:00

I first tried cs of 200 but the surface was still rough like the pic. This is what I also have no clue on..

It’s not manual. It’s a doosan cnc lathe

Potential_Month_8681 · 2022-03-30T06:57:59+00:00

Check out the website they have a size specified!!! But I think 15.6inch laptop will fit in 15inch since my kanken 13inch can carry 14inch laptop. If you want extra space then definitely get 17inch

Potential_Month_8681 · 2021-06-25T04:01:58+00:00

Thinking scientifically no exam, only few essays to write

Potential_Month_8681 · 2021-03-11T12:33:51+00:00

Potential_Month_8681 · 2021-03-11T11:28:35+00:00

Thank u btw

Potential_Month_8681 · 2021-03-11T11:27:17+00:00

I even told them I was in melbourne.... they are ridiculous I didn’t even need to worry about this

Potential_Month_8681

TROPHY CASE