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→Feeds and speeds
== 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>