Red Seal Machinist case studies
Red Seal Machinist · Put your knowledge to work in context.
The Red Seal Machinist credential (Trade 429A) is the interprovincial endorsement a working machinist earns after passing the Red Seal examination and completing the required apprenticeship or trade-qualification pathway in a Canadian province or territory. It signals that you can plan and carry out machining work to the tolerances and finish requirements found in job shops, production plants, toolrooms and maintenance departments, and that your skills are recognized across jurisdictions that participate in the Red Seal Program. The Red Seal Machinist case studies are 5 cases and about 2,962 words.
1Slender Shaft Chatter and Mid-Span Undersize on a Manual Lathe
A 1045 cold-drawn shaft 600 mm long must finish at Ø36.00 ±0.02 mm with Ra 1.6 µm. It is held in a 3-jaw chuck with about 45 mm in the jaws and supported at the tailstock with a live centre; no steady rest is used.
705 words, about 4 min2Corner Chatter and Wall Taper in a 6061 Pocket
On a 3-axis vertical CNC mill, a 120 mm × 80 mm × 12 mm deep pocket is roughed and finished in 6061-T6 using a 12 mm 3-flute solid carbide end mill with a 45° helix and 30 mm length of cut, held in an ER32 collet with 45 mm overhang. The program uses 300 m/min, 0.05 mm/tooth, 6 mm axial depth, 6 mm radial width, climb milling and flood coolant.
626 words, about 3 min3Grinding Burn and Cracks in Hardened A2 Tool Steel
An A2 tool steel block 150 × 100 × 20 mm, hardened and tempered to 60-62 HRC, must be surface ground to 20.00 ±0.01 mm, flatness 0.005 mm and Ra 0.2 µm. The wheel is WA46K8V, 200 mm diameter, run at 32 m/s.
540 words, about 3 min4Uniform Hole Offset and MMC Bonus on a CNC-Bored Plate
A 6061-T6 fixture plate has four Ø10.00-10.10 mm holes on a 100 × 80 mm rectangular pattern. The drawing calls out position Ø0.25 Ⓜ to datum A (bottom face), B and C (two perpendicular edges).
551 words, about 3 min5Work Hardening in 304 Stainless Drilling and Bandsaw Blade Failure
In a job shop, 40 through-holes Ø12.0 mm are required in 16 mm thick 304 stainless plate. The machinist uses a standard HSS jobber drill with a 118° point in a drill press at 12 m/min and 0.10 mm/rev, with a dab of tapping fluid applied by brush.
540 words, about 3 min