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DRILL BUSHINGS

• FIXED RENEWABLE, TYPE "F" - TECHNICAL INFORMATION
  FINISH GROUND O.D.

† For Flat Clamp milling (add letter M after type)

TECHNICAL DATA

This bushing has a unique design allowing easy replacement Simply remove the lock screw or clamp without removing the jig or fixture from the production line.

STANDARD SIZES:
Standard sizes in a given I.D. range are sizes listed in the decimal equivalent chart either as a fraction, number or letter size. Any other decimal or millimeter size within a given range is considered special and will be priced accordingly.

TO ORDER:
Specify Type and "Reamer Bushing". Reamer bushings will be furnished with correct tolerance on all fraction, number, letter, and all decimal sizes. (Priced as specials.)

COUNTERBORE:
Bushings with small holes are counterbored leaving correct drill bearing, to facilitate chip removal and lubrication.

NO COUNTERBORE:
Bushings normally counterbored may be ordered without counterbore by specifying "No Counterbore" or using abbreviation "N CB". (Priced as specials.)

CONCENTRICITY:
(Total indicator reading) Bushings 1/8" to 1" I.D. - Concentricity 0" to .0003" (Max.). Other sizes -Concentricity 0" to .0005" (Max.). On counterbored bushings above tolerances will be met at the drill exit end.

RADIUS:
All bushings feature a blended radius at drill entrance unless otherwise specified.

STEEL:
Our bushings are manufactured from either C1144 Stressproof steel or other high carbon steels known for their durability and stability. Special materials such as bronze, tungsten carbide, 52100 steel, 300 and 400 Series stainless steel plus A2, D2, D33 M2 and M4 tool steels are also available.

HARDNESS:
Rockwell C 62 - 64 in the hole.

APPLICATION DATA:
The fixed renewable, Type F, drill bushing is the ideal design for long production runs where the number of parts to be drilled or reamed is greater than the normal wear life of the drill bushing. This type is used in conjunction with a liner, Type L or HL bushing and is secured in place by a lockscrew or clamp. The unique design allows easy replacement. Simply remove the lock screw or clamp without removing the jig or fixture from the production line.

INSTALLATION DATA:
The fixed renewable bushing is used with a liner, Type L or HL, drill bushing. The body O.D. is ground to provide correct slip fit with the liner. See installation data for liner bushings. The fixed renewable drill bushing is held in place by a lock screw or clamp.

NOTE:
Chip clearance: Due to the abrasive action of metal particles, sufficient clearance should be provided between the drill bushing and the work piece to allow for removal of chips. Careful consideration of this point will aid in producing accurate holes. (A rule of thumb is, the greater the clearance the greater the chance of error.)
Example: The recommended chip clearance for metals producing small chips, such as cast iron, equals one-half the drill diameter. The recommended chip clearance for metals producing long chips, such as cold-rolled steel equals one to one and one-half times the drill diameter.

Maximum Accuracy: Use renewable bushings of different lengths to obtain the combined advantages of adequate chip removal and precise accuracy.
Example: Use a renewable drill bushing that is short enough to provide proper chip clearance during the drilling operation. Next, use a renewable bushing long enough to contact or closely approach the workpiece for the reaming operation.

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