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Post by spoonover on Aug 8, 2010 13:27:44 GMT -5
Savage breech plugs is not wanting to tap out, have a old tap and two new.
Recess is nice, the #21 drill went through. Tap is going to break if I push it any harder.
Can get three turns on vent liner but that is all.
Do I have to heat the BP and take out some of the temper?
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Post by boarhog on Aug 8, 2010 16:01:19 GMT -5
I wouldn't heat unless you know all about heat treating. Your #21 bit may be worn, or undersized. When using the tap, apply cutting oil and work the tap in and out a tiny bit at a time. Perhaps the new 10-32 tap will be a little sharper. If you have a new #21 bit, see if it will cut a tiny bit more out of the spot you're trying to tap. It's hard to make suggestions since I'm not feeling how the tap is cutting myself.
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Post by Richard on Aug 8, 2010 16:24:09 GMT -5
If you have carbon impacted in there, you might need a cobalt tap to cut it. Like boarhog stated, one needs to feel what the tap is or is not doing?
Did you drill completely thru the plug? If you only went in a short ways with the drill, the point of the tap might be hitting built up carbon further in.
Richard
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Post by spoonover on Aug 8, 2010 17:57:41 GMT -5
Did drill all the way through, two new #21 bits and taps from Sears and Westlake. Have some Carbon Killer I will soak the BP , maybe loosen it up some. Carbon has to be the culprit as I had never cleaned the BP for years till got to this site. I live in the KCMO area, some one has to have a cobalt tap around here? Boarhog no nothing about heat treating so I WILL NOT BE DOING THAT.
Thanks you men great
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Post by Richard on Aug 8, 2010 18:06:10 GMT -5
If you have a Grainger industrial supply around you can get one from them. Also MSC.com, McMaster Carr or any industrial supply should be able to supply a cobalt tap.
Richard
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Post by spoonover on Aug 8, 2010 18:41:55 GMT -5
Grainger, yes tomorrow I will give them a call and pick it up if they have one in stock. Thanks Richard
No hurry to get the job done as a heat wave is on us. Working all day in this heat leaves no desire to go shooting, no cooling rod made up yet, barrel will be 100ยบ without firing a shot.
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Post by killitgrillit on Aug 8, 2010 18:59:28 GMT -5
Go to mcmaster carr, there cheaper and while your at it order ya a copper cooling rod from them,
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Post by boarhog on Aug 8, 2010 20:11:47 GMT -5
I only recently learned about cobalt drills and taps, thanks to Richard. I have an order to MSC ready to call in tomorrow morning. On it are 10-32 and 1/4 -28 cobalt taps, plus several other goodies. I usually place orders from one of their sale fliers. I need to know the proper size bit to use for a 1/4-28 hole
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Post by edge on Aug 9, 2010 7:04:47 GMT -5
IMO, you are trying for a 75% thread which is too tight of a fit!
50% thread is fine.
I would not be afraid to drill it with a #18 ( 0.1695 ).
When tapping do not go more than 1/2 turn before backing the tap to break the chip.
1/2 in, 1/2 out, 1 in, 1/2 out until you get to the depth you want. If it feels like it will break, then use more oil and only 1/4 turn or less if need be.
If it breaks and you were taking baby cuts you might get it out, but if you were taking a big cut then you won't get it out without carbide and a lathe or milling machine.
edge.
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Post by ET on Aug 9, 2010 9:39:18 GMT -5
I only recently learned about cobalt drills and taps, thanks to Richard. I have an order to MSC ready to call in tomorrow morning. On it are 10-32 and 1/4 -28 cobalt taps, plus several other goodies. I usually place orders from one of their sale fliers. I need to know the proper size bit to use for a 1/4-28 hole For a 1/4-28 my chart calls for a #3 drill that is .213". Ed |
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Post by smokeless77 on Aug 9, 2010 17:47:02 GMT -5
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Post by spoonover on Aug 10, 2010 7:14:26 GMT -5
Edge, John, #18 size did the trick, must have work hardened the BP, after drilling and some more 1/4 turns it got easier and did some cutting after a full turn. Carbon killer (slip 2000) got out all the carbon after a night of soaking because the tap was coming out oily instead of coming out black (thanks for the heads up Richard, carbon and cobalt tap).
Killit, I have a lot of lead I use for fish (spoonbill) weights, have a 1/2'' aluminum tube maybe melt it full of fish weights and will have a cheap cool rod!
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Post by jray57 on Aug 10, 2010 10:49:45 GMT -5
Did you drill all the way thru the BP with the #18? I have always used a #21 to drill out the carbon. Did the #18 open up the "fire channel" any? If so I guess this won't be a problem?
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Post by spoonover on Aug 11, 2010 6:46:59 GMT -5
J, went through all the way, not sure on how much steel was taken? After a few shots carbon will close the bore to any size we want to keep it drilled out to. At one time my fire channel was very small from not knowing any better.
I have not blown the Savage up from ignorance, at one time my vent liner was over 50 thou and Lil gun (do not use Lil Gun!!) powder was falling in the action when I would load the Savage! Thanks to this forum I know what powders to use and vent liner care.
Rick
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