i have to say not all the time on the drill bits that cheep is junk .the bits i buy are real cheep ones from a surplus store they are a cobalt/steel. they are better then any of the brand name stuff i have seen around here i have only gotten one bad bit in like the 8 years i have been getting them . i am bad for busting bits and burning them up . the bits are some mill shop grade tools and there cheep . so look around at the local surplus supply for them you may find them there too .
EZ - I'll drop off some tool and die grade bits for you. They're letter sizes but will work for what you're doing. Keep'em, brake'em do what you want with them. they are plenty sharp and a very good grade of steel. I got them from a buddy for fixing a couple of snowblowers for him. So now I'll pass them on to you. I think I only used four or five of them.
I have had amazing luck drilling with step bits from Harbor freight. At the shop we drill stainless strap to mount tanks and it will eat a bit in no time flat. They had the 3 piece set on sale for 7.99 and I have drilled tons of holes in mild steel and stainless up to 3/16 thick and they are holding up great.
3 Piece Titanium Nitride Coated High Speed Steel Step Drills
3 Piece Titanium Nitride Coated High Speed Steel Step Drills
I sharpen my drill bits on a belt sander, and it works great.:thumbsup: I allways start with a small pilot hole then step up.(take your time,this is not a race)Try to keep your bit straight (use a drill press when you can) Drill at a slow speed so you are cutting and not burning the bit up,this is a must with stainless.If you burn up a bit in a hole you will have a hard time drilling that hole,and may need to grind it (and that sucks:doah
allways use a drill bit lube
allways use a drill bit lube
I sharpen my drill bits on a belt sander, and it works great.:thumbsup: I allways start with a small pilot hole then step up.(take your time,this is not a race)Try to keep your bit straight (use a drill press when you can) Drill at a slow speed so you are cutting and not burning the bit up,this is a must with stainless.If you burn up a bit in a hole you will have a hard time drilling that hole,and may need to grind it (and that sucks:doah allways use a drill bit lube
allways use a drill bit lube
SHARP ones... Drill bits get dull and need sharpened like anything. My dad works for a place that does stainless steel only and get a bunch of drill bits beyoond what they want to save and usually they still work good.. But a good sharpening always fixes them..
unless it's some kind of Horrible Freight POS drill bits made of lead or some crap that just can not be a drill bit because it's crap.. :hammer: Good drill bit, semi sharp.. to real sharp..
unless it's some kind of Horrible Freight POS drill bits made of lead or some crap that just can not be a drill bit because it's crap.. :hammer: Good drill bit, semi sharp.. to real sharp..
