Specialists in the design and manufacture of multi-spindle 
drilling and tapping heads
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Twin Spindle Adjustable Heads
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Multi Spindle Adjustable Heads
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Fixed Centre Heads
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Fitting Drills &
Lubrication
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Designed and hosted
by Drakken

 

Gy-Roll adjustable centre heads are suitable for drilling or tapping 2 holes or 3 holes equi-spaced in a straight line and 3 or 4 holes equi-spaced on a common PCD. A 5 spindle adjustable head is also available where the central spindle is fixed and the 4 outer spindles are adjustable on a common PCD.

Although the Gy-Roll 3 spindle adjustable head is primarily designed to suit equi-spaced holes on a common PCD, it is also suitable for various other 3 hole patterns. Therefore please supply a suitable dimensional drawing to enable us to establish compatibility with the hole pattern in question.


click photo to see more detail

 

Twin Spindle Extra Reach Adjustable Heads
 

TYPE DRILL TAP CENTRES (IN) CENTRES (MM)
  IN MM UNC MM MIN MAX MIN MAX
400 5/32 4 4 3 .75 2.500 19.0 63.5
650 1/4 6.5 10 5 1.000 3.000 25.4 76.0
800 5/16 8 1/4 6 .625 3.125 16.0 79.0
950 3/8 9.5 5/16 8 .750 3.750 19.0 95.0
1250 1/2 13 3/8 10 1.00 5.00 25.0 127.0
 
Three Spindle In Line Adjustable Heads
   
TYPE DRILL TAP CENTRES (IN) CENTRES (MM)
  IN MM UNC MM MIN MAX MIN MAX
400 1/8 3.2 4 3 .375 1.250 9.5 31.7
650 3/16 5 8 5 .500 1.500 12.7 38.1
800 1/4 6.5 12 5 .625 1.875 16.0 47.6
950 9/32 7 1/4 7 .750 2.250 19.0 57.1
1250 3/8 9.5 5/16 9 1.000 3.000 25.0 76.2
 
   
Three Spindle Adjustable Heads* 		 
TYPE DRILL TAP P.C.D. (IN) P.C.D. (MM)
  IN MM UNC MM MIN MAX MIN MAX
400 1/8 3.2 4 3 .565 2.320 14.4 58.9
650 3/16 5 8 5 .735 2.730 18.6 69.3
800 1/4 6.5 12 5 .915 3.415 23.3 86.7
950 9/32 7 1/4 7 1.100 4.100 27.9 104.1
1250 3/8 9.5 5/16 9 1.445 5.485 36.7 139.2
Four Spindle Adjustable Heads*  
TYPE DRILL TAP P.C.D. (IN) P.C.D. (MM)
  IN MM UNC MM MIN MAX MIN MAX
400 1/8 3.2 3 2.5 .890 2.645 22.7 67.2
650 3/16 5 8 4.5 1.125 3.120 28.5 79.2
800 1/4 6.5 8 5 1.405 3.900 35.7 99.1
950 9/32 7 12 7 1.680 4.680 42.7 118.9
1250 3/8 9.5 1/4 7 2.225 6.260 56.5 159.0
Five Spindle Adjustable Heads*  
TYPE DRILL TAP P.C.D. (IN) P.C.D. (MM)
  IN MM UNC MM MIN MAX MIN MAX
400 1/8 3.2 3 2.5 .890 2.645 22.7 67.2
650 3/16 5 6 4 1.125 3.120 28.5 79.2
800 1/4 6.5 8 5 1.405 3.900 35.7 99.1
950 9/32 7 12 5 1.680 4.680 42.7 118.9
1250 3/8 9.5 12 7 2.225 6.260 56.5 159.0

* NOTE THESE HEADS CAN ONLY BE USED WHEN HOLES ARE EQUI SPACED AND ON A COMMON P.C.D

TAPPING SIZES SHOWN ARE FOR LEAD SCREW TAPPING APPLICATIONS