A rectangular face of a casting 250mmx100mm is to be machined on a sharper.if the average cutting speed is to be 20m/mins and the feed is to be 2mm/stroke,calculate the time taken to machine the face of the casting.Allow 5mm overrun at each end of the stroke
I guess I will assume the tool is cutting the long way (250 mm) and moving sideways 2 mm each stroke
Assuming that, and you can always turn it around and do it the other way, each stroke will be 250 + 5 + 5 = 260 mm long and 2 mm wide. To get 100 mm then we will have to take 50 strokes
so we cut a total of 50 *260 = 13,000 mm
at 20 m/min which is 20,000 mm/min
so it is 13,000 mm /20,000 mm/min
or .65 minutes
i don,t have much word to say bt tank you verymuch
To calculate the time taken to machine the face of the casting, we need to consider the total distance that needs to be machined and the speed at which it will be machined.
Let's break down the steps to find the machining time:
1. Calculate the distance to be machined:
The distance to be machined is equal to the length of the casting face minus the overrun at each end of the stroke. Since there is a 5 mm overrun at each end, subtract twice the overrun from the length of the face.
Distance to be machined = 250 mm - 2 * 5 mm = 240 mm
2. Calculate the total number of strokes:
Since the feed is given in millimeters per stroke, we need to divide the distance to be machined by the feed per stroke.
Total number of strokes = Distance to be machined / Feed per stroke
Total number of strokes = 240 mm / 2 mm = 120 strokes
3. Calculate the time taken to machine one stroke:
To calculate the time taken to machine one stroke, we can use the cutting speed given.
Time taken for one stroke = Stroke length / Cutting speed
Time taken for one stroke = 100 mm / (20 m/min * (1000 mm/m)) = 0.005 min (since 1 min = 60,000 ms)
4. Calculate the total machining time:
The total machining time is the time taken for one stroke multiplied by the total number of strokes.
Total machining time = Time taken for one stroke * Total number of strokes
Total machining time = 0.005 min * 120 strokes = 0.6 min
Therefore, the time taken to machine the face of the casting would be 0.6 minutes.