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Thread: poor surface finish

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  1. 02-03-2010, 05:11 AM #1
    sinha_nsit
    sinha_nsit is offline Registered
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    poor surface finish

    When I try to turn less than 10 mm dia mild steel rod using a carbide tool (55 deg diamond-shaped, sharp radius), I am not getting good surface finish. It has non-uniform appearance. Any suggestions?
    Thanks.
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  2. 02-03-2010, 07:15 AM #2
    CNCRim
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    what's the RPM? how big is toolnose rad? how fast is your feedrate? Milde steel you can try .01fps
    The best way to learn is trial error.
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  3. 02-03-2010, 12:12 PM #3
    sinha_nsit
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    I have tried several combinations of cutting parameters without satisfactory result. The insert is DCMT 11T304, i.e., with 0.4 mm nose radius. What rpm, depth of cut and feedrate should I use?
    The workpiece is 150 mm long with 10 mm diameter. I have a feeling that there is some vibration due to slenderness of the workpiece.
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  4. 02-17-2010, 04:48 AM #4
    sinha_nsit
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    Yes. It was because of vibration/sharp nose only.
    I tried 250 rpm and 40 mm/min feedrate, with 0.8 mm nose radius. This gives acceptable finish.
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