LUNYEE 4PCS Mini Hold Down Clamp Kit, CNC Router Clamp for Woodworking and Metalworking, Compatible with 3018 CNC Router Machine, 3018 Pro Max/ 3018-Pro Ultra, 2.5’’Lx 0.8’’Wx 2.4’’H

Lo utilizé para agarrar pizas en una cnc

I built a nice-sized desktop CNC machine last year but I was using some lousy holders that I got with an older CNC that had since died, and wanted to try out these ones for the pivot feature.These are really nice and perfect for my needs. I did swap the bolt out for a 1/4-20 version to fit my existing set-up, and that took all of a minute to do and didn't affect the way that the hold-downs worked at all. The spring and the pivot were such a massive improvement over the plastic ones I was using before, with no slippage at all like I was having with the other ones. The pivot feature is also great because it makes clamping down materials of different thicknesses even easier.I definitely recommend these well-made and durable metal clamps to anyone who is using a CNC on any sort of regular basis.

I'm using these on my drill press table. The t-track nuts were a little wide for the track on my table. This was easy enough to fix with a file, and won't be a problem with standard size track. The clamps have a pretty large adjustment range and securely hold down work pieces. Much safer than holding things down by hand.

I made a mistake by not looking carefully at the t-nuts on these clamps for ordering them. They are not designed for the 3/4 x 3/8-inch t-slots that are standard on many woodworking tools. Thankfully, I had an unused miter bar with the appropriate M6 threaded holes that allowed me to create a hold-down jig down for my table saw and router table. The clamps themselves are machined well, with nice finish quality, and were designed in a way that they can be taken apart easily and arranged for different uses.

Much better than using janky bolts and bits of threaded metal. Much faster to put on and take off and don't get in the way of the cutter head as much.

I’m no engineer but the washers these clamps came with are super thin and bend under the slightest pressure. (See pics) I was about to send them back but love the low profile so I decided to replace both upper and lower washers and now they work amazingly. Sad, such an easy and cheap fix could take these clamps from “meh” to AMAZING. I expect compensation from this company for enhancing their product for 1-2 cents per clamp. 😂 royalties for the next 5 years.

I ordered the clamps anyway as I have lots of other equipment that uses t-tracks.And while they will work on anything that uses a track system, I purposely got them for my drill press table.These clamps use M6 x 1.0mm thread and t-nuts to hold the clamp to the work surface. The pivot points are adjustable, and they have a spring-loaded mechanism to assist when releasing the pressure on the clamp.I like the springs, and I don’t have springs on my other clamps but will probably add them after using these clamps.Note: The washer that is supplied between the spring and the clamp base is very small and jams easily. I recommend changing the washer under the clamp to a little larger size so that it doesn’t get “tangled up” with the spring (see picture)One important consideration for these clamps is that universal t-track are 3/4" wide x 3 /8" high (see picture). This clamp will NOT fit in that track as is. The in-track piece is a little bit too tall to go inside the track. The easy solution is to replace the slide piece with a smaller slide or a nut that will fit the T-track(s) that you have. The nuts that generally fit are 12mm (~7/16. OR you could just get some hold down clamps that fit a standard track system ;-)To summarize, for my purposes these worked fine in conjunction with other hold down clamps I have.A well-made product at a reasonable price and a repeat purchase for me.Loses a star due to the non-standard slide and washer modification needed to improve performance.

Actually was pretty impressed with these clamps. The pivot point is a smart feature that I haven't seen before on more expensive clamps, and they have multiple positions for taller objects. Also swaps out easily to 1/4-20" hardware for US T-Track extrusion, if you have the hardware.