Thread: Center Drill Bits
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
Would be nice to see some pics if you get a chance Robin, will defo come back to this at some point.
FWIW, a picture :D
Now that looks KOOL !
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.
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
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
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