| 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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