McMaster Carr item modification

[Fueler]

This is in relation to my flathead taper thread.

https://forums.autodesk.com/t5/fusion-360-design-validate/flathead-screw-taper-depth/td-p/9221562

I need to change the diameter of the flathead bolt from .781 to .725

I have been fumbling around with it but find it time to send out the white flag.

Can this be done?

file attached

Thanks

[wmhazzard]

Here you go. 

[etfrench]

• Create a sketch on the top of the machine screw.
• Project the machine screw to the sketch (if you don't have auto-projection turned on).
• Draw a .725 circle on the sketch.
• Close the sketch.
• Extrude/Cut the unwanted material.

[laughingcreek]

after resizing, I would suggest right clicking on the last feature in the time line and "convert feature to DM".  you don't to retain that history of how the screw got resized.

You can also resize it directly with push pull like this screen cast (notice the bug where push pull defaults to the last value entered.  annoying.) -

https://knowledge.autodesk.com/community/screencast/eb73588b-ccba-4e39-8971-5bb79dc352ab

[Fueler]

Will work with everyone's suggestions and report back.

I should explain why I need to change the diameter of the flat head bolt.

I received some bolts that the head measures .725 and the MC print shows .781 as do most other sources.

???? why?

After a little research these types of bolts follow ASME B18.3 which specs the diameter to be .720 to .781.

MC decided the best move was to show the maximum.

And here we are.

[laughingcreek]

personally I would design toward the larger range of the spec.  There is no guaranty the next batch of screws will be the same as your current ones.  Or you may source from different supplier next time.  I would rather the screw head be slightly sunken in than slightly protruding.

[etfrench]

McMaster-Carr's 3/8-16x3/8" have a .720 head.  With the .781 screw head, you may need to press/pull the taper as well as the flat. 

As @laughingcreek says, it would be best to design for the larger size unless you're doing a one off design where looks are important.