Here’s a cool idea. Suppose you had to make one of these:
Lots of little cooling holes in the electrical chassis panel…
Sticking in the CNC mill and doing lots of drilling and milling is the first thought that comes to most of our minds. And that’s not a bad idea at all. But a piece like this would be much faster to do on a punch press. You’re going to tie up that expensive mill on the mundane task of drilling tons of holes. It might or might not be profitable and having a much cheaper machine do it might be a better answer. But it’s still daunting–you wouldn’t want to do it manually, and you probably don’t have a CNC Punch Press in the shop unless you do a lot of that kind of work.
Enter this cute little CNC Punch Press made by a member of the Detroit club (can’t find who) and exhibited at NAMES 2003:
Shopmade CNC Punch Press…
Take a little manual punch press and make a “table” for it that is driven by stepper motors and Mach 3 and you have just the tool for the job. Here’s another shot of it:
There’s also a little thread on CNCZone talking about these things. For a while, a company called Aircastle was making one that looked like it might have been the same guy as made the one I show here. It’s no longer listed on their site, though they shoot a neat custom Box Maker that has a cool Conversational CNC interface aimed at custom boxes.
If you were doing a lot of sheetmetal chassis work, a machine like this might be a slick way to get into that business. You’d ultimately buy a more capable machine, but you might get a fair bit done with something like this. My brother works for a company that spends quite a lot of time on their CNC Routers cutting out cardboard for custom boxes. They could probably do with a purpose-built box machine like Aircastle offers too.
I have known a couple of shops that weren’t afraid to put together a quick and dirty special-purpose CNC machine. One of the guys swears that if it requires motion control, he can do almost anything with g-code, and he is someone not afraid to build a special-purpose machine like this. Over the years, he’s made some good profits with his machines and he also gets a fair bit of work from others who see or hear of the machines and come to him to build a machine for their businesses.
I’m always fascinated by these sorts of automation projects. After seeing this little punch press and a few other projects, I wonder if one could create a generalized XY stage that could be clamped to a variety of manual machines to allow them limited CNC functionality. I know Tormach has a very decent business selling CNC mills that immediately get converted for special-purpose tasks like this.
Like what you read on CNCCookbook?
Join 100,000+ CNC'ers! Get our latest blog posts delivered straight to your email inbox once a week for free. Plus, we’ll give you access to some great CNC reference materials including:
- Our Big List of over 200 CNC Tips and Techniques
- Our Free GCode Programming Basics Course
- And more!
Just enter your name and email address below:
100% Privacy: We will never Spam you!
Bob is responsible for the development and implementation of the popular G-Wizard CNC Software. Bob is also the founder of CNCCookbook, the largest CNC-related blog on the Internet.
Specialized machinery and conversion machinery have been around forever. The difference here is that CNC systems are damn cheap these days. Something like that punch press can be done with Ardunios or Raspberry pies, with or without G-Code.
I can remember seeing huge Kerney Trecker mills with most of their guts removed to have stages pushed around by air over oil cylinders, This to achieve an automation goal. Special purpose machines are just far easier to do these days.
You could also adapt, with a bit more work, an arbor press. For punches, you could use the punch and die sets from a manual punch. Or use the entire manual punch and operate the hand lever with a spring-retracted air cylinder to power the punch and away you go.
This one has been stored in my future projects list since 2003 :), it’s a nice little implementation. One nice thing is that a simple tool can be used to make more complex patterns by overlapping the holes. Another option for that specific application would be large holes and some tack welded mesh over them.
I recently made a custom machine for a job doing profile cutting in carbon fibre tubes, I used the rotary from my router (which did not have enough travel for the job) and combined it with a couple of ball screw stages from my “junk” pile and Mach3. Worked like a charm at minimal cost.