General | Drilling hardened steel - Practical Machinist
2006年11月13日 · Con - Has limitations in hardened steels Cobalt - Works up to 58ish RHC Drill - Mild Steel, Some Spring Steel, Some Tool Steel No Drill - Hard Plate, Anti Drill Plate, 440C Stainless Steel Pro - Good for hand drills and most drilling applications Con - Has limits with hardened steel Carbide Tipped - Will drill almost any steel, Hard, Stainless ...
Archive | Drilling Hardened Steel - Practical Machinist
2004年4月3日 · For drilling holes in hardened steel i use the cheap and easy to get carbide tipped masonry bitts The are negative but i regrind them on a diamond grindingwheel They don`t last that long but they are much cheeper I have the best result when drilling in one go on the final diameter and placing some metal underneed because when the drill goes truogh he brakes easaly I have seen it at a toolshop ...
General | Tapping Hardened steel - Practical Machinist
2006年5月5日 · I have a hardened piece of steel I need to tap 1/4x28tpi. The Steel is a Fed Ordnance M14 reciever. It is tempered steel and I was barely able to drill through it with high speed steel. Currently the hole is .219 but I plan to use an Number one carbide drill which should be .228 Here is my question I need a Carbide tap.
General | Drilling hardened steel - Practical Machinist
2013年1月12日 · I'm going to be drilling about 1.25" deep into hardened carbon steel. I assume I will be using a solid carbide drill, since the machine being used will not have through coolant, a peck cycle may be used I assume.
Making Hardened steel soft again? - Practical Machinist
2003年1月24日 · You can probably cut it with a carbide meant for hardened steel. I use the IMCO Power Feeds often on hardened steels. One thing to think about if it is indeed Case Hardened then you will want to check how much you are taking out. Typical Cases are like .020 to .060 deep and if you want to Re Harden then you need to Re Case and Re Harden Good ...
General - Archive | drilling hardened steel - Practical Machinist
2003年5月25日 · Masonary drills are your best bet. We use masonary drills for opening holes in M2 steel Rc 60-62 and also for drilling rough core carbide nibs. Very cost effective opposed to solid carbide drills which will not flex under pressure.
General - Archive | drilling hardened steel - Practical Machinist
2004年11月1日 · You can drill the hardened steel quite easily with a solid carbide drill bit. If you don't want to tackle it yourself (see complicating factors below) talk to your local general machine shop about doing it. Some of the factors that can complicate the process are, 1) You will need to buy a carbide drill bit and center drill.
Drilling work hardened stainless - Practical Machinist
2018年9月21日 · I have some 1" x 1" x 1/8" 304 stainless tube that we drilled 80 holes with a 13/32 drill, there are about 6 holes that my guy didn't press down hard enough with the hand feed drill press causing the bit to rub and not cut causing the material to work harden. So I bought some drill bits from...
Favorite drill for hardened 4140? - Practical Machinist
2006年6月14日 · Drilling .332" holes 1.5x deep in 4140 @ 42Rc. Cobalt twist drill isn't lasting more than 10 holes. Drilling operations done in VMC without thru tool coolant. Maybe a powdered metal drill? I am just a little worried that carbide will chip/fracture too easy?
General | Drilling Hard Tool Steel - Practical Machinist
2015年1月23日 · Here it is aluminum die cast, I have to drill perk holes in cores in already hardened tool steel 46 to 48RC material is Viscount or CPM that gets a nitride coating witch gets up there pretty hard. The job I am running tonight I am drilling (its almost 13 times the diameter) 11/32"dia 4.42 deep with a cobalt twist drill then tap 1/8"-27 NPT.