Shop Fox D3347 Cam Clamp

I bought these clamps after battling to find a low profile reliable clamp that would work on my CNC table which has t tracks and a 3/4 inch spoil board. I had to purchase longer bolts with allen key heads to accommodate the thickness of the spoil board. My tracks are set up every twelve inches on a 48" table. They work flawlessly. I do production sign work and the clamping process has become part of the process. No more fighting to adjust clamps, or smacking into them with the carving bits! (not a pretty sight!) Their low profile, at least for my work, insures nothing is in the way when I run my jobs. No issues regardless of size of material. I use a block between the clamp and my workpiece which eliminates any marring of the finished product by the clamp bite. I keep my allen wrench in a tool slot with my bits in close proximity to the table. Have produced hundreds of signs, and have not had one slip yet regardless of size. The nice thing about these clamps is they bite down as well as in which can be used to force a slightly bowed or skewered piece into laying flat. For those who use CNC's and V carve you know how important that is. Best of all, thanks to the little allen key slot holder I built. I have never lost the allen key! As far as the finish and tolerance of the product goes, I purchased four at different times. All work perfectly. I have found the best way to use these is to snug up to block, tighten securely and turn the cam lever. Works every time.

I've now used these clamps for a few projects, and I've decided that I very much like them for the convenience they add to my workflow. However, their manufacturing tolerances are bad. I ordered four clamps. One of them had a center pivot that was too short, so if you tightened the clamp to the T-track, it clamped down on the cam, rendering it inoperative. I popped the screw and center part out, added a washer to add clearance, and the clamp works perfectly now. Also, the end of the jaw springs poke out below the base of the clamps, which is slightly annoying and made even more so by the extremely short screws. So, I replaced the screws with longer 1/4"-20 socket head cap screws, replaced the so-called T-track nuts with "real" ones from my stock of T-track nuts, and added washers as necessary to create clearances where poor manufacturing had not, and in spite of all that, I rather love these clamps. Basically, I highly recommend these clamps, but consider them "part sets" that require screws, nuts, and washers for assembly (those three not included).

These style clamps are great for my CNC routers. I have purchased at least 8 of these clamps previously and all have been good quality. Unfortunately the last 2 clamps purchased were terrible quality; clamp moved at angle, casting not smooth where needed, internal fit very bad. All in all I have been satisfied with this brand of clamp and I will order again but with the mindset I may have to return due to poor quality as with these last 2. Good luck and happy clamping!

I am most impressed with the flexibility in holding work down and flat on my CNC, along with the low height of the clamps. Only used six times so far with 3/4" thick or thicker solid wood. The low height is much easier than making sure overhead clamps don't get hit by the cutting tool. I flattened a live edge slab which would have been difficult without these. One issue I had was that the allen screws were the wrong (too short) length for my tracks and spoil board. Luckily the local hardware store sells them in 1/8" increments. Maybe after surfacing over times I will need the shorter ones. Suggestion to Shop Fox - Since you don't need a cam on all 4 sides, why not make flat or round "stops" without cam action for a reduced price to compliment these?

I bought four of these to use for securing large pcs. of stock to the bed of my mill. I was looking for a low-profile clamp that would allow me to machine the entire surface of larger parts without interfering with the tool in the spindle. While they work well enough, often I'd have to use an Allen wrench in conjunction with the clamp lever as the bushing inside the clamp bottoms out on the mill table prohibiting you tightening the clamp completely. My guess is they were machined incorrectly at the factory. Overall fit and finish is good, but the clamps are a little small for what I'm doing. I'll be making my own clamps from now on.

The cam feature makes a tight grab. To avoid damage to my wood I use a steel bar to distribute the pressure. I use in conjunction with the spinney vise to adjust the distance and this makes easy to batch out several of the same board size and hold it secure. Just flip the lever to lock and flip back to release.

I bought two of these from Amazon to use with a Rockler Shark Pro Plus CNC router. There is a problem: The clamp plate is too thick to slide into the Rockler Multi-track. The solution is to use rectangular nuts that are less than 1/8" thick. I've bought them from Rockler in the past, but they apparently no longer stock them. These look like they will work: Woodpeckers 13M010 Woodcraft 147922 (Lee Valley track nuts are too large.) The clamps are very strong. If you are using one to clamp wood, you probably want to provide a little excess material so you can cut off the dents that the clamp makes.

Ideal for use with CNC routers due to superb holding power as the jaws tip downwards as you tighten. For jobs clamping a finished surface just place a small piece of sheet steel or plywood in front of the jaw. Shipping to Australia by Amazon is simply amazingingly fast and cheap and the best value one can get. It is cheaper that shipping in Australia! Wonderful stuff Amazon!

The bolts which attach to the t track are too short. Need a bit longer bolts

Cheap and crap

I made a removal table for my Portaband. I used this as a quick release lock. Works good. The screws in the picture were just temporary. I swapped them out for counter sunk/flush screws.

Poorly and cheaply constructed falls apart when turned on its side. Does not fit into tracks for a CNC machine. Money wasted on the purchase of 4.

Poor build quality. I would not recommend.