Category Archives: CNC - Page 16

Some CNC Router Machining Failures

Lest you think that everything always goes correctly in my garage when using a CNC router, here’s a couple parts that I spectacularly ruined recently. Although I was disappointed with these cuts, they really don’t compare with smoking a brand new Dremel 4000!  So here are my latest epic CNC failures:

Routing (Melting) Delrin:

Delrin is a great material for industrial applications.  Although it’s not hard at all, it’s wear resistance is extremely high.  Unfortunately, I didn’t realize that it melts quite easily when machining.  This was undoubtedly compounded by the fact that I was cutting deep into the material, and the chips weren’t cleared, so there wasn’t much in the way of convective cooling.  After close to an hour of fairly cautious cutting, everything on the bottom was melted, and the piece was pretty useless.

I’d recommend making sure the chips don’t stay on the bottom to be melted, and using some sort of coolant would probably help as well.  Here’s a thread on practicalmachinist with some advice on this subject.

Multiple CD Ninja-Stars:

CD melted together when machiningIf one CD cut into a ninja star is good, certainly three would be even better.  Keyence, which makes excellent scanners that I use at work, seems to be sending me their program CD with every sensor I buy, reminiscent of early 90’s AOL.  As with AOL, I decided to “recycle” these disks into something useful.  Sure I can’t put a copy of Scorched Earth on a written CD like with 3 1/2 inch floppies, but I do have Read more »

CNC Light Painting: Vast Improvement Using a Remote Trigger

Up until now, my light paintings have been shaky or very small.  That all changed when I bought a remote trigger from Amazon (for around $5 with shipping!).  I’ll give more information about this little device on this in another post, but for now, here are my results:

CNC light painting "JCOPRO.NET'jCOPRO.NET logo, of course this had to be first.  As you can see, there is a shadow behind it that I plan on minimizing by either some shrink wrap around the LED, or maybe some a black background around the light.  Either way, there is still some room for improvement.  The second one, is a Clemson Tigers logo:

"Go Tigers" light painted logo

I was quite happy with how the paw details turned out considering my “Y-axis” canvas was only 2″ high (see my other posts for a better explanation).  The third CNC light painting was from a video game that anyone should recognize, Read more »

A “Video Review” of the Zen Toolworks 7×7 CNC Router

Recently Xin (the owner of Zen Toolworks) asked me to post a short video review of their 7×7 router on  I was happy to oblige, and here is the video:

Although this isn’t strictly a review, Read more »