Up Down Compression Spiral Flush Trim Router Bit, 1/4 Inch Shank Solid Carbide Flush Trim Router Bits CNC Spiral Bit with Nano Coating by EANOSIC

A spiral flush-trim bit such as this is a somewhat newish design that combines features and benefits of both upcut bits and downcut bits. And flush trim means that this bit is designed to follow a pattern along its bearing, to allow the material above the pattern to be cut flush to that pattern. You don’t want to ask a bit such as this to hog off much material; it’s forte is trimming small amounts smoothly even with sheet goods and areas of changing grain direction. So use your saw to cut close to the line, and this bit to just make that last 1/16” tight to the line and smooth. I can’t say that I have past experience with this company, but this bit does a nice job for a very good price and I would buy one of these again. I’ll update this if the bit seems to not hold up well! I hope this review has been helpful to you!

I took this little bit out for a spin and was very happy with the results. The pictures are with a piece of 1/2” plywood. I grabbed another piece to use below it to test out the bearing portion of the bit as well, but didn’t look to see that the edge was rough, hence the less than straight cut. This bit left a splinter free cut on both sides of the plywood. It cut quickly through the 1/8” of material I was trimming off. Just keep a few things in mind. This is only a 1/4” bit. Take it easy or you’ll probably snap it. The part of the bit that makes the clean upward cuts (just above the bearing) is small. As in about a 1/4”. You have to have the bit depth adjusted correctly so that the bottom of you board is inside that cutting area or else you’ll be using the downcut portion of the bit and probably get splintering.

I have a 1/2 up cut flush trim bit but need something smaller for a tight inside corner. I expected this bit to produce about the same quality cut as my bigger, premium bit. This bit cuts better! The up/down compression really eliminates tear out on both the top and the bottom of the work piece. While I have not used this bit enough to rate its durability, I will be grabbing this before my other bit next time I need to flush trim a piece.

This seems like a decent flush trim bit. The compression pattern does a decent job of making a tear-out-free cut on both the top and bottom of your workpiece. My main complaint with this is that the bearing seems a bit undersized, so if you have the cutting edge overlapping your template at all, it will cut a bit into the template, and it also leaves your workpiece ever-so-slightly undersized. Its only a slight annoyance, but its one I havent had with name brand (i.e. whiteside) router bits.

Sharp and leave a good top and bottom finish. I have had no problems with bits from this company. easy to use.

Having once snapped a premium 3/8 inch spiral on its second use, I’ve managed to suppress any interest in a long, tiny 1/4 inch one. The opportunity to test one through the Vine program overcame a couple of decades of reluctance, and, with less than an hours use, trepidation has transformed to enthusiasm. This is one useful bit. Not surprisingly, it allows me to enter smaller spaces for interior cuts, and to follow more finely detailed templates for external cuts than I could ever hope to achieve with a larger bit. The up/ down spiral does indeed leave a far smoother finish—top, bottom, and in between—than I can achieve with my straight bits. I have used it only for light, slow cuts with the same knowledge “Amazon Customer” shared in his/her January 9th review, which I recommend reading. As others, I still worry the 1/4 bearing is going to hold up. I wish they had included 3-4 replacements with the bit. Time will tell if my concern is warranted, but over that time I’ll be checking often to ensure the bearing rotates smoothly.. I won’t be using this bit often, so it may be some time before I can report on actual bearing life. For now, I can only affirm others in their praise for this bit. It is well worth its modest price,

It cut 3/4” plywood like it was butter. Make sure the guide board is secure and long enough and dont try to handle it without one. If the wood is hard, the router will pull away from you and slice quickly into places you dont want to cut. I made that mistake trying to finish the last inch to the corner of the work table I was trying to give a straighter edge. Instead it pulled itself out of my control just long enough to make a deep gouge before I could pull it away. I just didnt expect it to cut so well. But the reason I tried it first on that was because I didnt really care much about damage, since its just a work surface that will get beat up anyway, so no big deal and it kept me from making that mistake on the shelves I was making. Not sure about how long it will last, but at least new its pretty good for the price.

I used this bit for the first time to clean up the edges of a CNC carving. I purposely cut too shallow with the CNC into a piece of walnut, then cut the carving out with a jab saw. This to me provided the worst possible scenario I could come up with regarding the wood. Hard wood with jagged overhangs that have been stressed already, and a curved edge. As for the router, I used a cordless handheld DeWalt 1/4 in router. Its large in the hand so kinda hard to hold and it is easier to accidentally tilt than a larger router. Then I flushed the corners holding the router in one hand and the carving in the other. This was the worst possible scenario I was willing to tolerate. I got the best results I have ever gotten from any flush trim bit - with the worst conditions I could come up with. There was zero tearout, and perfect alignment. Look at the pictures, they speak for themselves. I hate to write gushing reviews, but this is a standout tool that radically outperforms every other version of the tool I have ever used. Cant recommend this bit highly enough.

The 1/4-inch Up Down Compression Spiral Flush Trim Router Bit performed well in my testing. The bit cuts fast and leaves a smooth surface. I tested the bit with 7/8-inch-thick air-dried Cherry wood. The bit performed as described.

I have a couple of bits from this company, and I’m impressed with the quality. This particular 1/4” bottom bearing flush cut bit is a useful size for following tight patterns or for trimming flush to another piece. You do need to make sure your pattern is accurate and smooth as any imperfections will show, given the small bearing diameter. I’d consider this a tool for precision work, rather than hogging out the edges of countertops- solid carbide is not for forcing, and the 1/4” diameter means you need to take it slow. If you have never experienced the improved quality of cut from a good spiral ground router bit, you should give this a try.