The length of the bushing is measured from the underside of the head to the exit end of the bushing. Figure 10-3. Recommended hole sizes for press-fit bushings in unhardened steel or cast iron jig plates.
How long should a bushing be wrt to diameter?
Fixed renewable bushings require a diametral clearance of 0.0001" to 0.0006" to ensure accuracy and ease of replacement. In terms of OD, bushings should be twice the diameter of a typical twist drill. A bushing should be long enough to hold the drill's entire shank steady.1 Feb 1995
What are the three general classifications of drill jig bushings?
- Type # 1. Fixed Bushes or Press-Fit Bushes:
- Type # 2. Liner Bushes:
- Type # 3. Renewable Bushes:
- Type # 4. Slip in Type Bush:
- Type # 5. Screw or Clamp Bushes [Fig. 28.59]:
- Type # 6. Special Bush:
What is the purpose of a drill bushing?
1. Bushings are used to guide the drills, reamers, and other cutting tools into proper position of the workpiece.
How do I choose a drill bushing?
Things to consider in selecting the PROPER drill bushing Size Hole size, O.D. size, and length. Special Requirements Threaded O.D., angles, flats on head, other special dimensions. Standard or Special Standard sizes are less expensive.31 Mar 2020
What is the general rule to decide the length of a drill bush?
The concentricity of the drill bushes is 0.01. 8. The length of bushing should be approx. twice the diameter of the bush hole.
What is a press fit Drill Bushing?
Press-Fit Bushings Drill Bushings. Carr Lane press-fit bushings are permanently pressed into the jig plate and are generally used in single operation drilling or reaming. press-fit drill bushings come in 3 variations including press-fit, head press-fit and serrated press-fit bushings.
What is the general rule for the distance between the bottom of a drill bushing and the workpiece?
1 to 1.5 times
What is the recommended clearance range between the underside of a bushing and the top of the workpiece when reaming?
The chip clearance between the bushing and the workpiece should be ½ to 1 ½ times the tool diameter for drilling, and ¼ to ½ times the tool diameter for reaming.