Answer Posted / shriram.....

Function of lead screw & ball screw are same like nut & bolt
Lead screw means it one threaded screw.

Lead screw used for conventional machines like lath,
sapping, drilling machines
Lead screw gives 20-micron accuracy & it has wear & tear is
more as compare to ball screw.

Ball screw used where high accuracy & performance required
like in CNC machining center. In ball screw balls are used
for smooth operation in this case
Wear & tear is less as compare to lead screw.

Dear Brother can u tell the proper size selection of cable & the fault level calculation of braker, busbar etc. pls mail me at azeemk30@gmail.com

1873

---

What is the formula to calculate the rating of power cable for three phase current.

2065

---

could you measure current in parallel?

1043

---

What are the advantages and disadvantages of the dc motors?

1071

---

Brief me about maintenance planning & sheduling of machine tool.

2085

---

What is gross error?

1089

---

howmany electrician should maintain for a 1000 kva used plant... in kerala..

2055

---

state basic meaning of 'INDUSTIAL AUTOMATION'?

1854

---

What are the uses of lead compensator?

1107

---

how to check regenerative load in drived motor

2163

---

What is the comparison between 30mA DP RCCB and 100mA DP RCCB and can replace it against 63A MCB

1534

---

why in a swquence network representation, the negetive sequence generated voltage is taken as zero?

1952

---

When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

1924

---

In PFI plant one stage capacitor connection is directly connected(with out megnetic contact controll). but why?

2217

---

Why space heater is required for each verical bus bar chamber? if one space heater is adequate or not for anti condensation?

2476

---