my Multicam CNC is for sale!

Multican CNC

I got a deal on a larger machine, so my current machine (pictured above) is now for sale for a great price, because I need to get it out of here to make way for the machine I just bought.

It’s a heavy, fast machine which works well. In the above picture you can see I just cut some 3/16″ aluminum, and it does a great job on quarter inch as well. Nice, smooth cuts on acrylic up to an inch thick. This is the machine I started my business with. You could use it to start yours!

Table size is 50 inches square, and the maximum thickness that will fit under the gantry is about 6.5 inches. Weight is 3500 Lbs. It’s a bit of an effort, but I can move it by myself on a pallet jack or dolly.

You’ll note that it has a Colombo spindle, rather than a router. Capacity is 4HP.

It has servo motors on all three axes, and all the wiring is original. It comes with wiring diagrams and the ancient Dell which serves up files to it. Uses standard g-code.

Comes with 5HP Becker oil sealed vacuum pump, which pull 28″ of vacuum. This is a lot more than a shop vac.

It does require 480 volt 3 phase power, so if you want to run it in a garage, you’ll have to do a little research on phase converters.

The price is $6000. Current location is in Minneapolis. If you want it crated for shipment we can probably work something out.

If you’re interested you can email me at robocutcncrouter@gmail.com.

 

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boat electrical box 004

David Heiserrer, of Jiggernaut  fame is renovating a sailboat, and part of the renovation involves some new  electrical doodads, so he emailed me a file and dropped off the electrical box you see in the picture above, except it had none of those holes in it.

How to mount such a thing on the table for cutting? The four mounting holes on the back with threaded inserts looked like a good bet. It turned out to be a standard polycarbonate enclosure from Hoffman, so a datasheet showing the spacing of the mounting hole spacing was pretty easy to turn up.

boat electrical box 001

It was the perfect opportunity to do something useful with an oil-stained piece of half inch MDF that was sitting around. I quickly programmed and drilled the rather oddly spaced hole pattern and mounted the board to the back of the enclosure using flathead screws, then mounted the board to the machine.

boat electrical box 003

 

Experience has shown that an unsupported piece of plastic like the door (where I needed to do the cutting) will vibrate like a drumhead, so I also cut another piece of half inch MDF to fit inside the door to back it up and attached it with double sided tape.

David’s original design had round holes for all the components, but he brought samples. A little quick googling turned up datasheets for all of them, so I fine tuned the dimensions and added anti rotation features.

boat electrical box 005

 

 

David now has a very high quality electrical box with parts that will remain neatly aligned. It doesn’t matter whether I have to think inside the box, outside the box, or both, my focus is always on creative solutions to my customers problems!

I cut the letters, Sean did the rest

Forgot to take pictures of these sign letters while they were being cut, but here they are assembled to the steel backing. The material was 3/4″ Extira, a variety of MDF (medium density fiberboard) with outstanding weather resistance, which is also used for exterior architectural trim and moldings.

The picture above shows the twin of the sign in the first picture in place and mounted to the building. The design, assembly, and mounting were done by the very capable Sean Doyle.  He also cut the delicate tree design on the corner of the building, which is visible above his left shoulder by hand with an oxyacetylene torch. The rest of us can only dream  of having such well developed fine motor skills.

fun with HDPE

Interesting little parts made from HDPE. I probably shouldn’t tell what they’re for yet. This started out as a DXF file from an ancient version of Adobe Illustrator which was emailed and imported just fine.

A quick wave of the heat gets rid of a lot of the scuffing and scratching on the original surface of the sheet, much like flame polishing acrylic. The rounded over edges are easily done on the CNC router.

I wound up running these in 12″ by 24″ sheets that yielded 48 parts per sheet.

deep foam

Prototype foam parts. About 5 inches deep at the lowest point. Coffee cup shows scale. This is a test cut made in cheap one-pound foam from the lumberyard. The yellow lines are where the two-inch sheets were glued up with urethane foam.

Here it is flipped over after cutting the bottom side.

And here is the finished part, cut free from the frame.

Reuleaux triangle

If you think this looks like just another useless desk, toy, you are sooo wrong! It’s actually a sample to demonstrate  my plastic cutting capabilities. I was perusing Thingiverse looking for inspiration, and found this version, which at number 1082 appears to be a pretty early thing.

I liked the Reuleaux triangle because it incorporates some interesting geometrical concepts. Here’s a diagram to illustrate:

It just so happens that this shape rolls around nicely inside an appropriately sized square, as the following animated gif illustrates:

It’s a  principle which has actually been utilized to drill square holes. Click here to see the Wikipedia entry. Reuleaux, in spite of his French-sounding name, was actually a German engineer who did pioneering work in kinematics.

Here’s one last macro shot of my sample, showing the chamfer cut on the recesses where the nuts fit:

The nuts which fit in these recesses are 10-24 thread size, and are 3/8 of an inch across. Those toolmarks on the bottom are from an eighth inch diameter bit.

The plan is to put promotional engraving on these, check back for examples!