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Posted by desperado on April 29, 2006, 1:47 am
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I bought a set of 3/4 shank carbide inserted boring bars.
I have two of them with broken tips due various mistakes I made.
I was wondering if it is possible to get new carbide inserts and braze
them in.
I hate to buy a new set as these are short shank boring bars and are very
handy in some tool setups.
--
don paolino
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Posted by Richard J Kinch on April 29, 2006, 3:32 am
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desperado writes:
> I was wondering if it is possible to get new carbide inserts and braze
> them in.
http://groups.google.com/group/rec.crafts.metalworking/msg/4a56a9ade678de01
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Posted by Proctologically Violated©® on April 29, 2006, 8:28 am
Please log in for more thread options This is great to know!
But in looking at some chinese tooling, it sort of looks like brass/bronze
brazing rod was used. Mebbe even the fluxless stuff that the hvac peeple
use??
I would imagine the gold coloring on some carbide inserts should be ground
off?
--
Mr. P.V.'d
formerly Droll Troll
> desperado writes:
>
>> I was wondering if it is possible to get new carbide inserts and braze
>> them in.
>
> http://groups.google.com/group/rec.crafts.metalworking/msg/4a56a9ade678de01
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Posted by Richard J Kinch on April 29, 2006, 4:46 pm
Please log in for more thread options Proctologically Violated©® writes:
> But in looking at some chinese tooling, it sort of looks like
> brass/bronze brazing rod was used. Mebbe even the fluxless stuff that
> the hvac peeple use??
I don't know that the color appearance is much help identifying an alloy.
The pricey 45 percent silver stuff still has a gold or brass color.
I forget where I researched this, but the cadmium and high silver alloy is
said to be critical to getting a shock-resistant braze on carbide. The
more common HVAC rods I presume would be more prone to snap off.
I have used the silver/cadmium rods, with the Allstate S-200 flux, on a
number of hand and power tools, and it has always wetted easily, filled and
filleted nicely, and held up superbly, with nothing more than Turbotorch
propane/air flame.
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Posted by president@carbideprocessors.co on April 30, 2006, 12:40 pm
Please log in for more thread options Probably on our web site. (We have a new version of our book Building
Superior Brazed Tools.) Our specialization is in high end applications
such as very narrow saw tips in mills, oil well heads, satellites, etc.
You are correct that the choice of alloy can make a huge difference.
However less expensive alloys can also work very well as the need for
bond strength and impact resistance drops. Arguably you need greater
strengths for a saw tip than for a braze joint in an air conditioning
system. Depending on the braze area (the bigger the better) and the
amount and direction of the force applied a much less expensive alloy
can be suitable.
Tom
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> them in.