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Machining cycle time 
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#1
Dec1107, 12:42 AM

P: 6

Please help me to calculate theoratical machining cycle time for the below mentioned operations:
1. Hobbing 2. Shaping 3. Shaving I need variious calculations involed in determining the theoratical cycle time. Please refer any website, if it can help me. Thanks, Rishi 


#2
Dec1107, 01:32 AM

P: 733

dude you can find the required formulas in the text, or they can also be derived. they are pretty easy, i dunno where my stupid handbook is:((



#3
Dec1107, 05:43 AM

Sci Advisor
P: 5,095

Cycle times are going to be highly dependent on each particular part being machined at that time. What depth of cut? What length of cut? How many total operations?
I would recommend that you go to your school's library and start looking for manufacturing engineering books. Sometimes you have to crack a book open. Websites don't do it all. 


#4
Dec1107, 07:56 AM

P: 1,127

Machining cycle time



#5
Dec1407, 03:39 AM

P: 6

thanks for your replies,
i knew that these terms require various input parameters to calculate the time. But can't we still freeze all those parameters like depth of cut etc. to make a general empirical formulae, in which putting all inputs will give a relevant theoratical time. I've starting googling in manufacturing handbooks for different formulaes and cutting forces required to calculate time. Please help me in with the referance of some books, if someone have some good literature in soft stage. Regards, RiShI 


#6
Dec1407, 06:36 AM

P: 1,127

Your question suggests you're new to machining, yet asks for "rules of thumb" that a senior manufacturing engineer might use. Is this just an exercise for a class or are you trying to do takeoffs from prints?



#7
Dec1407, 11:16 AM

P: 733

arent they just the emperical formulas in text anyways??
you put in all the inputs and get the machining time 


#8
Dec1407, 12:09 PM

P: 1,127

Low volume stuff is usually done by a skilled estimator or machinist who uses the time of a previously machined similar piece as the basis for the estimate. If you are in school (and I swear to the heavens that some schools now teach engineering without ever putting students into a shop), you may learn theoretical estimates. If you are in that boat, I suggest you get the ASM books for the metals you are interested in. 


#9
Dec1507, 10:12 AM

P: 733




#10
Dec1607, 10:30 PM

P: 6

well...to start with....i've some literature on simple turning as well as milling...
but i precisely mentioned to calculate times for hobbing, shaping and shaving operations. 


#11
Nov2710, 03:47 AM

P: 5

Cycle times are going to be highly dependent on each particular part being machined at that time. What depth of cut? What length of cut? How many total operations?
I would recommend that you go to your school's library and start looking for manufacturing engineering books. Sometimes you have to crack a book open. Websites don't do it all. 


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