Size isn’t always the most important thing when selecting a CNC machine. For example, I have a small and inexpensive Chinese 1610 machine, which has a bed 160mm wide and 100mm deep. For the kind of Maker things I do the small size isn’t a problem: in fact it works quite well in my equally small work zone. However, for LASER-cutting I wanted a little more distance along the Y-axis so I looked into how to simply modify the machine.
Obviously I could just replace some side frame parts, along with a couple of guide rods and a lead-screw, making the plan area whatever I’d like. However, that seemed like overkill for my needs so I thought a little more and came up with a very inexpensive way to up my cutting size to 160mm by 140mm. An extra 40mm doesn’t sound much, but for a lot of projects it makes a big difference. And, all it took was a bit of 3D printing filament and ten new hold-down bolts. You can see the results in the photo below.
The risers just raise the bed up a few millimeters but, together with moving the guide rod slider blocks in by one slot, they allow the bed to ride over the guide rod mounts. That riding over is what gives the extra 40mm. I decided that 20mm of overhang front and back during cutting wouldn’t be a problem, which saves the cost of buying a new 160x100mm 2020-section aluminium bed. The original bolts used to mount the bed were 10mm long, so I replaced them with 16mm ones which fitted perfectly. I also took the opportunity to replace the drop-in T-nuts with slide in ones, which gives me more confidence that the bed is properly fixed down. You can see how I fitted the risers, and moved the blocks, in the photo below.