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Posted by Tom Gardner on April 14, 2006, 7:44 pm
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>> Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the
>> center of a face. I need to put a 1/16" radius on the two edges on one
>> of
>> the sides. The last one of these I made took hours with itsy-bitsy
>> (technical term) files and emery paper. I have a "Round-over" end mill
>> with
>> a 1/2" radius but I've never seen one that small. Do they exist? I DID
>> Google and looked at catalogs for all the usual mill suppliers. I could
>> make it in two parts but that would be a wash, time wise.
>
> It sounds to me as though you would do better in cutting the
> slot with a conventional milling cutter (for a horizontal spindle mill)
> instead of an endmill, and while we're about it, (assuming that you will
> be making enough of these to make it worthwhile) you can get another
> milling cutter a bit wider reground by a good sharpener to produce the
> radius on both sides at the same time. Perhaps even one could be ground
> to produce the slot at full depth and both radii in a single pass, so
> you don't have to be constantly changing cutters.
>
> Good Luck,
> DoN.
>
> --
> (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
> --- Black Holes are where God is dividing by zero ---
I only have to make one Don, and the slot is already done with a cutter. I
just need to radius the sides of the slot. The part will be a guide for
.110" x .017" flat wire that will be poking into the slot from about a half
inch away, very fast. Then the wir gets cut and pulled out...kinda'. The
radius is only to keep the cut edges from hanging-up as it gets inserted
into the slot in the block and make sure it ends up in position.
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Posted by Robin S. on April 14, 2006, 8:22 pm
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>
> I only have to make one Don, and the slot is already done with a cutter.
It doesn't seem economical to buy any specific tooling for this part if you
one need one unit. It sounds like the actual dimension and form of the rad
is somewhat unimportant, as long as there is something there to catch your
wire.
If I didn't have a die grinder, I'd use a file too. Why did it take 2 hours
of bench work last time (perhaps I'm missing something)?
Regards,
Robin
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Subject: Re: Radius slot in O-1
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>
> I only have to make one Don, and the slot is already done with a cutter.
It doesn't seem economical to buy any specific tooling for this part if you
one need one unit. It sounds like the actual dimension and form of the rad
is somewhat unimportant, as long as there is something there to catch your
wire.
If I didn't have a die grinder, I'd use a file too. Why did it take 2 hours
of bench work last time (perhaps I'm missing something)?
Regards,
Robin
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Posted by Tom Gardner on April 14, 2006, 10:41 pm
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> It doesn't seem economical to buy any specific tooling for this part if
> you
> one need one unit. It sounds like the actual dimension and form of the rad
> is somewhat unimportant, as long as there is something there to catch your
> wire.
>
> If I didn't have a die grinder, I'd use a file too. Why did it take 2
> hours of bench work last time (perhaps I'm missing something)?
>
> Regards,
>
> Robin
The slot is only 1/8 and it's hard to get a good swipe at it with the files
and the O-1 is tough and I'm lazy and I bore easily. But, the first one has
been in service for 18 months and still perfectly smoothe. I'll buy the $34
mill from MC, it's solid carbide and there are two more similar parts I need
to make so I can justify it. This machine will make me the largest producer
of flat wire brushes in the world! Bwahhahahah!
http://www.bakedeco.com/a/butcher-block-brush-4439.htm
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Posted by DoN. Nichols on April 14, 2006, 8:53 pm
Please log in for more thread options >
> >> Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the
> >> center of a face. I need to put a 1/16" radius on the two edges on one
[ ... ]
> > It sounds to me as though you would do better in cutting the
> > slot with a conventional milling cutter (for a horizontal spindle mill)
> > instead of an endmill, and while we're about it, (assuming that you will
> > be making enough of these to make it worthwhile) you can get another
> > milling cutter a bit wider reground by a good sharpener to produce the
> > radius on both sides at the same time. Perhaps even one could be ground
> > to produce the slot at full depth and both radii in a single pass, so
> > you don't have to be constantly changing cutters.
[ ... ]
> I only have to make one Don, and the slot is already done with a cutter. I
> just need to radius the sides of the slot. The part will be a guide for
> .110" x .017" flat wire that will be poking into the slot from about a half
> inch away, very fast. Then the wir gets cut and pulled out...kinda'. The
> radius is only to keep the cut edges from hanging-up as it gets inserted
> into the slot in the block and make sure it ends up in position.
O.K. For that, you could live with a bevel cut with a 90 degree
conventional milling cutter doing both sides at once -- or even using a
countersink as an end mill. (Yes - I have done that last -- before I had
my horizontal mill and some of the interesting cutter shapes.
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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Posted by Tom Gardner on April 14, 2006, 10:45 pm
Please log in for more thread options >
> O.K. For that, you could live with a bevel cut with a 90 degree
> conventional milling cutter doing both sides at once -- or even using a
> countersink as an end mill. (Yes - I have done that last -- before I had
> my horizontal mill and some of the interesting cutter shapes.
>
> Enjoy,
> DoN.
I've heard about you and your "Interesting Shapes"!
...I could use a 90 deg cutter and...maybe I won't spend the$34.
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>> center of a face. I need to put a 1/16" radius on the two edges on one
>> of
>> the sides. The last one of these I made took hours with itsy-bitsy
>> (technical term) files and emery paper. I have a "Round-over" end mill
>> with
>> a 1/2" radius but I've never seen one that small. Do they exist? I DID
>> Google and looked at catalogs for all the usual mill suppliers. I could
>> make it in two parts but that would be a wash, time wise.