2. CNC spindle power and ROI
CNC: Poor Return on Investment from poor spindle power usage
Is your CNC lathe a white elephant ?
An adult elephant costs Rs.3000 a day for its food and medical expenses – same as what a medium size CNC lathe costs for space, power, tooling, manpower and the occasional medicine
Fact: Most people use their CNC machines like white elephants. Why ? Because their programmers are obsessed about the part program, not the productivity. Because programmers think if the part is dimensionally OK, their job is done!
Spindle power usage in most CNC shops never exceeds 50 %. If you are only using 50 % of the power, your machining time is 200 % higher than what it can be. The machine spindle is like an elephant’s trunk – the part that the elephant does all its work with. If you under-utilize the machine spindle, you have a white-elephant situation !
The spindle motor on the machine is equivalent to the trunk of the elephant. Use it to the fullest extent !
Act now ! Next time you are on your shop floor, check the power meters on your CNC machines and ensure that you are using the spindle motor to its capacity in roughing operations. You can use the spindle’s continuous and half hour/10 min/15 min ratings, the power-torque curve, and the duty cycle on the part to reduce the cycle time dramatically.
By the way, CADEM CAPSturn CNC lathe programming software shows you the spindle power usage for each operation, enables you to fine tune cutting parameters so you use the full capacity of the spindle motor without overloading it. It actually considers the spindle’s power ratings, power-torque curve, and duty cycle to do this. It is an affordable CAM software that enables you to do CNC machining cost calculation and reduction.
I think the trams are a lovely way to get around Kolkata. They are comfortable, non-polluting, energy-efficient, amazingly cheap, and add character to the city. They’re also surprisingly fast – average speed 25 kmph., max. speed 50 kmph. The average road speed in Bangalore city, by the way, is 15 kmph during peak hours.
They’ve been running since 1902. Work on 550 V DC power (what kind of a voltage is that?)
The last picture is of Vidaya Balan promoting the movie ‘Dirty Picture’ on a tram.
A lot of cities like Hong Kong, Melbourne and Vienna have flourishing, widely used tram systems but in Kolkata, sadly, there’s talk of phasing them out. http://en.wikipedia.org/wiki/Tram http://en.wikipedia.org/wiki/Calcutta_Tramways_Company