What type of chuck is used for eccentric turning?
Eccentric turning on a lathe refers to the turning off the center or not on the normal center axis, it can be done on 3 jaw self-centering chuck or 4 jaw chuck in different situations, the 4 jaw chuck with independently moved jaws allows parts to be moved off-center.
When would you use a 4 jaw chuck?
You can use a 4 jaw chuck lathe to safely hold square, hexagonal, wound, and irregular-shaped workpieces, with the independent movement of the jaws enabling accurate adjustment. The pay-off is that they are more time-consuming to set up and configure.
What is the accuracy of work that can be turned by 4 jaw chuck?
Clarification: In four jaw chuck, work can be turned within 0.022 mm accuracy.As per the theory of four jaw chuck, this chuck also provides the facility of deliberately setting the work off-centre to produce eccentric workpiece.
How do you use a four jaw independent chuck?
- Start by setting all the jaws to an equal distance from the outer edge.
- Next, place your stock in the chuck and tighten the jaws against it.
- Rotate the chuck until you find the high and low swings.
- Rotate the chuck to find the highest swing.
- Divide the highest number by two and rotate the chuck back to that point.
What is eccentric rotation?
In mechanical engineering, an eccentric is a circular disk (eccentric sheave) solidly fixed to a rotating axle with its centre offset from that of the axle (hence the word “eccentric”, out of the center).
Is Four jaw chuck self centering?
The main purpose of a 4-jaw self-centering chuck is to hold square stock. It can also be useful in holding thin wall round tubing that will collapse easily. Round stock that is held in this chuck must be perfectly round and can not be at all elliptical or one of the jaws will not grip.
What is offset turning?
Offset turning is any sort of turning in which the central axis of the work is not directly in line with the headstock spindle. The type of offset turning I use to sculpt human figures on the lathe is a form of spindle turning. That is to say that the grain of the wood is generally parallel to the headstock spindle.
What is the purpose of eccentric shaft?
Eccentric shaft are usually with features of small eccentric distance, thus its can only provide small displacement. Eccentric shaft is the important element, which play the important role in ginning operation. These shafts provide an oscillatory motion or action to moving knives.
How does an eccentric work?
An eccentric (lengthening) muscle contraction occurs when a force applied to the muscle exceeds the momentary force produced by the muscle itself, resulting in the forced lengthening of the muscle-tendon system while contracting (Lindstedt et al., 2001).