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- Jun 7, 2013
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A note regarding the use of harder stronger materials for such things as boring bars; it makes no difference in ridgidity using alloy steels, hardened or not, all steels have very nearly the same modulus of elasticity; a full hardened alloy steel is no stiffer than soft mild steel. The only way to increase stiffness to the diameter (in this case). As an example, increasing a boring bar or arbor from 1" to 1-1/4" diameter increases its stiffness by a factor of 5.
The job shown is clearly not a job for a boring bar of the type shown. One writer suggested pinning the threads to prevent the head from threading off; this would be next to impossible, as the boring heads are quite hard, besides which, I would suspect that the threaded part would be inaccessable for drilling.
The job shown is clearly not a job for a boring bar of the type shown. One writer suggested pinning the threads to prevent the head from threading off; this would be next to impossible, as the boring heads are quite hard, besides which, I would suspect that the threaded part would be inaccessable for drilling.