View Full Version : Step Drill Bits are awesome!
01-03-2006, 10:54 AM
I picked up a 3-pack at HF the other day and I must say I'm impressed. I was surprised at how fast I removed the trunion rivets - took less time than I had ever done in the past! Just center punch the top of the rivet and drill. It dug through the rivets in no time and took only one pass. In the past I balked at these things, and used my index bits to step up size by size until the hole was done. I'm going to use this on my next 80% blank build. The trick to using these is to make sure the hole is centered and you're set! You can easily "walk" the bit if you are off-center because the sucker is so thick, you won't have to worry about breaking the bit! :D
I see the 3-pack is now discontinued, but it was on sale at my local HF for $15 and had all three sizes. :) This is now on my "must buy" list - strongly recommended to try it!
I like this so much that I'm going to pick up a few spares. This is the HSS version, but that 3-pack has a TiN-coated version, which I prefer for gun work:
01-03-2006, 04:23 PM
I've got a similar set. GREAT for removing rivets. They stay on center really well. Also great for drilling out the holes for the underfolder. Makes that a quick and easy operation.
01-05-2006, 10:48 AM
Yes I noticed that too - I had to make the most basic of center punches and they centered really well.
I got one off-center because it walked, and since I was so pleased at how fast it was cutting, I leaned down really hard to walk it back to center, and didn't realize it was already into the trunion! Shame on me, but it wasn't too bad and I've seen vendor demills look worse. That hole will be covered by the barrel anyway so no one will ever see it.
I'd like to find one that was in a range of index bits - for example sizes 25-16 or something like that, so the step cuts could be a little more accurate.
I too thought about the rear holes for the folding stock. That big hole has been the bane of my existence in trying to get it trued up. Seems like when you get them that big they are always off "just enough" to notice. Makes sense these would keep that from being so bad!
01-05-2006, 08:47 PM
On the one and only underfolder I built, I eyeballed the center of the big holes and drilled away. I drilled almost to the full size of the hole. I left a little ring for myself to file away. Didn't take long at all.
01-20-2006, 04:59 PM
Good info. Been wondering about those step bits for a while.
01-20-2006, 05:07 PM
Me too, I have seen them and thought "no way thats gonna work", glad to know it does. I am gonna have to try them out...
01-20-2006, 05:11 PM
Yep, they are great to have around the shop. I buy the Unibit brand name, they cost more but they last a long time at my business. We use them to drill hole through automobile firewalls for wire running. They cut fast and clean through most metals and plastics.
I'd never thought about using one to drill rivets out, thanks for the tip.
01-20-2006, 05:11 PM
I opted for a drill press first and got it for christmas, NOW i want one of the step bits also.
Those step bits are awsome! I used them to drill the holes for my underfolder.
01-20-2006, 05:54 PM
Good tip. I will pick some up.
ozzy the nuke
05-27-2006, 08:27 PM
Tried the HB stepped drills. Like Pookie said. They are awesome!!!
05-27-2006, 08:32 PM
Yes sir, sweet item to have. What's a good speed to run them at though? I always end up getting things too hot.
ozzy the nuke
05-27-2006, 08:38 PM
I like to run slow (480 rpm) and take my time in case I need to make a correction. These are stiff enough that if I am off center I can tilt the rifle and walk the bit toward the center. I actually like these better than center drills.