carbide drills

[MBG]

Would it be a wise choose to switch to carbide drills since all of my HSS drills break? What I am doing is cutting pure iron round stock (production) about 500 a day I drill but I got to go easy on the drilling or else the HSS would break. Is there any benefit on going to a carbide drill to be able to drill faster and give more pressure while drilling?

[mxtras]

HSS in iron should last a very long time. Why are the drills breaking? Something is not right.

Carbide tools break also. I would find out why you are breaking your drills before you spend the money to start snapping more expensive drills. If you are wearing them out quickly then switch to carbide.

Scott

[MBG]

Originally Posted by mxtras HSS in iron should last a very long time. Why are the drills breaking? Something is not right. Carbide tools break also. I would find out why you are breaking your drills before you spend the money to start snapping more expensive drills. If you are wearing them out quickly then switch to carbide. Scott

well they don't break until about 150 or so.... Then they break. I am running production and getting paid by the part so time is money here. When I push it I can make 14 an hour if I dont i'm making lik 9.... soo you know damn well i'm going to push it hah.. I just wnat to know if carbide will be able to hold up when i'm "pushing" it harder....

[mxtras]

Carbide is more brittle than HSS - it won't flex and twist the way HSS will, so in this case, I would not recommend carbide. I would recommend changing the drill after 125 holes or stopping for 15 seconds to grind new edges on it.

Scott

[MBG]

Originally Posted by mxtras Carbide is more brittle than HSS - it won't flex and twist the way HSS will, so in this case, I would not recommend carbide. I would recommend changing the drill after 125 holes or stopping for 15 seconds to grind new edges on it. Scott

yea... that is what I wanted to avoid is the time taking it out and putting it in... You know time is money.. I wnat to make the 14 an hour not the 8 an hour ahhahah

so what about another kind of drill is there any kind?

[Mcgyver]

whats different between the 1st one and the 150th one? tool wear. sharpen the drill if its big enough, if not toss it. also, what dia, and what do you mean by pure iron?

[MBG]

Originally Posted by Mcgyver whats different between the 1st one and the 150th one? tool wear. sharpen the drill if its big enough, if not toss it. also, what dia, and what do you mean by pure iron?

the difference between the 1st and the 150th? really nothing finish is the same.. Just when I push it into the workpeice it just snaps... The diameter is .108 or something like that got it at the shop...


and it's pure iron I import it...

[mxtras]

I figured he meant cast iron, Mcgyver. Don't know about you, but I can drill cast for a week with the same HSS drill - it's like drilling butter.

Scott

[MBG]

Originally Posted by mxtras I figured he meant cast iron, Mcgyver. Don't know about you, but I can drill cast for a week with the same HSS drill - it's like drilling butter. Scott

no it isn't cast iron... It is pure iron like extruded or whatever I dont know but it's not cast it's a round round like 1/8 thick

[Mcgyver]

Originally Posted by mxtras I can drill cast for a week with the same HSS drill - it's like drilling butter. Scott

I've machined a cast iron many times but never in volume/production so I can't say first hand what the rate of tool wear is. I do like working it and agree the good stuff machines like butter, but that’s not necessarily the same as low tool wear and some cast is better than others and it can be abrasive. As drilling the hole isn’t the problem, but rather breakage after 10 hours of going at it, I figured it had to be tool wear + I’m still not sure what he’s drilling.

MBG I can’t follow your description – pure iron? round round like 1/8 thick? Like pure iron is in the element Fe?

[Mcgyver]

you guys type too fast, Scott, your earlier post basically says the same as mine, sorry either didn't see it or was too slow!

[mxtras]

I am with you on this one Mcgyver - I don't get it. Pure iron?

What is the ASTM # for the material, MBG?

Scott