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Hi everyone after telling you about the need to buy a thread repair set in the "Today I acquired" thread someone answered asking about being updated about how they perform and someone else wasn't convinced about the quality of the set as they're not the more famous Heli-Coil brand which is became the colloquial name for this type of... I don't even know if call them tools or what.
I've always known them as Heli-Coil years before I've started to work in a machine shop.
Anyways I've been in need of repair the damaged thread of the studs on my engine driven welder carburetor.
They were loosen and vibrations destroyed the threads.
I've firstly attempted to run a tap made new studs and used a bunch of thread locker .
It worked on 1 out of 2 because I've been able to cut deeper threads but on the other side they stripped very easily, no space to go up to M8 so the Heli-Coil was the only practical solution (impractical one was trying to weld it, drill and tap back to M6).
Anyways went on Amazon looking for thread repair sets and among all the Chinese metal cases set or the single size ones sold in blisters or even nylon bags I've had to choose between the original Heli-Coil and those V-Coil.
I've chosen them just because they are available I different sizes and pitches but especially because they were the only ones which included a small case.
After buying I've seen a video review about them and they held more psi than the original Heli-Coil.
Today they came in the mail and I've just finished using them.
They come in this little plastic box, very nice and compact, it has a spring loaded latch which keeps it closed.
I've found this little detail very nice.
That's the content, we have
A 6.3mm HSS bit
A 7.3x1 mm tap
35 maybe 6mm long coil inserts
The installing tool
And the punch to break the bent coil portion needed to drive the inserts through the threads.
After the first use I can say they are pretty good actually.
I love the build quality of the case maybe the downside of it are the various components locations that make hard to take the bit and the tap out as even my skinny fingers can't take them out easily.
The tap which should be just a manual tap as a part from the 3 flute construction it doesn't have any geometry which makes you think it can be a machine tap.
But it actually evacuated the chips just like a spiral tip tap.
This can be both bad or good upon the job.
I have to say it's a good one as it cut very easily self centering itself in the hole.
I'm very happy with it.
And one little feature I like the most is the centre on the square which helps a lot if used on a machine as you can use a live center for example to guide it straight.
Usually small taps don't have this little divot but a sharp pointed end.
The drill bit, it's just a ground and polished bit, no special coatings.
It looks good it cut well but it is the only thing I would replace.
It has a 134 or 140° angle, my preferred choice so I cannot be happier but it's the wrong bit for the application.
It has a very fine split point, very good if you have no pre-hole but there's no need for it as you are just over boring a most likely 6mm hole given the application.
I would use a 134° 135° 140° angle drill but without a split point as they're stronger and it's working on the very ends of the cutting edges removing little amount of material like 0.3mm.
And a drill bit has to remove about half of its diameter to work properly reducing the wear on the cutting edges and the chances of breakages because they tend to catch on the very little edge of the cutter ruining the bit.
About the brand, I didn't know it, never even heard about, but I've read they're around about 100 years and it's a German company.
For about 23 euro I'm more than happy with the purchase and honestly I didn't expect much.
It is a good product in my opinion.
Ps on yesterday once back to work after the lunch break.
Walking by the benches I've seen an M14 Heli-Coil installing tool.
I've picked it up to store it when I've read V-Coil stamped on it.
I've discovered we use them every day at work so I believe they can be pretty reliable.
Thanks for your attention, and my apologies if I drifted off thread by including little bit of surroundings about how an why I got this set
I've always known them as Heli-Coil years before I've started to work in a machine shop.
Anyways I've been in need of repair the damaged thread of the studs on my engine driven welder carburetor.
They were loosen and vibrations destroyed the threads.
I've firstly attempted to run a tap made new studs and used a bunch of thread locker .
It worked on 1 out of 2 because I've been able to cut deeper threads but on the other side they stripped very easily, no space to go up to M8 so the Heli-Coil was the only practical solution (impractical one was trying to weld it, drill and tap back to M6).
Anyways went on Amazon looking for thread repair sets and among all the Chinese metal cases set or the single size ones sold in blisters or even nylon bags I've had to choose between the original Heli-Coil and those V-Coil.
I've chosen them just because they are available I different sizes and pitches but especially because they were the only ones which included a small case.
After buying I've seen a video review about them and they held more psi than the original Heli-Coil.
Today they came in the mail and I've just finished using them.
They come in this little plastic box, very nice and compact, it has a spring loaded latch which keeps it closed.
I've found this little detail very nice.
That's the content, we have
A 6.3mm HSS bit
A 7.3x1 mm tap
35 maybe 6mm long coil inserts
The installing tool
And the punch to break the bent coil portion needed to drive the inserts through the threads.
After the first use I can say they are pretty good actually.
I love the build quality of the case maybe the downside of it are the various components locations that make hard to take the bit and the tap out as even my skinny fingers can't take them out easily.
The tap which should be just a manual tap as a part from the 3 flute construction it doesn't have any geometry which makes you think it can be a machine tap.
But it actually evacuated the chips just like a spiral tip tap.
This can be both bad or good upon the job.
I have to say it's a good one as it cut very easily self centering itself in the hole.
I'm very happy with it.
And one little feature I like the most is the centre on the square which helps a lot if used on a machine as you can use a live center for example to guide it straight.
Usually small taps don't have this little divot but a sharp pointed end.
The drill bit, it's just a ground and polished bit, no special coatings.
It looks good it cut well but it is the only thing I would replace.
It has a 134 or 140° angle, my preferred choice so I cannot be happier but it's the wrong bit for the application.
It has a very fine split point, very good if you have no pre-hole but there's no need for it as you are just over boring a most likely 6mm hole given the application.
I would use a 134° 135° 140° angle drill but without a split point as they're stronger and it's working on the very ends of the cutting edges removing little amount of material like 0.3mm.
And a drill bit has to remove about half of its diameter to work properly reducing the wear on the cutting edges and the chances of breakages because they tend to catch on the very little edge of the cutter ruining the bit.
About the brand, I didn't know it, never even heard about, but I've read they're around about 100 years and it's a German company.
For about 23 euro I'm more than happy with the purchase and honestly I didn't expect much.
It is a good product in my opinion.
Ps on yesterday once back to work after the lunch break.
Walking by the benches I've seen an M14 Heli-Coil installing tool.
I've picked it up to store it when I've read V-Coil stamped on it.
I've discovered we use them every day at work so I believe they can be pretty reliable.
Thanks for your attention, and my apologies if I drifted off thread by including little bit of surroundings about how an why I got this set
