I am never short on things to fill my time with and typically I need to implement time management strategies in order to accomplish the things that I consider to be important. One of the things that suffer is the time spent on the internet looking at other cool projects people are doing. There is soooo much stuff out there that people are doing that it actually frustrates me because it inspires new ideas, and projects, that I do not have the time to take on. I am always intrigued by the blogs, and sites, that show close up photos of the actual work that is being performed and not just the finished projects. I feel as though, over time, my blog has lacked the visuals that provide the raw metal and tools. This posting I wish to get back into, what I consider, to be the passion.
For those who need an update on what is going on in the garage these days I am building a plasma torch CNC table. Check out my previous posts to get up to speed if required. This blog entry is going to deal with the Z axis. As stated previously I am building the table “backwards” and starting from the tip of the torch.
The Z axis dose have some requirements. In my case I am designing a floating torch head. For those not familiar with this style I will briefly explain. In order for the CNC software to know the vertical position of the torch head the Z axis stepper motor needs to run the torch head down until it touches metal. There are numerous ways for the software to know when the touch occurs. In my case the torch is designed to touch the work piece and then it will start to float on the Z axis. In other words the torch head stops moving once it touches metal however the Z axis continues to travel downwards until a mechanical switch is triggered. Once this switch is triggered the software can then back the Z axis upwards to a pre-programmed dimension which will set the torch head at the proper starting height. The reason for the floating design is to prevent any damaged that may occur to the torch head while being set onto the work piece. Stepper motors have enough force to start breaking components of the table and torch. By only floating the head the weight the torch head, and support plate, is being exposed to the torch itself.
I did AutoCAD some basic starting points in order to machine my main support plate. After the initial fabrication of the plate took place I started to just wing it all. The following pictures show the process I used to create a mocked up version of my Z axis. Pleased to say I hooked it up to the power supply and PC and was able to run it through its vertical motions will no issues. So at this point the Z axis is tested and working. There is still much “clean up” to do on the parts including trimming of excess aluminum. I will do this at finishing stage.
The way I post most of my pictures, for other blog entries, is in sequential order. I start from the beginning of the project and finish at the end. I changed things slightly this time. Since there are multiple smaller parts that make up the entire Z axis I tried to start certain sections with the finished part. I am hoping that it may help those, who are interested, in following along with the pictures a little better. There are 43 pictures posted in this one, most of them machining shots. If you don’t understand what’s going on I encourage you to take comfort in the visuals of 6061 aluminum, spinning tools, and flying chips.