DMM Servos

Need advanced servo motors or drives for an upcoming project?  Building a CNC machine?  Just interested in learning a lot?



My experiences with their service has been outstanding.  Will be receiving product soon and have to post more about that then., a company that:

DMM Technology Corp. is devoted to the research and development of advanced servo motion control products. Within our 20 year history, we have achieved numerous patented technological advances in the automation industry and have integrated these technologies into our products. These achievements have allowed us to expand the limits of AC Servo application and have attributed our products with an unprecedented combination of performance, reliability, and cost.

All technology used in our products are developed by our in house engineers who utilize smart thinking and smart solutions to simplify the servo control mechanism while maintaining a high performance and full-featured product.

Our products have proven themselves in many manufacturing, and automation industries for worldwide applications. We are also able to collaborate with users to develop new, or modify existing systems in order to meet and exceed the target requirements. We integrate smart technology into an industry proven package.

Visit our Core Technology section to learn more about our technical specialty.


One-Off Cast Iron

I had an incredible talk with Craft Pattern today, about making a custom cast iron machine frame.

They really took the time to talk me through the process and helped me understand the different techniques used.

Isn’t it great when you get to talk to someone who knows what they are talking about?

Have you considered cast iron as a possibility on any of your projects?  I hadn’t until recently, but now a whole new world of possibility has opened up.

In addition to casting, they offer full CNC machining services on the castings, so it sounds like a one-stop-shop.




A new part for an old Bentley restoration

At Sinking Valley Woodworks, we take on odd jobs from time to time.  One of these odd jobs was some car parts for an old Bentley restoration.  Wood was a much more common material in cars in that era.

This particular piece is what goes at the top of the windshield and connects to the roof.  It has curves on all faces, and compound curves on most.  The new part was made out of Ash, carved on a CNC router, and finished by hand.

Below is some before and after pictures.20151002_141251 bentley part


Making a Candle Holder with the CAMaster Cobra CNC Router

I have been rather impressed with the accuracy of our CAMAster Cobra 508 ATC CNC Router.  Here is a picture of a similar machine:


For having a travel of over 5′ x 8′, it still handles the fine details with quite a bit of repeatable accuracy.  I helped to make a candle holder out of a piece of curly oak.  It turned out to be very pretty.

In the following picture, you can see 4 toolpaths.   The large circular pocket (0.25″ deep), the small inner pocket, the radius around the edge of the circle, and the engraving.


The rest of the project was completed using a bandsaw and conventional tools.  CNC brings a lot to the table (pun intended), but it is more amazing what a craftsman can do by hand.

Did you know that Okuma, who is a manufacturer of state of the art CNC machines, hand scrapes all the seven components of a machine foundation?


Unfortunately, there is still no technology available to achieve the geometric precision that hand scraping does. Components need to be aligned within a millionth of an inch. And it’s where that kind of precision is needed that makes it even more critical: your machine’s foundation. The seven components of a machine’s foundation simply must be hand scraped to create ideal flatness, to develop proper oil pockets, and to achieve those tight tolerances.

In the world of CNC routers, we talk in “thousandths of an inch”.  But in the above, they are talking in “millionths of an inch” and “by hand” in the same paragraph.  That is simply amazing to me.

Here are some pictures of the finished product.  The sum of some  of the efforts of man, machine, and nature.