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| == Positioning your work == | | == Positioning your work == |
| == Feeds and speeds== | | == Feeds and speeds== |
| + | <html> |
| + | <head> |
| + | |
| + | <title>Cutting</title> |
| + | </head> |
| + | <body> |
| + | |
| + | <h1>Cutting Speed<br> |
| + | <h2>Drilling<Br> |
| + | <h3>Cutting Speed [CS] is based on Surface Feet per Minute [FPM or SFM].<br> |
| + | RPM = (Cutting Speed(ft/min) x 12/1(in/fr))/Diameter of Cutter(in) x pi<br> |
| + | RPM = (12CS)/(pixD)<br> |
| + | <BR> |
| + | |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <CAPTION ALIGN=TOP>Material and Cutting Feed</CAPTION> |
| + | <TR><TD>Material </TD><TD>Cutting Speed (FPM)</TD></TR> |
| + | <TR><TD>Low Carbon Steel </TD><TD ALIGN=CENTER>90 </TD></TR> |
| + | <TR><TD>Alloy Steel SAE 4140</TD><TD ALIGN=CENTER>50 </TD></TR> |
| + | <TR><TD>Cast Iron</TD><TD ALIGN=CENTER>70 </TD></TR> |
| + | <TR><TD>Aluminum </TD><TD ALIGN=CENTER>300</TD></TR> |
| + | </TABLE> |
| + | <BR> |
| + | <BR> |
| + | <BR> |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <CAPTION ALIGN=TOP>Drilling Feeds</CAPTION> |
| + | <TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR> |
| + | <TR><TD>under 1/8 </TD><TD ALIGN=CENTER>.001 to .002</TD></TR> |
| + | <TR><TD>1/8 to 1/4 </TD><TD ALIGN=CENTER>.002 to .004</TD></TR> |
| + | <TR><TD>1/4 to 1/2 </TD><TD ALIGN=CENTER>.004 to .007</TD></TR> |
| + | <TR><TD>1/2 to 1 </TD><TD ALIGN=CENTER>.007 to .015</TD></TR> |
| + | <TR><TD>over 1 </TD><TD ALIGN=CENTER>.015 to .025</TD></TR> |
| + | </TABLE> |
| + | |
| + | Example<br> |
| + | <br> |
| + | 1/2 in drill, Low Carbon Steel<br> |
| + | <br> |
| + | Dia = 0.50<br> |
| + | Material LCS : 90<br> |
| + | <br> |
| + | RPM = 12CS/pi*D = 12*90/.5pi = 2160/pi = 687.5<br> |
| + | Feed = .004-.007<br> |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="45"> |
| + | <COL width="170"> |
| + | <TR><TD>Answer:</TD><TD>687.5 RPM </TD></TR> |
| + | <TR><TD> </TD><TD>.004-.007 in. per Rev</TD></TR> |
| + | </TABLE> |
| + | |
| + | <H2>REAMING<BR> |
| + | <H3>Speed - 1/2 - 1/3 the speed for drilling<BR> |
| + | <H3>Feed - 2-3 times the feed for drilling<BR> |
| + | |
| + | <H2>MILLING<BR> |
| + | <H3>RPM = (12CS)/(pixD)<BR> |
| + | <BR> |
| + | Feedrate = RPMxfxn<BR> |
| + | n = number of teeth<BR> |
| + | f = feed per tooth<BR> |
| + | <BR> |
| + | |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <CAPTION ALIGN=TOP>Cutting Speed</CAPTION> |
| + | <TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR> |
| + | <TR><TD>Material </TD><TD>High Speed Steel</TD><TD>Cemented Carbide</TD><TR> |
| + | <TR><TD>Aluminum </TD><TD>300-800 </TD><TD>1000-2000 </TD><TR> |
| + | <TR><TD>Brass </TD><TD>200-400 </TD><TD>500-800 </TD><TR> |
