Question 38 (Textile Engineering & Fibre Science)
A bobbin lead roving frame is running at 25 m/min delivery speed and 1250 rpm spindle speed. The rotational speed of the bobbin, at the instant of 0.10 m bobbin diameter, accurate to two decimal places, is __1327 to 1331__ rpm.
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Given-
Delivery speed(FRD)=25 m/min
Spindle speed=1250 rpm
The rotational speed of bobbin at 0.10 m bobbin diameter=?
Dia of bobbin(D)=0.10 meter
Formula::
In bobbin lead roving frame-
Bobbin rotational speed-flyer or spindle rotational speed=FRD/
D
Bobbin rotational speed-1250=25/(3.14*0.10)
Bobbin rotational speed-1250=79.62
Bobbin rotational speed=79.62+1250
Bobbin rotational speed=1329.62 rpm (Answer)