I have a conventional lathe, where it is having levers for changing the various speeds (from that i can calculate the cutting speed also).
I need how to calculate the feed or feed rate, if the speed of the spindle is 363 rpm for example.
My lathe is not having feed varying lever. It is having only one lever where it can engage with automatic speed, that is varying depend on the speed of the spindle.
Please, I need more information for help you:
1) Type of material to be machining.
2) Diameter of the bar.
3) Material of the tool (High Speed Steel, Hard Metal, etc).
For aluminium, on a conventional lathe, rotational top speed of the mandrel will be a strong limitation, as for carbide tool cutting speed Vc reach 2000 m/min in soft allow (iso N). Thus after having calculate for D diameter in mm apply N=1000Vc/pi/D. For feed rate, take f=ap/10, ap being removed thickness.
Jean sir, Thank you for ur reply
removed thickness/10
what is the value 10 mean here?
Over a conventional lathe I will be use a cutting speed about 100m/min for aluminum alloy and coated carbide. In this case, for 50mm diameter you need 640rpm.
For rough turning you can use f=0,3mm/v, and for finishing f=0,1mm/v.
In the first case the feed speed is 192mm/min, and in the second case 64mm/min.
To complete my answer, Ap=10*f gives a good proportion for chip.
In fact, for your carbide insert, manufacturer gives for cutting face geometry an ap-f diagram (area of good cutting conditions) for chip breaker. The line f=ap/10 reachs the area. Low f will correspond to finishing, high f for roughing.
Machineries Handbook Please purchase and reference this recourse.
The data you present is not much higher than 5% of what's needed for a direct answer.
What is the cutting tool? Material? What stock material? What is the coolant? Cutting lubricant? Rough or finish cut? What finish? Are you cutting above center or drag cut? These are all factors that need to be addressed before making chips. :-) Reference the Machineries Handbook.
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