FIELD: technological equipment meant to test inner diameter of tubes of various types and dimensions. SUBSTANCE: bed includes base 1, position 2 to gauge tubes, gauge 5 made fast to flexible tie-rod 6 coupled to drive of reciprocating motion mechanism. Flexible tie-rod 6 is located in guides 4, 7. Mechanism of reciprocating motion of flexible tie-rod 6 has pulley 8 with recess, pressing rollers 10, tension facilities 11, drive of rotation of pulley 8. EFFECT: reduced dimensions and usage of metal for manufacture of bed. 5 cl, 4 dwg
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