Frequently Asked Questions
Is there a digital version of the books available?
There is a digital version of Build a Pulse EDM Machine: The Next Generation, but not for The EDM How-To Book.
Are complete EDM kits available?
Not at the present time; only books and unpopulated PCBs. See our Products page for a list of available products.
Are these standalone EDMs?
The unit, as described in The EDM How-To Book, is designed to attach to a drill press or milling machine. The unit, as described in the Build a Pulse EDM, is a standalone EDM—though it may be built as an attachment to a drill press or mill.
Are Printed Circuit Boards (PCBs) available?
Yes, unpopulated (also called non-stuffed) boards are available for both the RC and Pulse EDM. See the Products page for additional information on purchasing.
Are there plans for a Wire EDM?
There are no concrete plans, but we are looking into the possibility of building a wire EDM system.
Will either of the power supplies work for a Wire EDM?
We haven’t tested the use of our power supplies with a Wire EDM system.
What is the cost to build the electronics of each EDM?
It depends on your junk box and ability to scrounge for parts. However, if purchasing everything new, the Pulse system is about 3x more expensive than the RC machine. A large part the expense are the transformers and power resistors.
Is there a Bill of Materials (BOM)?
There is a Bill of Materials in each book, but the suppliers’ part numbers may not be current. This is one of the most frustrating parts about supplying plans; suppliers are constantly dropping items and or substituting and changing part numbers. For individuals that purchase a PCB, we do our best to keep the supplied BOM as current as possible.
What voltage are the power supplies designed to operate on?
Both supplies are designed to use 110-120 VAC, which is standard for the U.S. There are many builders in the UK and Australia, as well as other parts of the world (more than half of our sales are outside the U.S.) that have successfully built working EDMs by using a transformer to step down the voltage.
How much machine work is required?
For the RC design, minimal machine work is required (mainly a lathe to machine the lead screw) if built as per the book. The lack of machine work limits the accuracy and capabilities of the mechanical aspect of the machine.
The Pulse machine, if built according to the book, requires the use of a Mill (primary) and a little lathe work.
What electrodes are used?
Primary EDM grade graphite such as sold by Poco. Low density carbon rods are not acceptable. As far as metallic electrodes, copper is most frequently used and brass can be used, but expect high wear in most cases.
Where can I purchase electrode material?
We suggest utilizing online auctioning sites for good deals on electrode material. Many companies sell “drops” or even entire used electrodes. For the hobbyists, this material is usually very high quality and more than enough for your projects. Otherwise, we recommend looking at companies like Poco for material.
What dielectric is used?
Any VERY thin hydrocarbon oil may be used, with kerosene probably being the most common. Diesel fuel is too thick and does not make a good dielectric. Commercial EDM dielectric oils are not much more expensive than a good grade of low odor kerosene. We would recommend its use if possible. We have found that WD-40 also makes a good dielectric, but it turns dark, and particulate matter doesn’t settle quickly.
Is the design in the book and PCB the same?
No, individuals that purchase a PCB (whether in a starter kit or by itself) receive the most current design and bill of materials. The designs in both books work well, but over time we have made improvements to the designs of both PCBs. While the information provided in the book is still relevant, if you purchase a PCB, follow the instructions you receive with the board, NOT what is in the book.
I am not familiar with EDM terms and lingo; do you have a list of common terms?
There is a Glossary of terms found in each book.
Are there any commercial publications related to EDM work?
Yes, there is a free EDM publications called the EDM TODAY magazine that occasionally has information and tips that would apply to the EDM hobbyist.