Shopbot User Tips: Difference between revisions
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== 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 | RPM = (12CS)/(pixD) | ||
RPM = (12CS)/(pixD) | |||
<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> | ||
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<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> | ||
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</TABLE> | </TABLE> | ||
Example | Example: | ||
1/2 in drill, Low Carbon Steel | |||
1/2 in drill, Low Carbon Steel | |||
Dia = 0.50 | |||
Dia = 0.50 | Material LCS : 90 | ||
Material LCS : 90 | |||
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> | ||
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<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> | ||
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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> | ||
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<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> | ||
