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  1. #16
    Join Date
    Jun 2007
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    sydney ( st marys )
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    64
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    4,887

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    You will probably find that on mills you will find feed rates in inches/minute,due mainly to the fact that there feed mechanism is inpependant of the main drive shaft (not working through gears).

  2. #17
    Join Date
    Mar 2007
    Location
    Canberra
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    67
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    That's what was confusing me. I understand the relationship now.
    I've come to grips with SFM, diameters and RPM and have been trying to understand feed rates on both the mill and the lathe. All I've been doing so far is unscientifically using a feed rate that I thought may be about right. Not having any experience with using the correct feed rates makes it a bit hard to judge if what I was doing was correct. Now I understand that and have a formula I can calc it so I know what I should be doing.

  3. #18
    Join Date
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    sydney ( st marys )
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    When it comes to useing the lathe the feed rates are quite often dependant on rigidity of machine,type of tooling.method of work holding and material being machined.
    Another consideration to think of when working out feed rates is the nose radious of the tool particularly when using tiped tools,generally the bigger the nose radious the higher the feed rate,I my self try for .002-.004 when using .04 and tips ,and .004-,008 when using .08 tips.
    You will soon see how the lathe likes the feed rates if it starts to bog down or vibrate you may have to play with the feed rates untill you reach a happy medium,a lot of it can be trial and error when using smaller HP machines.
    Using HSS can be another ball game alltogether.

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