Just posting some more pictures of the build. The following pics show the Lower Torsion Box assembly. I also show how I attached the ends to the Torsion Box. I decided to bolt them on for now. I will likely glue and bolt them on later.The Torsion Box was just assembled with wood glue and staples. Let me know if you have any questions in the comments.
Lots on the forum are tapping the mdf and using screws, I decided to go with Conformant Screws. I’ve used these on other projects involving MDF and the work really well. You just need to make sure you drill the holes straight.
I’ll be posting a bill of materials, but for those that are interested I started this project with a 4×8 sheet of 1/2 MDF from local Menards as well as 4×8 sheet of 3/4 MDF (about $35 total). After cutting the parts, I have plenty left over for testing the machine. As others have suggested on the CNC Zone, I made the adjustment blocks out of cutting board material.
I found a great deal on scrap material from The Cutting Board Factory’s Specials Page. This was a great site and they delivered exactly what I needed with lots to spare for about $20.
Cutting the MDF was pretty easy. Just took my time and carefuly cut all of the pieces in the plan with a table saw. Having a table saw makes this a pretty quick process, but the great thing about this plan is it can easily be done with a few clamps, good straight edge, and a circular saw.
I also cut the HDPE (Cutting board) material on the table saw as well. To make the Adjustment blocks I carefully measured, marked, and center punched all of the holes. In retrospect this was wasted work as eventually I just went to my Dad’s house and used his Drill Press. Having a drill press makes this really easy as you can setup the fence so that you can just slide the part in and drill all the repetitive holes quickly. If you don’t have access to a drill press, I suggest you carefully measure and center punch the holes so you drill doesn’t wander much.
According to the plans I tapped all of the Adjustment holes with a tap and die set that I bought at the local Harbor Freight. This was a really inexpensive kit and it has paid for itself the very first use. I was able to buy all the bolts and nuts at my local Menards, but also considered buying them at Bolt Depot.
I’ve been studying this for quite some time, but I’ve finally decided to build my own CNC Router. It combines many of my hobbies; Woodworking, Computers, and Electronics. It is by far the geekiest thing that I have ever done.
My thanks go to all the kind folks at The CNC Zone. I’ve been lurking there for months now, and information there has given me the confidence to go forward. I’ll be building the JGRO machine.