OUR QUALITY VISION

Quality Control Department

Equipped with Plug and Ring Guages, Micrometers, Vernier Caliper, Dial Caliper, Dial Gauges, Feeler Gauges, Surface Plate, Straight edges, Slip Gauges, Sound Level Meter, Sound Level Calibrator, Hardness Tester, Temperature Meter, Crack Detector, Tachometer, Surface tester, Optical flat, Pitch Comparator, Screw Pitch Micrometer, Bench Center, Frame Level (L.C. 0.02 mm / mt)

Organization

The quality control and Inspection department functions independently under the guidance of a manager and compromise of Quality Control Engineer and team of Inspectors.
The Q.C. department controls the Quality by carrying out inspection of incoming raw materials, brought out components and at all stages of manufacturing till the dispatch of the machine.

Raw Material Control

All incoming raw material such as C.I. Castings, Steel, Non- Ferrous materials etc., are tested / checked on 100% basis for physical properties and chemical composition as per standard specifications.
The materials are inspected / tested for visible defects, hardness, tensile strength, equipped with material testing facilities such as, Rockwell Hardness, tester, Universal hardness tester, Electromagnetic crack detector and D.P. test.
All non-confirming materials are rejected and returned to the suppliers.

Control of brought of Components

All brought out components are inspected before using them, Components not confirming to specification are rejected and returned to the suppliers. Inspection is done with respect to standard specification and drawings. Critical components are checked on 100% basis and non-critical components are checked on sampling basis.
Electrical components, equipments, bearing, fasteners etc., purchased are of reputed make.

Packing Controls

After final inspection and test of the machine, it is ensured that the machine is well protected till dispatch.
Packing of the machine is checked and ensured that it is made strong, sturdy and weather proof to provide protection against damage, dust etc. during transit.

Metrology Controls

The Q.C. department is well equipped with a variety of precision measuring gauges are done; it dusts proof and has controlled temperature.
Standards such as slip blocks, optical flats, comparatives are used for calibration.
All worn out, defective and damage gauges etc. are discarded.

Quality Records

Records are kept for inspection / testing carried out during all storage of manufacturing the machine i.e. from incoming raw material up to dispatch of the machine.

TEST CHART

WE INSPECT THE LATHE MACHINES ACCORDING TO THE TEST CHART

BHARAT MACHINE TOOLS, JAMNAGAR OBSERVATION SHEET ( For G.P. Lathe, R.e.f. I.S. 1878 (P.1) 1983

Model____________                     Bed No._____________                     Elec. Motor No._____________

Machine No. ___________________                   ACCURACY TEST (All Dimensions are in mm)

Date ______________________

Sr No
TEST
PERMISSIBLE DEVIATIONS
ACTUAL ERROR
01

Straightness of carriage slide ways.

  • In longitudinal direction.
  • In transverse direction.

a) DC < 500 : 0.01
    500 < DC < 1000 : 0.02 ( Convex )
    DC < 1000 : 0.03
b) 0.04 / 1000

  
02

Straightness of carriage movement in Horizontal plane.

a) DC < 500 : 0.01
    500 < DC < 1000 : 0.02
    DC < 1000 : 0.03

  
03

Difference in height between headstock and tailstock centre.
0.04 Tailstock centre higher than headstock centre.
  
04

Parallelism of tailstock movement to Carriage movement.

  • In horizontal plane.
  • In vertical plane.

c) Both for (a) and (b)
    DC < 1500 0.03
    DC > 1500 0.04

  
05

a) Axial slip.
b) Camming of face plate mounting Surface.

a) 0.01
b) 0.02

  
06
 Run out of spindle nose. a) 0.01  
07

True running of taper bore of spindle

  • Near nose
  • At distance

a) 0.01
b) 0.02 for 300

  
08

Parallelism of spindle axis to carriage Movement.

  • In horizontal plane
  • In vertical plane

a) 0.015/300, end of mandrel inclined
    towards tool.
b) 0.02/300 end of mandrel inclined
    upwards.

  
09
 Run out of main spindle.

a) 0.015

  
10

Parallelism of external surface of tailstock Sleeve to carriage movement.

  • In horizontal plane
  • In vertical plane

a) 0.015/300, end of sleeve inclined
    towards tool.
b) 0.02/100 end of mandrel inclined
    upwards.

  
11

Parallelism of taper bore of tailstock sleeve to carriage movement.

  • In horizontal plane
  • In vertical plane

a) 0.03/300 end of mandrel inclined
    towards tool.
b) 0.02/300 end of mandrel inclined
    upwards.

  
12

Parallelism of longitudinal movement to tool slide to spindle axis.

a) 0.04/300 end mandrel inclined
    upwards

  
13
Square ness of transverse movement of tool slide to spindle axis.

a) 0.02/300 slide

  
14
 Axial slip of lead screw.

a) 0.015

  
15
 Lead screws pitch error.

a) 0.04/300 max. 0.05
b) 0.015

  
16

Turning of test pieces.

  • a) Roundness
  • b) Cylindricity larger dia is near the HS

a) 0.01
b) 0.015

  
17
 Facing of test piece.

a) 0.025/300

  
18
 Thread cutting pitch-accuracy.

a) 0.04/300 max. 0.05
b) 0.015/50

  
19

Hardness of bed.

  • a) Unhardened
  • b) Flame hardened

a) 180 BHN min.
b) 300 BHN min.

H.S
T.S