Print Reading and Tolerancing in the Machine Shop

[@firearmsstudent]

So... yeah, this is Justin from QA just letting you know that you're wrong. Toodaloos.

[@davidrule1335]

Every line is there for a reason. I thought I cough something on the third view.

[@qcnck2776]

It is always a pleasure to see the basics lectures from you. Great, concise explanations. Please keep it up.

[@davidrule1335]

I'm a pipe fitter/machinist, It go's a long way when a draftsman would come out to the shop floor. Watching what we do and asking about a pipe spool he has to design. When there is a field weld, he would ask "where do you want it". This would avoid any 1G horizontal welds, as they typically take longer. However sometimes they are preferred to avoid ladder or laying on the ground welds.

[@peirob]

Interesting video, thanks for it. However, there is a drawing error. On drawing shown at @12:00, bottom-right view, the rectangular pocket length seems equal to the part width 2.0 minus 2 times the edge recess widths 0.375 (there is a perfect alignment of vertical lines) that is 2.0 - 0,75 = 1.25. On the top-left view this length is set to 1.00. This is not consistent. Note that this is the first time I notice something wrong in your videos that I find very pedagogical for someone not used to north American machining.

[@StuartdeHaro]

Well darn. Good catch!! I'll add that to the list of other drawing mistakes that have been pointed out. I'm much better in front of a machine than I am in front of AutoCAD. Thanks for watching!

[@davidrule1335]

Here is what I would do. Look on the print for N.T.S. Not to scale or a note: Some lines have been moved for blue print clarity. Also see if you can find conflicting info in another view, maybe on another print, If so go straight to the man who drew it ( not his boss) and find out what he want's. Get him to put his initials on it.

[@davidrule1335]

@@StuartdeHaro You did just fine.

[@bruce150]

Stuart, another informative useful video. Thank you! I wish I could take your classes at your college !

[@vinnybambizi3048]

Yes, but we know the engineers are the smarter ones ;-)

[@ndav8r]

Right hand defaulted or what if left hand threads?... 11:36 / 14:35 ...Justin wants to know!

[@StuartdeHaro]

Right hand is the default. If it's left-handed the thread callout will have "LH" after it. As you can imagine, that is easy to miss sometimes.

[@ndav8r]

Thanks!!!@@StuartdeHaro

[@wnebergall]

One of my not so favorite classes in college

[@charlesblanton1008]

I noticed the missing centerline dimension in the top view, and that you need to show those hidden lines in right side view...Had my eyelid twitching the whole time the drawing was on screen lol. Very good video though and great points about unnecessary tight tolerancing. 👍

[@diegochavez56duece]

I got confused there aswell I learned that in my first semester of drafting. Much more obvious Ethan the measurement inconsistency

[@toddp9541]

We got a whole army of Justin's in my machine shop🤣

[@capsoulgotthehits6719]

trying my best to learn this i just get confused ima going to replay this as many times as i can.

[@MITRotorcraft]

Great teaching aid. Maybe mention the difference between 1st & 3rd angle projection 👍

[@angelramos-2005]

Thank you for sharing

[@fragjump5407]

Any good GD&T link video here my friends?

[@toddp9541]

We had material that was similar to Delron and the dimension would change due to the thermal characteristics so over all length would be fine at the machine, but would shrink in inspection 🤣 you could use a height gage with a .0001 indicator and watch it move🤪

[@TomChame]

Excellent, very interesting, thanks.

[@andrewsgunn]

Thanks, that was really useful.

[@Jake-zc3fk]

Awesome job! Thanks

[@lohikarhu734]

Hi Stuart; can you tell us if/when you will have another video up? Liking your work and production.

[@StuartdeHaro]

I have a bunch of videos shot that I need to edit. Hopefully I'll have time over my holiday break.

[@johnstrange6799]

Another home run video. Great job.

[@chrisstephens6673]

All good info. Just a thought, should there have been a separate tolerance for the drilled and reamed hole or are you going with the x.xxx listing?

[@StuartdeHaro]

There probably should have been, yes, especially if it was meant for a press fit on a dowel pin.

[@arvinbaguion2041]

please more videos like this. need more lecture how to read blueprint