BTEB Machinist case studies
BTEB Machinist · Put your knowledge to work in context.
The BTEB Machinist credential sits under the Bangladesh Technical Education Board, the government body whose website publishes results, curricula, syllabi and examination regulations for technical education. The board's page identifies its chairperson and secretary and links to separate result portals for diploma, HSC and SSC level examinations. The BTEB Machinist case studies are 5 cases and about 2,631 words.
1Hacksaw Blade Selection Under a Deadline
A fitter must cut a 40 mm diameter solid mild-steel bar to length before the lathe becomes free at 14:00. The only hacksaws in the store are two frames: one holds 300 mm blades, the other 250 mm blades.
537 words, about 3 min2Micrometer Readings That Do Not Agree
A batch of 25 turned pins is specified as 12.000 ± 0.010 mm. A machinist measures five pins with a 0–25 mm outside micrometer and records 11.996, 11.998, 11.994, 11.997 and 11.995 mm - all within tolerance.
494 words, about 2 min3Taper Turned With the Compound Rest
A lathe operator must turn a taper on a mild-steel shaft: large diameter 30 mm, small diameter 24 mm, over a length of 60 mm. The lathe has a compound (top) slide swivel graduated in degrees and a tailstock offset facility.
499 words, about 2 min4Preventive Maintenance on a Worn Lathe
A centre lathe in a training workshop has developed three symptoms in the same week: a faint rhythmic vibration visible on the finished surface, a slight taper on work that should be parallel, and a growing oil film under the headstock. The maintenance log shows the last lubrication check was four months ago, the apron oil level is at the minimum mark, and the bed ways near the headstock look polished and dry compared with the rest of the bed.
521 words, about 3 min5Bearing Fit, Material Choice and Press Force
A repair job requires a bronze bush to be pressed into a steel housing. The housing bore is 40.000 mm; the bush outside diameter is 40.045 mm, giving 0.045 mm interference.
580 words, about 3 min