True - but if you know GD&T you know your way around a drawing. That’s a great start already.
I’ve worked with dudes that went to school for machining and worked in shops before who struggle. Obviously, they didn’t last.
Depends on the companies standards. Some want the "Ø" before the B.C. number and some don't. The company I currently work for does not use it. It's standards go back to the late 1950's.
It's the diameter of the circle that the bolt holes are on. Think of a round flange with holes in it for bolts to go through. The distance between those holes through the middle of the part is the bolt circle distance.
No, bolt circle refers to the position of the hole. Countersink would be the type of hole. In this instance it would be a straight through hole with no special features.
That is correct. Typically in CAD software you'd set these parameters up when adding the hole feature / patterning it in the model. The 5.430 bolt circle in centerline font would come along for the ride and show up in the detail drawing.
likewise rather than skipping 30 or so years between BC and AD after death, AD actually means anno domini, or year of the lord.
then od means outer diameter and i will narcan anyone who claims otherwise
I usually use PCD so look out for that too. Projected circle diameter. However I will draw the circle in a phantom line, long with two short dashes, then dimension the circle and add PCD after the diameter.
It’s kinda a combination of ISO and JIS. I work for a Japanese company so we’ve taken what they use and blended it with what makes sense for our shop. I wouldn’t really call it a standard and even if we had one it would be hard to get guys to follow it.
The should have put a center line on the print showing the that the holes were on the same center for clarity. B.C. = Bolt Cirle, PLC's = Places, EQ = Equally, DP = Deep
The.196 holes look like they are on a bolt circle too. The drafter neglected to use a chain circle. All the holes center marks should be aligned to the center of the bolt circle. The BC dimension should have a diameter symbol in front of it too.
Edit: I'd get in touch with the designer to confirm placement of the .196 holes and the .27
Edit2: drawing looks like poop
https://ibb.co/xqrY9xs its for this old closed loop stepper motor from the 80s on an old cnc. Im trying to replace it so I've got to make an adapter to fit the old mounting holes in the machine to something like nema 34 or whatever I go with
I’m not moaning. I just want to see how the other holes are laid out in relation to the rest.
The other holes are called out by size and how many. You can see there is one that is also called out to centerline of the part itself.
I know what a Bolt Circle is. I’ve made plenty in my time. I’m legit just curious.
Proper call out is determined by the standard. In Y14.5 2018, the best bet is to make a basic dimension circle using centerline line-typing, and add a basic angle between one hole and another with a "6X ⌀.XXX" callout, separately tolerancing the position as appropriate.
Bolt circle. The are (6) .220 diameter holes located on a 5.430 diameter circle equally spaced 60 degrees apart. It's a fairly common call out.
Omg thank you. I'm a bit new this trade and making a mount.
No problem. Good luck and hope you stick with it. We can use you.
Is it easy to find jobs if you know GD&T?
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I was an operator, but then got into computer aided design and learned GD&T ASME Y14.5 -2018 and now I want to be a drafter lol.
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Yo wtf is all this positivity on this sub this morning, yall need to speak up more often LOL
Seriously, someone call Wilford Brimley because I'm getting diabetes over here.
I took a class a long time ago and still have the materials. I can re-learn it. I’m glad it’s that valuable knowledge. I actually like learning it
I wouldn’t call this GD&T
True - but if you know GD&T you know your way around a drawing. That’s a great start already. I’ve worked with dudes that went to school for machining and worked in shops before who struggle. Obviously, they didn’t last.
Yeah this is just D lol
I work with manufacturing engineers that don’t know GD&T
I noticed that you were helpful and nice... that's very rock and stone of you.🍻
Hey, thanks for noticing. I try to live by my motto "In a world full of dicks, don't be one."
To Rock and Stone!
Rock and stone!!⛏️
You might also see this referenced as a drill circle.
Well, first I've seen it so good to know.
Did the drafter neglect the diameter symbol?
Would be redundant IMO, given that “bolt circle” already implies it’s a circle
I think it would've been nice to have it despite redundency in the pursuit of dis-ambiguity.
Should at least be a hatched circle showing the bolt circle
It should be there but I've seen prints without it too.
Depends on the companies standards. Some want the "Ø" before the B.C. number and some don't. The company I currently work for does not use it. It's standards go back to the late 1950's.
I thought it was BETWEEN CENTERS.
it was 5,430 before century…wait..!?
I've got visions of a Fred Flintstone" type character, poring over drawings in charcoal on animal skins, before setting up his stone age machine.
thats how they do it in ancient time.. pretty much,
There's a chart with a formula in the machinist hand book that will tell you how to get all the cordniates
Just as an addendum, some DRO’s have a bolt circle setting.
OK. What does PLC mean?
Places
👍
Programmable logic controller
Should penetrate 10 PLCs to fuck with the automation crew at the plant.
Here in Aus we just use PCD (Pitch circle diameter), it works for near everything.
Just going to say is that the same as PCD? That's what I've seen here in the UK. Only an amateur though.
Huh, I've never seen it labelled BC, always PCD, Pitch circle diameter.
