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RECOMMENDED METHOD FOR HOLDING DRILLS IN SPINDLES

Important
Use only the spanners provided for the head. Do not overtighten the collet. The locking insert must be used to provide a positive drive for the drill.
The ring spanner should be used for tightening the collet. The open ended spanner is for holding the collet spindle to prevent it from turning. Do not hold on any other spindle that the one in which the collet is being tightened other undue strain may be transferred to the gearing.
All straight shank drills have a tendancy to slip when held in a collet or chuck. It is therefore important that the locking insert is always used for holding all sizes of drills. With the exception of the drills too large to enter the locking insert, it is only necessary to grind a single flat on the shank end of the drill. The length of the flat should be approximately equal to the diameter of the locking insert. The depth of the flat should be 1/3 of the drill diameter.
A flat of these proportions will not interfere with holding the drill in a normal chuck but when used in a GY-ROLL spindle provides a positive drive comparable with the tang drive on the taper shank drill. The locking insert is only really effective if there is a flat on the end of the drill
Drills too large to enter the locking insert should have an appoximate square ground onto the end of the shank. The shape of the square is not critical provided that it freely enters into the locking insert.
When the drill is first put into the collet it is important that it is held with a grip light enough to locate the drill yet still allowing it to move rationally and axially in the collet. The screw in the locking insert should be adjusted so that the locking insert is in the centre of the spindle when gripping the drill. Check the end float of the locking insert by ensuring that it moves freely.
When instering the drill into the locking insert be sure that one of the screws locates squarely on the ground flat of the drill, and that the drill is pushed into the locking insert as far as it will go. The collet should now be firmly closed after which the screws in the locking insert are finally tightened. If the locking insert screws are lost they should be replaced with similar screws. It is important that the dog end or gripping end of the screw is flat
When spindles are working on close centres check that the locking insert screws clear the screws in adjacent spindles.
In cases where the spindles are too close togetherto use the ring spanner for tightening the collet, the open ended spanner has to be used. In such cases the collet should be progressively tightened by applying the spanner to alternative collet flats. If a spare short handled open spanner is not available a long spanner may be used for holding the spindle. The short handled spanner can then be used for tightening the collet.

LUBRICATION

GY-ROLL Heads are lubricated with Oil as specified on the nameplate It is important to ensure that grease is never used as this will clog up the lubricating system.
GY-ROLL Heads are lubricated with Oil as specified on the nameplate It is important to ensure that grease is never used as this will clog up the lubricating system.
The oil in a Y-ROLL head is carries in a polyurethane felted foam block. It is fed by a capillary action to the gears and bearing extremities. The oil absored in the polyurethane block us adequate for lubricating the entire heads. There should be no free oil floating around in the head. Any indication of oil dripping from the spindles or any other part of the head means there is an excess of oil in the head.
The oil in a Y-ROLL head is carries in a polyurethane felted foam block. It is fed by a capillary action to the gears and bearing extremities. The oil absored in the polyurethane block us adequate for lubricating the entire heads. There should be no free oil floating around in the head. Any indication of oil dripping from the spindles or any other part of the head means there is an excess of oil in the head.
Oil is pumped into the head by means of the nipple in the side of the body. 2 - 3 strokes of an oil gun should provide sufficient lubrication for appoximately 500 running hours. If there is an excess of oil in the head it can be drained off by running the hear with the lubricating nipple or oil plug removed.

  • It is important to appreciate that the GY-ROLL lubricating system is not based on an oil bath as with this system the oil would settle in a different part of the head according to how the head was mounted. This could adversely effect lubrication to bearings at the extremities of the head while other bearings may be flooded causing unnecessary agitation of the oil and overheating of spindles if there were run at high speeds.
    As it is most important to ensure that grease is never used, if there is any risk of someone pumping grease into the head it is safer to replace the lubricating nipple with an oil plug. The nipple can then be put back at the appropriate time interval when the head is due for a further injection of oil.

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