hi all ,
would like to know when doing helical ramping , do I maintain the same feed and speed as of normal milling conditions ? or do I need to slow down either speed or feed or even both? also by how many percent usually ?
thanks
regards
bryan
My rule of thumb is to cut feed rate at half and start from there. Honestly there are so many variables that factor in this. Depends on what metal your cutting, and performance of the cutter your using being the main two.
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Generally I know the insert and tool holder ramp angles as well as speed and feeds by looking them up initially. None of my tooling is lacking that data. That data should not be missing and I wouldn’t buy a tool without it. Lacking that data I would reduce all variables (as mentioned) as a test, but quickly increase the overrides.
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You take your linear federate or LFR * (Dia of your Ramp - Tool Dia)/ Ramp Dia. There is a very good Haas tip of the day on this with Mark Terryberry.
Ex
lFR = 20IPM
Ramp Dia = .625
Tool Dia = .5
20(.625-.5)/.625=4IPM.
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Here is the link to the Haas Tip of the Day
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