Note to Self: Drill Bit Sizes

[Adam Baker]

When drilling holes in a body for photoetch bits, its a good idea to verify the drill bit size.

Theres a huge difference between .025 inch and .025 millimeters...

Working on a build, that required .025mm holes, but I used a .025" bit. Thankfully I was able to recover by filling the holes w/ .025" styrene rod, and then redrill w/ the correct bit.

But it was an "Oh #$*%!!" moment when I discovered the error.

 

[paddy]

I still think you are confused.......... .025mm is less than 1000th of an inch and you wouldn't get a drill bit that size

Do you mean .25mm which is about 12thou and .025" which is 25thou :cheer:

 

[Adam Baker]

Yea, you're right, its .25mm which is .009", not .025mm which is .0009". Still a pretty good screw up, haha.

 

[jknaus]

Oops
James

 

[Adam Baker]

Took a picture last night of the bits. The .25mm is on the left and the .025" is in the right.

And here you can see one of the panels I've already fixed. You can kinda make out the styrene rod I filled the hole w/, and then you can see the new hole drilled in it.

 

[paddy]

good save
Its a problem we have in the UK in all aspects of life where we are half metric half imperial.
Beer and Milk comes in pints, wine and petrol comes in litres. We buy petrol in litres but our cars do x miles to the gallon !! Road signs are in miles, shorter distances are usually meters and kms.
I worked all my life in engineering, half the machines were imperial half metric in the tool room Drills were even worse because we had metric, imperial and wire gauge !! :laugh:

 

[Adam Baker]

I know what you mean! I got a 2 year college degree in machining, so that was an issue I had to deal w/ in the past, and currently I work as a CAD designer for a large company that deals both nationally & internationally, so we have both metric & imperial dimension prints, and sometimes I catch myself trying to use the wrong dimensions for things.

 

[jknaus]

Nice save. In Canada it is all metric unless you are an older person from pre metric days. My partner and I had to do some measurments for work and we ended up with things like "gap of 1mm for 10 inches". Boss just looked at us and shook his head.
James

 

[Tankbuilder]

Nice save. In Canada it is all metric unless you are an older person from pre metric days. My partner and I had to do some measurments for work and we ended up with things like "gap of 1mm for 10 inches". Boss just looked at us and shook his head.
James

I'm in Canada too and I just love the dimensions give for lumber. Usually it's 1"x2" x 8: and so on. Sheet stuff is often a mix of Imperial and metric as in 11mmx4'x8' plywood but the plywood is slightly longer than 8" and about an inch wider than 48".

Cheers