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STEP-NC Explorer

The Step-NC Explorer tool by Step Tools Inc. helps determine the resolution order for linear distance tolerances in AP-238. It allows for the correction of tolerances and the machining of parts based on the defined tolerances.

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STEP-NC Explorer

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  1. STEP-NC Explorer Determining a resolution order for Linear Distance Tolerances STEP Tools, Inc. 14 First Street, Troy, NY 12180 (518) 687-2848 / (518) 687-4420 fax http://www.steptools.com

  2. Tolerances in AP-238 • The Part Properties pane shows the tolerances defined on the part in CAD. Tolerances defined for the workpiece Toleranced faces are highlighted Rawpiece and fixture can be toleranced

  3. Machining in AP-238 • The workplan pane shows the faces machined by each tool path Cutting tool for workingstep one Face being machined Workingstep one selected

  4. Tool offsets • The Tool property pane shows the tool wear compensation values programmed for each tool Tool T1 affects two linear tolerances Tool T2 affects one linear tolerance

  5. Correcting the tolerances • Distance tolerance measures can be stacked • We can correct the depths of face 1 and face 2 • We need to make both faces in tolerance • We need to correct face 1 then face 2 machined face 1 Top counter bore 5 +0.05 -0.01 18 +0.1 -0.2 hole machined face 2

  6. How – 1 Associate faces to features CAM system writes face data to STEP-NC file Algorithm finds closest faces using path geometry Or user picks

  7. 2. Associate tolerances to operations Tool 1 machines one face of this tolerance And Tool 1 machines one face of this tolerance And Tool 2 machines the other face of this tolerance

  8. 3. Tolerances affected by each tool Linear distance 18 +0.1 – 0.2mm Measured value = 20mm Linear distance 5 +0.05 – 0.01mm Measured value = 4mm

  9. 4. Corrections to offsets Correction of 2mm fixes the 18 (20mm) error Correction of 3mm fixes the 18 (20) mm error and the 5 (4) mm errror

  10. General Solution • Phase 1 determine association between machining features and design tolerances. • Phase 2 determine an ordering for tolerance correction (tolerance stack). • Phase 3 recommend a best new value for each offset. • Phase 4 allow the user to fine tune the recommended offsets. • Phase 5 use the new offsets to machine the part.

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