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no edit summary
== Positioning your work ==
== Positioning your work ==
== Feeds and speeds==
== Feeds and speeds==
===Drilling===
Cutting Speed [CS] is based on Surface Feet per Minute [FPM or SFM].
RPM = (Cutting Speed(ft/min) x 12/1(in/fr))/Diameter of Cutter(in) x pi
RPM = (Cutting Speed(ft/min) x 12/1(in/fr))/Diameter of Cutter(in) x pi<br>
RPM = (12CS)/(pixD)
RPM = (12CS)/(pixD)<br>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<CAPTION ALIGN=TOP>Material and Cutting Feed</CAPTION>
<CAPTION ALIGN=TOP>Material and Cutting Feed</CAPTION>
<TR><TD>Material </TD><TD>Cutting Speed (FPM)</TD></TR>
<TR><TD>Material </TD><TD>Cutting Speed (FPM)</TD></TR>
<TR><TD>Aluminum </TD><TD ALIGN=CENTER>300</TD></TR>
<TR><TD>Aluminum </TD><TD ALIGN=CENTER>300</TD></TR>
</TABLE>
</TABLE>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<CAPTION ALIGN=TOP>Drilling Feeds</CAPTION>
<CAPTION ALIGN=TOP>Drilling Feeds</CAPTION>
<TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR>
<TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR>
</TABLE>
</TABLE>
Example<br>
Example:
1/2 in drill, Low Carbon Steel
1/2 in drill, Low Carbon Steel<br>
Dia = 0.50
Dia = 0.50<br>
Material LCS : 90
Material LCS : 90<br>
RPM = 12CS/pi*D = 12*90/.5pi = 2160/pi = 687.5<br>
RPM = 12CS/pi*D = 12*90/.5pi = 2160/pi = 687.5<br>
Feed = .004-.007<br>
Feed = .004-.007<br>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<TR><TD>Answer:</TD><TD>687.5 RPM </TD></TR>
<TR><TD>Answer:</TD><TD>687.5 RPM </TD></TR>
<TR><TD> </TD><TD>.004-.007 in. per Rev</TD></TR>
<TR><TD> </TD><TD>.004-.007 in. per Rev</TD></TR>
</TABLE>
</TABLE>
===REAMING===
Speed - 1/2 - 1/3 the speed for drilling
Feed - 2-3 times the feed for drilling
===MILLING===
RPM = (12CS)/(pixD)
Feedrate = RPMxfxn<BR>
Feedrate = RPMxfxn<BR>
n = number of teeth<BR>
n = number of teeth<BR>
f = feed per tooth<BR>
f = feed per tooth<BR>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<CAPTION ALIGN=TOP>Cutting Speed</CAPTION>
<CAPTION ALIGN=TOP>Cutting Speed</CAPTION>
<TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR>
<TR><TD>Drill Dia.(in)</TD><TD>Feed per Revolution(in) </TD></TR>
<TR><TD>Medium Alloy Steel </TD><TD>40-70 </TD><TD>150-350 </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>
<TR><TD>Stainless Steel </TD><TD> 30-80 </TD><TD>100-300 </TD><TR>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<CAPTION ALIGN=TOP>Feeds for End Mills (feed per tooth)</CAPTION>
<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>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>
Example - 0.50 in HSS two flute end mill cutting aluminum<BR>
Example - 0.50 in HSS two flute end mill cutting aluminum<BR>
RPM = 12CS/piD = 12x300/.5pi = 2292 RPM<BR>
RPM = 12CS/piD = 12x300/.5pi = 2292 RPM<BR>
RPM = 12CS/piD = 12x800/.5pi = 6112 RPM<BR>
RPM = 12CS/piD = 12x800/.5pi = 6112 RPM<BR>
Feedrate = RPMxfxn = 2292x.005x2=23 IPM<BR>
Feedrate = RPMxfxn = 2292x.005x2=23 IPM<BR>
Feedrate = RPMxfxn = 6112x.005x2=61 IPM<BR>
Feedrate = RPMxfxn = 6112x.005x2=61 IPM<BR>
<TABLE>
<TABLE>
<table border="1">
<table border="1">
<CAPTION ALIGN=TOP>Answer:</CAPTION>
<CAPTION ALIGN=TOP>Answer:</CAPTION>
<TR><TD>RPM Range: </TD><TD>2292 - 6112 RPM</TD></TR>
<TR><TD>RPM Range: </TD><TD>2292 - 6112 RPM</TD></TR>
<TR><TD>Feedrate Range:</TD><TD> 23 - 61 IPM </TD></TR>
<TR><TD>Feedrate Range:</TD><TD> 23 - 61 IPM </TD></TR>