Page 223 - Parlec Catalog

Technical Information

Roughing Speeds, Feed Rates & Machining Allowance 221

RECOMMENDED ROUGHING SPEEDS

STEELS

Material BHN TT / SN VN CT 330BHN = Rc: 35
CARBON STEEL C = 0.15% 125 300-450 600-800 650-1000 250BHN = Rc: 24-25
CARBON STEEL C = 0.35% 150 300-500 600-800 625-950 220BHN = Rc: 20
CARBON STEEL C = 0.70% 180-250 250-450 550-750 500-750
ALLOY STEEL 4000 125-200 300-500 550-750 500-750
ALLOY STEEL 5000 225 200-400 350-525 300-600
ALLOY STEEL 8000 300 200-400 300-525 350-475
STAINLESS STEEL, ANNEALED 400 SERIES 150-270 250-400 400-600 475-750
STAINLESS STEEL, ANNEALED 300 SERIES 150-220 300-425 350-500 550-650
CAST STEEL, LOW CARBON 150 200-325 450-650 400-550
CAST STEEL, LOW ALLOY 150-250 200-300 250-400 300-425
All values are in SFM.
OTHER MATERIALS

Material BHN TT / SN AL / VN AS C2
MALLEABLE CAST IRON, FERRITIC 110-150 525-700 600-1000 400-900 150-350
MALLEABLE CAST IRON, PEARLITIC 150-270 250-400 400-800 300-800 100-250
GREY CAST IRON, LOW TENSILE 150-220 525-800 400-900 300-1000 200-400
GREY CAST IRON, HIGH TENSILE 200-330 350-600 400-700 300-600 150-300
NODULAR IRON, FERRITIC 125-230 300-500 400-900 450-900 150-375
NODULAR IRON, PEARLITIC 200-300 250-400 400-900 350-650 100-250
ALUMINUM ALLOYS 30-120 - - - 600-1200
ALUMINUM ALLOYS, CAST 100-130 - - - 600-1200
All values are in SFM.

ALLOWANCE & FEED RATES
Feed Rates
Machining Allowance on diameter (Inches) DOC (IPR)*
For Best
Twin Boring Head Material Optimum Min. Max. Finish Min. Max.
Steels .10 .02 .14 .010 .008 .014
PC2-4205 (.94 – 1.34) Cast Iron .16 .02 .24 .010 .006 .012
Aluminum .12 .02 .24 .010 .006 .012
Steels .12 - .14 .04 .16 - .18 .014 .012 .018
PC3-4305 (1.26 – 1.70) Cast Iron .20 .04 .28 .012 .008 .016
Aluminum .20 .04 .28 .014 .012 .018
Steels .14 - .16 .04 .18 -.20 .014 .012 .020
PC4-4405 (1.58 – 2.17) Cast Iron .24 .04 .31 .012 .012 .016
Aluminum .24 .04 .31 .014 .008 .018
Steels .24 .06 .35 - .47 .018 .012 .024
PC5-4505 (2.06 – 3.30) Cast Iron .39 .04 .55 .016 .012 .018
Aluminum .39 .06 .55 .018 .008 .024
Steels .28 - .39 .06 .35 - .47 .018 .012 .024
PC6-4605 (2.61 – 6.00) Cast Iron .47 .04 .55 .016 .008 .018
PC6-4606 & PC7-4705
Aluminum .47 .04 .55 .018 .016 .024
Steels .28 - .39 .06 .35 - .47 .018 .012 .024
ALL BIG BORE ABOVE 6.00 Cast Iron .47 .04 .55 .016 .008 .018
Aluminum .47 .04 .55 .018 .016 .024
*Feed rate is based on two cutting edges. When step cutting, multiply by .5.

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