Monday, February 19, 2018

Thursday, February 15, 2018

After a few tweaks, the DIY CNC is back online!


In the past few weeks I've been working on a new CNC instructable, but I was having trouble getting my motor drivers to cooperate. At first I couldn't seem to get them all to even start up. I decided to try out these Texas Instruments DRV8825-based Stepper Motor Driver Module designed as a drop-in replacement of my existing drivers:

I was getting better results but still missing some steps so I checked the 3.3V from my modified phone charger. It was showing the expected voltage on the multimeter, but when I looked with my $20 single-channel oscilloscope, I saw frequent peaks above 9V.
I added an electrolytic capacitor I found and smoothed out the peaks to around 3.6V. That's it, right? Wrong! It took a few more trial runs and a night to sleep on it to realize I also had a mechanical binding issue on the x-axis. After removing 2 screws, it's working great again.

Monday, January 8, 2018

Corner Bench Featured on Woodcraft.com

Thanks to Woodcraft for featuring winners of the instructables.com Furniture Contest: https://www.woodcraft.com/blog_entries/chicago-maker-wins-furniture-contest
You'll find mine among the second prize winners.

Here's a photo of the table we bought from friends and painted to match...

Tuesday, November 21, 2017

Corner Bench Entry in the Furniture Contest at Instructables.com

Sorry, it has been far too long between posts.  I started a new job and neglected my hobby for a while.  Now I'm finally posting a new i'ble on the corner bench I installed in our dining room: click here.