1/2 inch

[jkan101]

If I needed to tap a hole for a 1/2 inch plug what size drill bit would I use to drill the hole?
Would it be a 7/16 drill bit or smaller.

Thanks

Joe

 

[deadbeat]

You should be able to google the correct drill for your tap since thread count makes a difference on drill.


1/2-13 - 27/64
1/2-20 - 29/64

 

[scdiveteam]

Joe,

I use a 1/2 drill for the hole for my shaft inserts with keyway grooves non tapped. If it is just a plug or insert, this is one way of doing it without tapping

My inserts area 1/2 " nominal sized OD.

I machine them to .494 then lightly sand the inserts down to .492 and they fit just right with room for the epoxy interface gap.

Good luck,

Rick

Here is a detail drawing, hope it helps:

 

[billiardbum]

Joe,

I use a 1/2 drill for the hole for my shaft inserts with keyway grooves non tapped. If it is just a plug or insert, this is one way of doing it without tapping

My inserts area 1/2 " nominal sized OD.

I machine them to .494 then lightly sand the inserts down to .492 and they fit just right with room for the epoxy interface gap.

Good luck,

Rick

Here is a detail drawing, hope it helps:

Man Rick you have too much time on your hands

 

[jkan101]

LOL yes he does--however ty both for responding.

Joe

 

[JoeyInCali]

Joe,

I use a 1/2 drill for the hole for my shaft inserts with keyway grooves non tapped. If it is just a plug or insert, this is one way of doing it without tapping

My inserts area 1/2 " nominal sized OD.

I machine them to .494 then lightly sand the inserts down to .492 and they fit just right with room for the epoxy interface gap.

Good luck,

Rick

Here is a detail drawing, hope it helps:

He's tapping the hole for a threaded insert.
1/2 20 I bet.
29/64 and bore the top of the hole at .498".
That way , no glue line and pressfit top with threaded bottom.

 

[jkan101]

Deadbeat I did google it and still couldn't find it, it is a 1/2-20 tap ..again thanks

 

[jkan101]

Good guess joey --thanks

 

[tsp&b]

This should help.... http://littlemachineshop.com/Reference/tapdrill.php

 

[jkan101]

Thanks Todd--I will bookmark that page.

 

[scdiveteam]

LOL yes he does--however ty both for responding.

Joe

Joe,

When you said plugging a hole, I thought you were plugging a hole to redo a shaft or a pin??

Rick

 

[jkan101]

Rick,

I t was to redo a shaft, I just didnt give you enough information on what I was doing--Joey hit it on the head. Your method is also very good also, next time I will try yours instead of threading the phenolic plug I am gonna use, again Thanks

Joe

 

[jkan101]

found a better drill and tap table for anyone who needs it. http://www.boltdepot.com/fastener-information/US-Tap-Drill-Size.aspx

Joe