within elastic limits..swadharma

yuktahara-viharasya

yukta-cestasya karmasu

yukta-svapnavabodhasya

yogo bhavati duhkha-ha

by practicing the yoga system. He becomes  regulated in his habits of eating, sleeping, recreation and work can mitigate all material pains

'sreyan sva-dharmo vigunah 
para-dharmat svanusthitat 
sva-dharme nidhanam sreyah 
para-dharmo bhayavahah' 

It is far better to discharge one's prescribed duties, even though they may be faultily, than another's duties. Destruction in the course of performing one's own duty is better than engaging in another's duties, for to follow another's path is dangerous.

A novice, a trainee, is not skilled, he falters, fears, hesitates, he is tense , unstable, 

but as the training/ learning matures, he becomes more confident, more sure, a nearer example of manifestation of this ''skill in action'' can be seen in various fields, professionals like, dancers, singers, athletes, sportsmen, executives, poets, speakers, soldiers, mountaineers, also circus experts etc doing fantastic tasks with ease, expertise, without stress, but with a relish in the adventures, physical or mental/ intellectual, exhibiting spontaneous flawlessness just so easily, with no stress 

Speed, feed, depth of cut must be selected properly in accordance with the nature of job, capacity of the machine, -------swadharma

also better to read the maintenance manual-------scripture

be in contact with the maker/ manufacturer--------god

or at least with his local agent/ service center/ technicians/ get trained how to operate, ------guru

clean the machine, remove scrap, lubricate well, regularly, and as per preventive maintenance schedule-------meditation ,pranayam, bath , clean clothes, clean surroundings

this is how a nice product can be generated, without defects, and without harm to the machine