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One page. Speeds, chip load and drill feed, imperial and metric.
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BuySine Bar / Sine Plate Angle Calculator
Stack height ↔ angle with gauge-block suggestions
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Machining Job Estimator
Quote shop work and check operations against your spindle's top speed.
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Card, 27-page guide and the estimator workbook. All six files.
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Precision Tools for Sine Bar Setup
CSV-sourced shop tools for the hybrid workflow: rough the angle, indicate the bar, and verify stack height
Klein Tools 935DGGP Digital Angle Gauge
Magnetic-base digital angle gauge for rough fixture and sine-plate setup. Get close in seconds, then verify critical print angles with the sine bar and a known stack.
View on Amazon →Dial Indicator Set with Magnetic Base
Indicate the top face of the sine bar after you seat it. Rock, taper, or a chip under a roller shows up here before you trust the calculated angle.
View on Amazon →Starrett Electronic Slide Caliper 0–6 in
Sanity-check overall stack height and roller center distance on the job. Not a substitute for wringing + a mic on the last digits, but it catches a missed 0.500" block immediately.
View on Amazon →Mitutoyo 103-177 Outside Micrometer, 0–1"
Verify the small/last-digit blocks and wear pieces after wringing. Use it on the 0.001" and 0.0001" series before they go into a taller stack.
View on Amazon →GEARWRENCH 161D 32-Blade Feeler Gauge Set
Check for daylight under a roller or a poorly seated stack before you indicate. A feeler that slides under the high roller means the setup is not on the plate.
View on Amazon →As an Amazon Associate, TestTalkHQ earns from qualifying purchases.
How to Use This Sine Bar Calculator
Solve for Stack Height
Enter the sine bar length and the target angle in degrees, minutes, and seconds. The calculator returns H = L × sin(θ) and a largest-first gauge-block combination from an 81- or 83-piece set so you can build the stack without hunting the chart.
Solve for Angle
When you already know the stack height under the bar — measured with a micrometer or built from known blocks — switch modes to get θ = arcsin(H / L) in decimal degrees and DMS.
Why L Matters
L is the center-to-center distance between the sine bar rollers (or sine plate cylinders), not the overall bar length. Use the stamped center distance on the tool — typically 5.000" or 10.000" on shop bars.
After You Calculate
Wring the suggested blocks, seat them under one roller on a clean surface plate, and indicate or probe the top of the bar or workpiece. See the Sine Bar Setup Guide for wringing and plate technique.
Sine Bar Angle Calculator FAQ
What stack height do I need for 30° on a 5" sine bar?
H = 5 × sin(30°) = 5 × 0.5 = 2.5000 inches. A typical 81-piece suggestion is 2.000 + 0.500.
Can I use a sine plate the same way?
Yes. The math is identical — use the plate's roller center distance as L. Sine plates often include a magnetic chuck on top for holding the workpiece while you mill or grind to the set angle.
Why isn't my angle matching the calculator?
Common causes: dirty wringing faces, bare-hand thermal growth on blocks, worn rollers, a dirty surface plate, or using overall bar length instead of roller center distance. Walk through Sine Bar Troubleshooting.
When should I use a digital angle gauge instead?
Digital gauges are faster for rough setup and non-critical fixtures. Reach for the sine bar when the print needs arc-minute-class accuracy or when you are setting a grind/mill angle that must hold under cutting load. Compare both in Sine Bar vs Digital Angle Gauge.