Thank you so much, Michael. We aim to provide useful, applicable mechanical design information. If you haven't done so already, please visit www.MechanicalEngineeringAcademy.com for further similar material. -Take care ... till next time!
Good video. However, the format you have for calling out the quantity (underneath and at the end) is incorrect. ASME standards only mentions calling out the quantity of holes etc. at the beginning of the callout per ASME Y14.6 2001 and ASME Y14.5M 2009. I also don't think its necessary to spec the pilot drill hole size on a threaded hole. Probably, a lot of people will disagree. I believe the machinist should know the standard drill size for each thread size. So, this is redundant information.
Hi Septian, it depends on the details of how the custom thread is different. Is it simply a non-standard pitch, but the profile is standard? Is the pitch AND the profile different? Etc. I recommend that you consult the Machinery's Handbook. It's an excellent resource with extensive information on threads (and many other topics). If you would like (and are able) to share more details on your application, we would be happy to help further. -Kind regards
A good fabricator will absolutely see 3 decimals and interpret that according to the 3 decimal call out for tolerance listed on the title block. He is just plain wrong on that point. And if your an engineer you will pay attention to this fact because the quotes you get back from fabricators will reflect this demand in tolerance. Wondering why everyone is so expensive? They are not going to explain this to you. They are going to assume you want the extra precision for a reason and charge you accordingly. If you don't need that precision then make sure the blue prints reflect that. It is not the fabricator's job to question the design. At most he will clarify conflicting or unclear information. Like he said though, if you just print the size of the bolt - or what have you - you will completely negate this problem in communication. List the #6 screw and you will get that properly. List .138 and the fabricator will try to machine the part according to the tolerance information available. And if he cannot find that information he will call you for clarification. Save yourself the hassle. Use the standards wherever possible. Any fabricator will know what size to make the holes if you use the standards. And if you publish something different he will assume you had a reason for doing so. And if he can make sense out of it you will never hear about it. But the bill may be larger than expected.
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Fantastic tutorial!
Very informative and refreshing
Great video!
Thank you so much, Michael. We aim to provide useful, applicable mechanical design information. If you haven't done so already, please visit www.MechanicalEngineeringAcademy.com for further similar material. -Take care ... till next time!
nice video sir
Hi sir, You mentioned that the UNC threads have a smaller pitch ,and the UNF threads have higher pitch. Please could you explain in detail ?
Good video. However, the format you have for calling out the quantity (underneath and at the end) is incorrect. ASME standards only mentions calling out the quantity of holes etc. at the beginning of the callout per ASME Y14.6 2001 and ASME Y14.5M 2009. I also don't think its necessary to spec the pilot drill hole size on a threaded hole. Probably, a lot of people will disagree. I believe the machinist should know the standard drill size for each thread size. So, this is redundant information.
Nice sir
how many thread and what thread size is of U1 1/8 X 31?
Hei man... thanks for the info.. but how do I specify a threads, if the threads is custom.. not standard...
Hi Septian, it depends on the details of how the custom thread is different. Is it simply a non-standard pitch, but the profile is standard? Is the pitch AND the profile different? Etc. I recommend that you consult the Machinery's Handbook. It's an excellent resource with extensive information on threads (and many other topics). If you would like (and are able) to share more details on your application, we would be happy to help further. -Kind regards
A good fabricator will absolutely see 3 decimals and interpret that according to the 3 decimal call out for tolerance listed on the title block. He is just plain wrong on that point.
And if your an engineer you will pay attention to this fact because the quotes you get back from fabricators will reflect this demand in tolerance. Wondering why everyone is so expensive? They are not going to explain this to you. They are going to assume you want the extra precision for a reason and charge you accordingly.
If you don't need that precision then make sure the blue prints reflect that. It is not the fabricator's job to question the design. At most he will clarify conflicting or unclear information.
Like he said though, if you just print the size of the bolt - or what have you - you will completely negate this problem in communication. List the #6 screw and you will get that properly. List .138 and the fabricator will try to machine the part according to the tolerance information available. And if he cannot find that information he will call you for clarification. Save yourself the hassle. Use the standards wherever possible.
Any fabricator will know what size to make the holes if you use the standards. And if you publish something different he will assume you had a reason for doing so. And if he can make sense out of it you will never hear about it. But the bill may be larger than expected.