A three-start external square thread of 12 mm pitch and outside diameter of 65 mm is to be cut on a centre lathe which has a 7 mm pitch lead screw. Depth of thread to give 0.14 clearance is _______ mm.

1. 6.14

Q. For cutting double start screw threads of pitch $1.0mm$ on a lathe, the thread cutting tool should have a feed rate of

Q. Metric thread of 0.8 mm pitch is to be cut on a lathe. Pitch of the lead screw is 1.5 mm. If the spindle rotates at 1500 rpm, the speed of rotation of the lead screw (rpm) will be

Q. Determine the tranfomation ratio (TR) of the gear train connecting the the spindle and the lead screw of $4TPI$ required to cut $1.0mm$ pitch screw threads in a centre lathe.

Q. A non standard thread of pitch $3.175mm$ is to be cut on a lathe having lead screw of pitch $6mm$. A change gear set provdied with the lathe has one gear each with the following number of teeth: $20,30,40,50,60,70,80,90,100,110,120,127.$ The correct pairs of change gears $(a/b\times c/d)$ for machining the given thread are (assuming that transmission ratio of the rest of the kinematic train between the late spindle and lead screw is equal to 1)

Q. For measuring the effective diameter of a metric external screw thread of 2.0 mm pitch, a 30.500 mm diameter cylindrical standard and 1.155 mm diameter wires were used. The micrometer readings over the standard and wires were 13.3768 and 12.2428 mm, respectively. If the pitch error in the bolt threads was 0.05 mm, what was the virtual effective diameter of the bolt ?