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CR
2025-06-28 16:04:57
These particular types of bits are used for flattening surfaces when mounted in some kind of spindle - most typically for spoilboards mounted to CNC machines. The seller here claims that they can be used in pretty much every scenario up to including handheld routers. I am a little skeptical of that, but cannot speak to that purpose. Big bits in a handheld router are almost always a nonstarter for me! For flattening a spoil board they will work reasonably well. This is a task that is only periodically required when setting up a CNC, or replacing a sacrificial bed.Having options when it comes to the cutters is a nice thing. There are two bits in this set with half inch shanks: three and four flute bits, a collet extension, and a 1/4" collet adapter. I checked and the dimensions on each of the bits are correct for this use case. C2 carbide is good for this purpose as the material is a little less prone to chipping due to the slightly reduced brittleness though this comes at the cost of dulling somewhat more quickly. Is important that you understand the correct feed and speed for the bit you are using and the material you are cutting.The collet extension appears to be well machined - though I have not had a lot of luck using collet extensions in the past. The problem is that they inevitably induce an increased amount of wobble no matter how well they are machined. This is due to their nature and can only be minimized with a lot of trial and error. When used in a high-speed spindle (like a router) this can quickly become very problematic or dangerous. The best case scenario is that it just wears out your spindle bearings more quickly. The worst case scenario, well, can be a lot worse. If you do need to use the extension, you will need to work at finding the setup that results in the least amount of vibration. Because the included bits are fairly large in diameter, if you are using this in a handheld router, it absolutely must have a variable speed option, and should be set to a low RPM. (And done at your own risk...) For use in a CNC spindle, follow the manufacturer's recommendations. It should be obvious that these bits cannot be used in a plunge type setup. (There aren't any cutting surfaces in the center.) Also, use dust collection or a respirator!I think these are a reasonable value that deliver the functionality.l I am after. They are useful for flattening a surface but must be used with the suitable amount of caution. I don't know that I will ever use them in a router or use the collet extension though it is a nice inclusion if I ever need it. Good luck and be safe, friends!
James Richters
2025-04-07 10:36:30
I got these for a CNC router, primarily for cutting 3D miters with a 3D toolpath. The larger diameter your router bit is, the further you can step over without creating scallops, which means faster run times and smoother results from my 3D toolpaths. I do rough out the 3D miters with a hogger router bit first, and then I'm using this bit for a finishing operation. I run this at 10,000RPM on my HSD spindle and it runs nice and smooth, no detectable vibration at all. The diameter is also very accurate, as accurate as I can measure with a caliper, and certainly good enough for woodworking. My 3D miters come out very smooth with undetectable scallops and without an excessive amount of 3D passes, thanks to the 2" diameter.I am very happy with the quality of these router bits, and they are really working well for me.These come with an extension and the collet in the extension is VERY Thin, I just don't think I can trust it in my machine. The smallest collet I would ever think of putting one of these in is an ER20, which is quite a bit more substantial than this skinny collet in this extension. I think such a small collet could be useful if you needed to do an undercut and needed to get right up close to something, but other than that specific case, which I'm not sure I'll ever encounter, I'm going to stick with either ER20 or ER32 Collets for a 2" diameter bit.Unfortunately, the extension is bringing down the rating on this, because I have to rate the entire set. If they just didn't include the extension at all, I would easily give the router bits 5 Stars because they are well made, and accurate, and balanced, but the extension is just not something I would even want to put into my very expensive HSD spindle.
Bob_Sunshine
2025-03-25 12:01:43
I am not quite sure why someone would want both 3 and 4 flute spoil board bits of the same diameter. They do almost entirely the same thing. I used the 4 flute bit to flatten a board. It worked ok. The bit seem to be about average quality for economy level bits. The price, two for $22 is decent.The set also comes with a collet extension allowing you to safely add about 2 more inches to the shaft length. That can be used in setups like a router sled for flattening large slabs. We do not all have large CNC machines! This extension appears to be very well made. I expect to use it with some bowl bits. There is also an adapter for 1/4 inch shafts.I am puzzled by the product description suggesting ways that, in my humble opinion, seem inappropriate or even dangerous. They are not flush trim bits. I would not use them for making dados with the outer diameter of the bit forming the bottom of the dado. Why would you do that rather than using a spiral or straight bit with the end of the bit at the bottom of the dado?
Tadzio
2025-02-04 19:16:11
I've used these router bits to cut rabbets in the edges of boards or plywood for cabinetry, using my router table. They cut clean with no visible tear out. I always prefer 1/2" shank bits, so these are great. After using them for a few projects, they're still cutting cleanly with no detectable wear. They do exactly what they're designed for and they do it well. No wobble or chatter that I could see. Good value for the money, I'd say, and 5 stars from me.
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