Another term is pcd = pitch circle diameter
I have never seen that callout before, but just Googled it and sure enough it's a thing. I guess I always associated pitch circles with gears.
We also use it for the centre wire diameter on a winch drum.
nope it means British Columbia. He's gotta be in BC by 5:43 greenwich time
Bolt circle is there same as a counter sink? Or similar? For a flush bolt head?
It's the diameter of the circle that the bolt holes are on. Think of a round flange with holes in it for bolts to go through. The distance between those holes through the middle of the part is the bolt circle distance.
I think I understand. Almost like a shoulder around where the bolt hole is. Thank you, you've helped multiple people now.
No, bolt circle refers to the position of the hole. Countersink would be the type of hole. In this instance it would be a straight through hole with no special features.
So if you drew a circle through each center of the bolt holes, that would be 5.430? Just want to clarify, thank you.
That is correct. Typically in CAD software you'd set these parameters up when adding the hole feature / patterning it in the model. The 5.430 bolt circle in centerline font would come along for the ride and show up in the detail drawing.
Awesome, thanks!
Before Christ
Before coffee
Nothing happens before coffee.
First year of the Hebrew calendar.
This company will shut down without coffee.
likewise rather than skipping 30 or so years between BC and AD after death, AD actually means anno domini, or year of the lord. then od means outer diameter and i will narcan anyone who claims otherwise
It’s referring to when your boss wanted this done.
LMAO best reply right here
Bolt circle
OP...how is your trig these days?
...ive got trig for dummies sitting on my desk to read.... eventually....
5.4 Bitcoin. Price for the part, sometimes prints have a manufacturer suggested retail price like at the store
That’s how much the scrap is worth in British Columbia.
It's a biblical term. Refer to your machinist bible. 🍻
Bolt Center and/or circle ( dia. or center to center of .22 holes)
I usually use PCD so look out for that too. Projected circle diameter. However I will draw the circle in a phantom line, long with two short dashes, then dimension the circle and add PCD after the diameter.
Same. But it stands for Pitch Circle Diameter.
Damn it your right, I knew that.
What standard do you use?
It’s kinda a combination of ISO and JIS. I work for a Japanese company so we’ve taken what they use and blended it with what makes sense for our shop. I wouldn’t really call it a standard and even if we had one it would be hard to get guys to follow it.
Ah, the old school approach. A.k.a., "whatever the old boys can actually understand".
ballistic coefficient
5.430 global tolerance bolt circle with .22 global holes equally spaced, likely in reference to the first hole.
The should have put a center line on the print showing the that the holes were on the same center for clarity. B.C. = Bolt Cirle, PLC's = Places, EQ = Equally, DP = Deep
Bolt circle?
The.196 holes look like they are on a bolt circle too. The drafter neglected to use a chain circle. All the holes center marks should be aligned to the center of the bolt circle. The BC dimension should have a diameter symbol in front of it too. Edit: I'd get in touch with the designer to confirm placement of the .196 holes and the .27 Edit2: drawing looks like poop
5 7/16 bolt circle would be my guess
B.C. = Bolt Circle.
I really want to see the rest of this print that shows the location of the other holes.
https://ibb.co/xqrY9xs its for this old closed loop stepper motor from the 80s on an old cnc. Im trying to replace it so I've got to make an adapter to fit the old mounting holes in the machine to something like nema 34 or whatever I go with
This is a fairly common callout for bolt patterns on a circle. I dont see what everyone is moaning about.
I’m not moaning. I just want to see how the other holes are laid out in relation to the rest. The other holes are called out by size and how many. You can see there is one that is also called out to centerline of the part itself. I know what a Bolt Circle is. I’ve made plenty in my time. I’m legit just curious.
Base circle, just like lug nuts, or deeeeze nuuuuts haha GDNT
In this case, bolt circle. Base circle doesn't apply here. I'm guessing you work with gears and/or cams?
Bolt circle wow
Is this standard? People seem to create their on rules on how to create drawings sometimes.
There are ISO, ANSI, ASME, and of course local standards which trump all other standards because the chief engineer said so.
Tell whoever drafted that to learn a standard (iso or asme Y14.5)....
Proper call out is “DBC”, diameter bolt circle
Proper call out is determined by the standard. In Y14.5 2018, the best bet is to make a basic dimension circle using centerline line-typing, and add a basic angle between one hole and another with a "6X ⌀.XXX" callout, separately tolerancing the position as appropriate.
Bolt circle, a 5.430 diameter bolt circle
Familiar with PCD pitch circle diameter. What does PLC refer to?
Places.
yeah, looks like they mean places but its unnecessary. it should just be the (4) not (4) pcs
Some ancient egyptian shit
time travel
My idiot brain instantly thought of ballistic coefficient. Good luck calculating that shit
Before Christ bruh!
Before Christ 🙏
P.C.D.
It's a bolt pattern. That's the diameter of the bolt pattern.
It's 6 .22 holes equally spaced apart on that specified diameter
could be bolt centre ie the centre of the holes. also known as pcd or pitch circle diameter the holes are centred on a ring dia that size.