The Breakroom > The Water Cooler

So muchfor pilot holes

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Will_D:
I always thought you spooted a hole and o[pened it up with a seies of drills to finasl size!

Not here:

Warning this is about weapon making!!

https://www.youtube.com/watch?v=J_hQcIBbPME

Its an awesome series of videos about cnc machining ally

About 27 mins in he drills 3/4 holes straight in

Pete.:

--- Quote from: Will_D on September 10, 2017, 06:08:13 PM ---I always thought you spooted a hole and o[pened it up with a seies of drills to finasl size!


--- End quote ---

Nope, pilot hole at 1/4-1/3 size then drill the hole. Stepping-up in small sizes is a good way to snag & snap the drill especially if the work is not fixed down.

awemawson:
Agreed Pete. But when people are using low powered machines at or above their capacity it's sometimes necessary to step up to reduce the power needed to drill the hole.

sparky961:
At work, I regularly use a 1.781" diameter spade drill in 304 and 316 stainless.  No pilot hole, as spade drills really don't appreciate them.

Even though it's isn't exactly a "hobby" lathe, I can still stall it if I'm too ambitious with the feed.

SwarfnStuff:
Sparky,
    That is a new one to me. I have never heard of spade drills for metal, Wood n plastic yes but my little brain is struggling with using them in steel of any sort.
    Special type??????   :Doh:

John B

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