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PROFESSIONAL ADVICE PROFESSIONAL ADVICE

● check the quality of the Table 1.
automatic lubrication of the guides Grinding defects on the BRH 20A II.
of the table travel and the vertical
Defect repair method
Nature of the defect
stroke of the grinding head; Long, regular layered pads 1. Check the balancing of the grinding
● check on the control panel ("Chess board") wheel.
the operation of signaling devices The reason is vibration: 2. Check the tightening of the nuts on the
of the zero position of the grinding - imbalance of the grinding wheel; base plate el. engine and drive belt tension.
head; - vibration of the electric motor, incl. 3. Adjust the clearance in the bearings of
● adjust the longitudinal excessive tension of drive belts; the spindle of the grinding head.
feed of the table and, if necessary, - radial (axial) runout of the spindle; Note. Spindle bearing clearance can only be
- high feed rate;
adjusted by a qualified technician.
the transverse feed of the grinding - defect of the bearings of the spindle of 4. Reduce feed rate. The optimum speed is
head. the grinding headstock. 10-15 m / min.
5. Replace defective bearing.
AFTER ACTIVATION OF THE Note. The operation according to claim 5 is
MACHINE: performed only by a qualified fitter.
● check the operation of the Narrow, irregular and relatively deep risks. Smooth the grinding wheel with a blunt
hydraulic unit pump; The reason is a rough, loose grinding diamond at low speed and low feed.
● check the serviceability wheel. If editing is not possible, replace the circle.
of manual control of the table and
grinding head; Isolated deep risks. 1. Edit the grinding wheel with the
● check the operation of Causes: appropriate diamond. After editing, clean
- decomposition of the binder of the
the travel lock of the grinding grinding wheel, the circle with a metal brush and rinse with
a stream of water.
headstock with the limit - high feed rate. 2. When using a grinding wheel with an
switch; organic binder, do not use coolant with
● check the operation of soda ash.
the suction system of grinding 3. Reduce feed rate.
(abrasive) dust;
● check the operation of Transverse "waves". Round off the grinding wheel with a
the coolant supply system. The reason is torn edges of the grinding mandrel.
wheel.
WEEKLY: Irregular risks.
● check the pressure in The reason is unclean coolant.
the hydraulic system using a
manometer in test mode; Irregular risks. 1. Clean the coolant tank of dirt and solids.
● check the oil level in The reason is unclean coolant. 2. Eliminate drafts in the room where the
the hydraulic unit tank; machine is installed.
3. Check the operation of the magnetic dirt
● Lubricate (using a cleaner (separator) to capture mechanical
grease nipple) the bearings of impurities from the coolant tank.
the machine control levers. Deep wrong risks. 1 Tighten the adapter flange screws.
Before cleaning (flushing) the dirt trap, the drive motor and gearbox The reason is the loosening of the 2. Check the condition of the gaskets at the
ONCE TIME IN THREE must be separated from it. Before reinstalling the gearbox, replace tightening screws of the adapter flanges of ends of the grinding wheel and between the
MONTHS, change the oil in the the oil in it. the grinding wheel. wheels when they are doubled.
grinding head. After draining The brand of oil is And 20A. Oil level control is the Pollution (salting) of the grinding wheel. 1. Use a larger grinding wheel.
the old oil, pour kerosene into middle of the inspection window. Causes: 2. Use a sharper diamond when dressing
the grinding headstock and - use of a grinding wheel with fine grain; the grinding wheel.
turn on the grinding wheel for ONCE A YEAR, make a complete oil change in the hydraulic - poor-quality dressing of the grinding 3. Adjust the coolant stream to the full
one minute. Then drain the system with the replacement of the filter element of the oil wheel; width of the grinding wheel.
- improper cooling of the grinding wheel.
kerosene and add fresh oil. An filter and cleaning the suction box. The level of the new refill The appearance of colored spots on the 1. Change the grinding mode.
analogue of Czechoslovakian oil of the I 20A brand (130 l) should be checked by the upper grinded part. 2. Check the tightening of the grinding
oil is Russian oil of the I 5A inspection window (pos. 10, fig. 2). The oil level must not Causes: wheel.
brand. Refueling rate – 0.3 l. exceed the middle upper window or be below the middle of - incorrect grinding mode; 3. Tighten the spindle drive belts.
Navigate through the viewing the lower window. The machine operating time is recorded - loosening the tightening of the grinding
window. The oil level should by the operator-grinder in a special (watch) magazine, wheel;
- loosening the tension of the drive belts
be in the middle of the window. which is present on the grinding site. In the same journal, he of the spindle of the grinding headstock.
notes the occurrence of various malfunctions (malfunctions) Explicit defective grinding. Replace grinding wheel.
TWO A YEAR to completely in the operation of the machine. This journal is a technical Causes: Note. The grinding wheel is used no more
replace the coolant with cleaning reporting document. Control over the observance of the - wear of the grinding wheel; than half its diameter. At the same time,
(flushing) the coolant tank and correctness of its management is assigned to the head - increase Vokr. grinding wheel due to a the minimum wear diameter of the grinding
magnetic dirt trap (separator). (master) of the grinding site. decrease in its diameter. wheel for the BRH 20AII machine is 120
mm.

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