Thread: Center Drill Bits
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22-06-2008 #1
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:
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23-06-2008 #2
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.
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14-05-2009 #3
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14-05-2009 #4
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14-05-2009 #5
Forget centre drills, they are a throwback to earlier days and were designed for putting in the support holes for centres on lathes, hence the name.
No commercial CNC shop would dream of using centre drills today, instead using what are called NC spotting drills.
These are very stiff short fluted drills that will start a hole off without wander and not break like the flimsy centre drills.
Nearly the same results can be obtained using a good quality stub drill.
John S.
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14-05-2009 #6
And avoid "UK Drills" on ebay.
I bought £30 worth of cheap Jobbers bits, the first two I tried broke almost instantaneously, the rest followed them quickly in to the bin
Hi Kip
My Z axis is delayed. First I'm remaking my standoffs for the milling table. The previous set was too clever, interchangeable bolt holes in different sizes. I soon lost precision.
This time I'm making 20 in 5 different threads, all cut from the same 3/4" thick steel bar and all 3/4" thick
Robin
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14-05-2009 #7
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