Center Drill Bits

Hi, i have recently recived some center drill bits as recomended by another member, i know what they are and how to use them.

I was just wondering if anyone had any advice or Tip when using them, i have been using them to make nema 23 motor mounts for my cnc machine:

http://www.mycncuk.com/forums/photop...1_DSC05057.JPG

Sorry kip i hit the wrong button, kips posts are below:

Quote:

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Be careful when using small ones on hardened steel...they break!

And use a scriber rather than a marker pen as it's better for accuracy and never rely on a piece of metal being "square" when marking out.... :D

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Yes it did take me a few go's to get the holes right, i managed to get the holes close enuff that i could then file out a small amount so my screws would line up with the motors.

Now i have a template i just use that to make/mark out new plates and so on:

http://www.mycncuk.com/forums/photop...1_DSC05172.JPG

There are some really naff centre drills around, regular PITA when they snap off. I got some cheap, centred 2 holes then lobbed the lot straight in the bin.

Caveat emptor, I've gone back to Plan A, don't use anything but Dormer :D

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Originally Posted by Kip

I have a quick bodge/cludge for marking out...Draw the part in CAD and then print it 1:1 and just centre punch through the paper :toot: :D Works a treat ;)

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Thanks kip i didnt think of that, i'v downloaded the file ill take a look soon !

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Originally Posted by Robin Hewitt

There are some really naff centre drills around, regular PITA when they snap off. I got some cheap, centred 2 holes then lobbed the lot straight in the bin.

Caveat emptor, I've gone back to Plan A, don't use anything but Dormer :D

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I got mine from ebay, dont think they cost much more then £10. I take my time with them and they seem to be ok, now i think just a small drill bit would have more then likly done the trick anyway :)

CM

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Originally Posted by CheekieMonkies

i managed to get the holes close enuff that i could then file out a small amount so my screws would line up with the motors.

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You really need CNC it makes it so easy and everything lines up just perfect. No more swapping centre drill then bit then countersink/bore on every hole :D

I draw everything with AutoCad, convert the milling to G code and overlay the .dxf file on the cut file. Then I can use the "Move to hole" feature which puts me on the hole nearest the mouse.

:) now i can mount my motors, my machine can move/work, guess what i will e making with my machine once its up and running :D

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Originally Posted by CheekieMonkies

:) now i can mount my motors, my machine can move/work, guess what i will e making with my machine once its up and running :D

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First thing I made when I got my mill CNC'd was a suds pump :D

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Originally Posted by Robin Hewitt

First thing I made when I got my mill CNC'd was a suds pump :D

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Yea i was thinking i'm gonna need to keep things cool if i'm doing ali cuts ? i was thinking of having a vac to clear the "chips" and my compressor blowing to keep the cutter cool ?

Have you got any pics of your pump?, this cnc stuff is leading me into so many "new area's" of making things so on, i love it i wish i had tuned in at school and gone down this path for a career.

Cheers,
Lee