Center Drill Bits

[Lee Roberts]

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 :D Works a treat ;)

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

[Lee Roberts]

:) 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

[Robin Hewitt]

:) 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

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

[Lee Roberts]

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

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

[Robin Hewitt]

Have you got any pics of your pump

I have the working drawing if that's any good, the pump is up at my shop.

That's a 40mm impeller, (I just happenned to have some 40mm diam polyurethane)

I drive it with a DC motor through a variable voltage regulator, that way I get to adjust the flow using a pot on the front of the machine. Works good :D

[Lee Roberts]

Would be nice to see some pics if you get a chance Robin, will defo come back to this at some point.

[Robin Hewitt]

FWIW, a picture :D

[Lee Roberts]

Now that looks KOOL !

[Robin Hewitt]

Now that looks KOOL !

Maybe that's why it's called koolant? :D

[bogstandard]

About the cheapest spot drills in the UK I have found are here. Put a search in for all diameters and go to the bottom of the second page then the third.

http://www.engineeringsupplies.co.uk...11=192&12=&13=

They are very good quality, both the Cobalt and Carbide, and if not really abused, should last almost forever. For £20 to £30 you can kit yourself out with a decent range of sizes and angles up to 8mm, over that, as in all places, they get expensive.

I tend to use the 120 degree ones, as that almost matches the standard grind of a normal twist drill of 118 degs. For holes that have a countersink requirement, I use the larger 90 degree ones to do the countersink first, then drill down with a normal drill from that, two ops in one.

Hope this helps

Bogs