Does anybody know how the recommended holes sizes for screws were established in the ASME B18.3-1986 & B18.2.8 tables? For example, the following recommendations are given for a 1/4-20 screw.
ASME B18.3 - Close Fit .266" (17/64 drill)
ASME B18.3 - Normal Fit .281" (9/32 drill)
ASME B18.2.8...
Thanks for the replies.
ewh that is what I thought of doing, but wasn't sure how. Do you have example that you could share?
I reviewed a video I saw earlier in week. If you watch at this specific point https://youtu.be/f4A2BGX9HLw?t=299 the narrator explains that by placing a datum symbol on...
I have two 4 hole circular bolt patterns, the holes are on same angles 90 deg apart. I set first pattern relative to part A(face), B(bore) and C. I want the second bolt pattern position so that the angle is aligned to that of the first pattern. I suppose I could pick one of the holes, make datum...
I have a 4 hole bolt pattern, 90 deg apart. I know how to set position these holes realative to datums A, B and C. The problem I am not sure about is how to set position on bolt releiefs (in side wall) that need to be concentric to these holes on opposite side of part. Do i need to create datum...
Compositepro,
The ANSI/ASME B1.20.1 indicates that NPT threads are tapered .75 in/ft in 3.1.5. ANSI/ASME B1.20.1 specifies that the L-1 gauge should stay within +/-1 turn. Since the threaded hole is tapered, +3-1/2 turn would mean the hole is oversized, a positive value indicates the gauge went...
Hello,
I am little confused by a note in the UL674 "Electric Motors and Generators for use in Division 1 Hazardous Locations" standard. It is under the section "Connections for conduit". The specific section is detailing the requirements for a threaded conduit entry into an electric motor...
Hello,
I was wondering if anyone has come across a tool that would help you distinguish mechanical fits(ref. http://www.me.rochester.edu/courses/ME104Q.dque/PDF/Fits.pdf). I am thinking is it would be as simple as a 1" diameter x 2" tall dowel pin with a 2" thick rectangular plate that had...
electricpete,
Right, the "S"=FLAT is the case I am referring to. In those cases, for a 3/8 or 1/2 shaft diameter, what is the "R" dimension called?
Thanks,
-ren
Guys,
Thanks for the replies. In this particular case I am asking about a dimension to a flat on a 3/8 shaft diameter. I should not have appended the picture with a keyway, it made the question a little bit confusing(see how it notes "FLAT" for dimension "S" on the drawing, that is the case to...
Hello,
What is the correct terminology for the distance from the outer diameter of a shaft to the flat? Dimension "R" on the attached sheet. I believe it is flat height, but I am not sure.
Thanks,
-ren
Hello,
I have a question about keyway tolerances as specified by ANSI B17.1-1967 (R1998). For a 1/8" square key, for a class 1 fit, the width and height need to be .125 +.000/-.002. The key seat dimensions need to be .125+.002/-.000. That would give you a line fit in the worst case, but this...
Hello,
I have used this setup ever since I started working back in Autocad 2003. Basically, you setup your right mouse button to bring up the object snap menu. It is awesome and I am suprised these cad packages do not set this up as the default. So, now I am working with Draftsight, but I am...
John,
Thanks for the response. Yes, that makes sense. You would want a tightly tolerance surface to ensure consistent torque values.
I still wonder why the height offset .015" to .025" is needed for this surface, why not tightly tolerance the head?
Thanks,
-ren
Hello,
I have been investigating the differences between a hex bolt and hex cap screw. The hex cap screw has a round bearing surface underneath the head. The height of this bearing surface is .015" to .025" from the bottom of the head. The circular runout this surface needs to be within a...
Hello,
I am using 2007. Is there a way to grab a color from an image in Solidworks? I have a picture(.jpg) of a leadwire. I want to apply the color from the leadwire picture to the model.
Thanks,
-ren
Thanks for the replies! I gave the Alt code another try, this time with the number keypad, it worked!
I am surprised that SW doesn't include a button allowing you to add symbols in this feature, perhaps it will be available in a future release.
-ren
