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Old 09-18-2016, 08:33 AM
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Default More AXA Blocks

I had to order another 10 AXA block from CDCO, hopefully Frank the Chinaman will be as fast as the last time. I have ordered a new high buck parting tool, so I'll have to open at least 4 of them out to hold the 3/4" tool and making a new series of boring bar holders.
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Old 09-18-2016, 09:16 PM
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I wonder how well a corn-cob roughing end mill will cut them, then finish with a carbide.

At one time all corn-cobs were assumed to be cobalt M42.
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Old 09-18-2016, 09:36 PM
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They must be small toolholders if you have to "open them up" to 3/4"--the Multifix holders I buy will take either 1" or 1-1/4" tools.

There's a good chance you be able to cut them with a roughing end mill; depends on what kind of steel is used. I've seen some toolholders that were soft as butter and others that were pretty tough. I modify my toolholders by adding extra holes so I can mount both a LH and RH tool in one toolholder. Some have drilled and tapped pretty easily but others have been a b*tch...
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Old 09-18-2016, 10:09 PM
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Quote:
Originally Posted by LKeithR View Post
They must be small toolholders if you have to "open them up" to 3/4"--the Multifix holders I buy will take either 1" or 1-1/4" tools.

There's a good chance you be able to cut them with a roughing end mill; depends on what kind of steel is used. I've seen some toolholders that were soft as butter and others that were pretty tough. I modify my toolholders by adding extra holes so I can mount both a LH and RH tool in one toolholder. Some have drilled and tapped pretty easily but others have been a b*tch...

Over the years, I done over 200 of them, some to 5/8" and most to 3/4", a 1/2", 4 flute, carbide end mill does the job. Its just time consuming, they take about 15 minutes, from start to finish. They are very hard, if I go any faster, it ruins end mills. Regular roughing mills will not touch them, maybe a carbide rougher, but the dirt cheap, no brand, Fastenal supplied end mills, do the job, I average about 10-12 block per end mill.
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Old 09-19-2016, 08:32 PM
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I took 3 of the remaining AXA blocks I had to make individual boring bar holders. I don't like holding them in an AXA block, with the set screws, I prefer a sleeve type holder, that hold the bar tightly. Tonight, with some lathe and mill work, I finished up the 3 new boring bar holders. I now have separate holders for;

1/4"
6 mm
7 mm
5/16"
8 mm
3/8"
10 mm
12 mm
1/2"
5/8"
3/4"

all of them now offer a tight solid grip on the boring bar, with no change of slippage.

They are all similar to the one in the attached pictures.
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Old 09-19-2016, 09:53 PM
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Nice I will have to copy.
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Old 09-20-2016, 12:17 AM
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Seems like overkill to me. Over the years I can't recall ever having a boring bar move in a holder and I'm talking some big bars with a lot of torque on them. Do the smaller holders flex? Or is there some other problem?
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Old 09-20-2016, 04:54 AM
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Quote:
Originally Posted by LKeithR View Post
Seems like overkill to me. Over the years I can't recall ever having a boring bar move in a holder and I'm talking some big bars with a lot of torque on them. Do the smaller holders flex? Or is there some other problem?

the smaller boring bars, don't set solidly in the V if the holder, the boring bars have a flat bottom and a too small to wedge against the back of the holder. Their small diameter, off set them from under the set screws. I have no problems with the boring bars above 1/2".
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Old 09-20-2016, 06:27 AM
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Quote:
Originally Posted by platypus20 View Post
the smaller boring bars, don't set solidly in the V if the holder, the boring bars have a flat bottom and a too small to wedge against the back of the holder. Their small diameter, off set them from under the set screws...
Yeah, I see what your problem is--makes sense now. The flat bottom of a small bar isn't going to have a very good base to sit on if there's a V-shaped groove in the way...
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Old 09-20-2016, 10:09 AM
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I have a pretty good collection of tool holders some with the v groove and some without I just avoid the grooved ones if they are not the best choice.
I also use a filler between thte tool and the screws if I am concerned about marking or holding power.
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