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“Drill Peck Calculator”.  Calculate Drilling Cycles with Decreasing Peck Amounts & Optional Dwell Points Too!

“Simple Lathe Cam” the Tool Radius Compensating Calculator for CNC Lathes.

“Speeds and Feeds Conversions Calculator” Calculate the Conversions of 16 Speed and Feed Pairs in both Inch and Metric Measurements.

“Sine Bar Calculator”.  Calculate the Gage Blocks Needed to Set-Up an Inspection Sine Bar or Sine Plate.

“Bolt Circle Patterns  Calculator” Easily Calculates “Bolt Circle Patterns” for Full Circles, Partial Circles and even “Polar Point” Patterns!

“Threading Calculator” Calculate the Thread Dimensions of Unified Threads. OD and Internal Threads.

“Center Drill Measurements  Calculator” Provides the Dimensions of Center Drills #00000 to #10 and can Calculate the Program Depth to Obtain a Desired Counter Sink Diameter.

“Metal Weights Calculator”.  Calculate the weights of 13 different Metals and 109 Alloys.

“Angles Conversion Calculator”  Convert Angles into Decimal Form and Convert Decimals into Angles.  You can also Convert Degrees into Radians and Radians into Degrees.

“Right Triangles Calculator” Easily Calculates the Side Lengths and Angles of Right Triangles.

“Hole Position Calculator” Inspection Tool

“Machining Formulas” Reference Guide.  Contains 30+ Formulas for the Machinist!

“Metric Conversions Calculator”  Calculate the Conversions of Metric to Imperial and Imperial to Metric Quickly and Easily.

“Socket Head Cap Screws Reference Guide” Provides the Measurments of Standard and Metric Socket Head Cap Screws.

“Web Machinist” CNC Machinist Software.

“True Position Calculator”

Calculate the True Position of Holes with or without Maximum Material Condition!

Machining Formulas

Cutting Speed Formulas:

RPM = Revolutions Per Minute  

SFM = Surface Feet Per Minute

SMPM = Surface Meters Per Minute

Surface Feet Per Minute (SFM) = 0.262 x Diameter ( Tool or Stock ) x RPM

Revolutions Per Minute (RPM) = 3.82 x SFM ÷ Diameter ( Tool or Stock )

SFM to SMPM = SFM x .3048

SMPM to SFM = SMPM x 3.2808399

Feed Rate Formulas:

RPM = Revolutions per Minute  

IPM = Inches per Minute  

FPR = Feed per Revolution

FPT = Feed per Tooth

T = Number of Teeth in Cutter

MMPR = Millimeters per Revolution

IPR = Inches per Revolution

Inches Per Minute (IPM) = FPT x T x RPM

Feed Per Revolution (FPR) = IPM ÷ RPM

Feed Per Tooth (FPT) = IPM ÷ (RPM x T)

Convert Inches Per Revolution (IPR) to Inches Per Minute (IPM) = IPR x RPM

Convert Inches Per Minute (IPM) to Inches Per Revolution (IPR) = IPM ÷ RPM

Convert Inches Per Revolution (IPR) to Millimeters Per Revolution (MMPR) = IPR x 25.40

Metal Removal Formulas:

TCM = Time Cutting in Minutes

TCS = Time Cutting in Seconds  

IPM = Inches per Minute

MRR = Metal Removal Rate ( Cubic Inches per Minute)

L = Length of Cut

W = Width

D = Depth of Cut

F = Feed in Inches Per Minute

Time Cutting in Minutes (TCM) = L ÷IPM

Time Cutting in Seconds (TCS) = L ÷IPM x 60

Distance Over Time in Minutes (L) = IPM x TCM

Metal Removal Rate (MRR) = W x D x F

Degrees Formulas:

Converting Minutes of a Degree to a Decimal:

Divide Minutes by 60

Example:

35° 42’  

Divide Minutes by 60: 42’ ÷ 60 = .7

Bring Down Degrees: 35.7°

Converting Minutes and Seconds of a Degree to a Decimal:

Divide Seconds then Minutes by 60

Example:

35° 41’ 15”

Divide Seconds by 60: 15 ÷ 60 = .25

Divide Decimal Minutes by 60: 41.25 ÷ 60 = .6875

Bring Down Degrees: 35.6875°

Converting Decimal Degrees to Minutes

Multiply Decimal by 60

Example:

30.7°

Multiply Decimal Degrees by 60: .7 x 60 = 42’

Bring Down Degrees: 30° 42’

Converting Decimal Degrees to Minutes and Seconds

Multiply Decimal Degrees by 60

Example:

30.6875°

Multiply the Degree Decimal by 60: .6875 x 60 = 41.25’

Multiply the Decimal Minutes from Last Calculation by 60: .25 x 60 = 15”

Bring Down Degrees: 30° 41’ 15”

Converting Degrees to Radians

Multiply Degrees by .0174532925 to Obtain Radians

Converting Radians to Degrees

Multiply Radians by 57.29577951 to Obtain Degrees

Drill Point Depth and Countersink Diameter Formulas:

60°

82°

90°

118°

120°

135°

Drill Point Angle:

0.866 X Drill Diameter = Drill Point Length

0.575 X Drill Diameter = Drill Point Length

0.500 X Drill Diameter = Drill Point Length

0.300 X Drill Diameter = Drill Point Length

0.288 X Drill Diameter = Drill Point Length

0.207 X Drill Diameter = Drill Point Length

Use the formulas below to calculate the drill point length for various drill point angles:

Note: you can also substitute the drill diameter with a desired countersink diameter to calculate the depth of cut to make a desired countersink.

Also check out Tapping and Threading Formulas….Click Here

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Web Machinist Software:

To Purchase “Web Machinist 4.2” Please Click Here

“Angles Conversion Calculator”  Convert Angles into Decimal Form and Convert Decimals into Angles.  You can also Convert Degrees into Radians and Radians into Degrees.

“Speeds and Feeds Conversions Calculator” Calculate the Conversions of 16 Speed and Feed Pairs in both Inch and Metric Measurements.

“Machining Formulas” Reference Guide.  Contains 30+ Formulas for the Machinist!

Need the formula to check True Position?  Go Here

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“Speeds and Feeds Conversions Calculator” Calculate the Conversions of 16 Speed and Feed Pairs in both Inch and Metric Measurements.

Speeds & Feeds Conversions Calculator for Windows