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Old 05-11-2013, 10:42 PM   #231 (permalink)
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Good idea. It rotates, I will see how far.
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Old 05-12-2013, 05:56 PM   #232 (permalink)
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using a carbide spade drill or spot drill you can get through a center just fine. i drill through 62-64 D2 tool steel all the time. just DO NOT let it chatter.
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Old 05-12-2013, 08:44 PM   #233 (permalink)
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The problem is the length. I turned the tip flat and spot drilled a starter hole but I don't have a carbide drill long enough. And this hard drilling stuff is not something I get into often enough to tool up for.
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Old 05-14-2013, 07:57 AM   #234 (permalink)
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well, how deep is the hardening? Try punching a carbide in a ways and see if it gets easier, maybe most of the depth can be finished slowly and patiently with HSS or the like.
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Old 05-15-2013, 12:25 AM   #235 (permalink)
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chances are if its a center it will be thru hardened. if you are trying to make something for the MT i would suggest buying an MT drill, lopping it off and using the shank. these are only 40-45HRC in the shank and much easier to machine.
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Old 05-15-2013, 03:37 PM   #236 (permalink)
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So question for you all... Once the two machines get delivered tomorrow, I will have just about everything necessary to start work. So... What exactly do I make to start?
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Old 05-15-2013, 03:59 PM   #237 (permalink)
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So question for you all... Once the two machines get delivered tomorrow, I will have just about everything necessary to start work. So... What exactly do I make to start?
dummy 12gm!
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Old 05-16-2013, 08:40 PM   #238 (permalink)
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Originally Posted by ApoC_101 View Post
well, how deep is the hardening? Try punching a carbide in a ways and see if it gets easier, maybe most of the depth can be finished slowly and patiently with HSS or the like.
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chances are if its a center it will be thru hardened. if you are trying to make something for the MT i would suggest buying an MT drill, lopping it off and using the shank. these are only 40-45HRC in the shank and much easier to machine.
Thats what I thought too Apoc. I specifically bought an import to work on because I figured it would be case hard with a soft center. I figured I would have been thru the case hard by the time I cut the flat on the front (about .450dia) when I saw it was still hard I used a 1/4" carbide spotting drill to start a pilot and see how deep the harding was. I got about 3/8" before I shattered the carbide. So at this point I tend to agree with rednecksniper that its thru hard.

What I am trying to do exactly is make a thru spindle misting system to help me bore barrels a little faster and easier. so I was going to put a 3/8" hole thru it and run an air line from the mister to the tip of the center. then when I remove the reamer while boring it will blow out the chips and apply fresh coolant. So I am using this in the head of my lathe and its got a MT 5 taper so the cheapest drill I can find is 250 I already got a quote from the edm shop of 175.
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Old 05-16-2013, 08:54 PM   #239 (permalink)
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So question for you all... Once the two machines get delivered tomorrow, I will have just about everything necessary to start work. So... What exactly do I make to start?
flash lights are always fun

Photon Fanatic Custom LED Flashlights

or some rain covers
or dummy 12 grams
or make a mug from a tank
or how about some more t nuts
or a couple machinist jacks
or a work stop
or soft jaws (mill)
or soft jaws (lathe)
or soft face hammer
or a fixture to make any of the other things mentioned
or a giant anime style mech
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Old 05-18-2013, 01:52 AM   #240 (permalink)
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one tip is NEVER pilot drill hard material, your on size drill will chatter and shatter to high heaven.

if you need the form i would suggest either drawing it back to a good 30 HRC or full annealing, since you only need the geometry not the hardness.
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