| + | <TR><TD>Bronze </TD><TD> 65-130 </TD><TD>200-400 </TD><TR> |
| + | <TR><TD>Cast Iron </TD><TD> 50-80 </TD><TD>250-350 </TD><TR> |
| + | <TR><TD>Low Carbon Steel </TD><TD> 60-100 </TD><TD>300-600 </TD><TR> |
| + | <TR><TD>Medium Carbon Steel</TD><TD> 50-80 </TD><TD>225-400 </TD><TR> |
| + | <TR><TD>High Carbon Steel </TD><TD> 40-70 </TD><TD>150-250 </TD><TR> |
| + | <TR><TD>Medium Alloy Steel </TD><TD>40-70 </TD><TD>150-350 </TD><TR> |
| + | <TR><TD>Stainless Steel </TD><TD> 30-80 </TD><TD>100-300 </TD><TR> |
| + | |
| + | |
| + | |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <CAPTION ALIGN=TOP>Feeds for End Mills (feed per tooth)</CAPTION> |
| + | <TR><TD>Cutter</TD><TD>Al. </TD><TD>Brass</TD><TD>Bronze</TD><TD>Cast </TD><TD>Low </TD><TD>Med </TD><TD>High </TD><TD>Stainless</TD><TR> |
| + | <TR><TD>Dia. </TD><TD>----</TD><TD>-----</TD><TD>------</TD><TD>Iron </TD><TD>Carbon</TD><TD>Carbon</TD><TD>Carbon</TD><TD>Steel </TD><TR> |
| + | <TR><TD>------</TD><TD>----</TD><TD>-----</TD><TD>------</TD><TD>-----</TD><TD>Steel </TD><TD>Steel </TD><TD>Steel </TD><TD>---------</TD><TR> |
| + | <TR><TD>1/8 </TD><TD>.002</TD><TD>.001 </TD><TD>.0005 </TD><TD>.0005</TD><TD>.0005 </TD><TD>.0005 </TD><TD>.0005 </TD><TD>.0005 </TD><TR> |
| + | <TR><TD>1/4 </TD><TD>.002</TD><TD>.002 </TD><TD>.001 </TD><TD>.001 </TD><TD>.001 </TD><TD>.001 </TD><TD>.0005 </TD><TD>.001 </TD><TR> |
| + | <TR><TD>3/8 </TD><TD>.003</TD><TD>.003 </TD><TD>.002 </TD><TD>.002 </TD><TD>.002 </TD><TD>.002 </TD><TD>.001 </TD><TD>.002 </TD><TR> |
| + | <TR><TD>1/2 </TD><TD>.005</TD><TD>.003 </TD><TD>.003 </TD><TD>.0025</TD><TD>.003 </TD><TD>.002 </TD><TD>.001 </TD><TD>.002 </TD><TR> |
| + | <TR><TD>3/4 </TD><TD>.006</TD><TD>.004 </TD><TD>.003 </TD><TD>.003 </TD><TD>.004 </TD><TD>.003 </TD><TD>.002 </TD><TD>.003 </TD><TR> |
| + | <TR><TD>1 </TD><TD>.007</TD><TD>.005 </TD><TD>.004 </TD><TD>.0035</TD><TD> .005 </TD><TD>.003 </TD><TD>.003 </TD><TD>.004 </TD><TR> |
| + | <TR><TD>1 1/2 </TD><TD>.008</TD><TD>.005 </TD><TD>.005 </TD><TD>.004 </TD><TD>.006 </TD><TD>.004 </TD><TD>.003 </TD><TD>.004 </TD><TR> |
| + | <TR><TD>2 </TD><TD>.009</TD><TD>.006 </TD><TD>.005 </TD><TD>.005 </TD><TD>.007 </TD><TD>.004 </TD><TD>.003 </TD><TD>.005 </TD><TR> |
| + | |
| + | Example - 0.50 in HSS two flute end mill cutting aluminum<BR> |
| + | <BR> |
| + | RPM = 12CS/piD = 12x300/.5pi = 2292 RPM<BR> |
| + | RPM = 12CS/piD = 12x800/.5pi = 6112 RPM<BR> |
| + | <BR> |
| + | Feedrate = RPMxfxn = 2292x.005x2=23 IPM<BR> |
| + | Feedrate = RPMxfxn = 6112x.005x2=61 IPM<BR> |
| + | |
| + | <TABLE> |
| + | <table border="1"> |
| + | <COL width="190"> |
| + | <COL width="190"> |
| + | <CAPTION ALIGN=TOP>Answer:</CAPTION> |
| + | <TR><TD>RPM Range: </TD><TD>2292 - 6112 RPM</TD></TR> |
| + | <TR><TD>Feedrate Range:</TD><TD> 23 - 61 IPM </TD></TR> |