It's has been about one year and five month since I started a build on this forum for a CNC router, now it's been finished for a good while now, and it's a lot better than I thought possible, it has also been a lot of ups and downs right from about the first post when I was told to scrap my design ( I nearly scrapped it altogether ) but I did start again and I'm very pleased how it has turnout, also when I set my budget for the build I added my usually 30% for the things I never thought of. Well it cost a lot more than I thought. But now I cannot believe but I going to start a new build this time for a CNC CO2 40 watt laser. Now I have only done some sketches no CAD. Drawings, but I do have a question ? Before I start drawing in CAD.
I was having a look at some CNC lasers online, and I noticed that on the gantry I could only see one linear guide rail HGR type, and the laser head is bolted on to the bearing through a plate. Now the reason I'm asking is I need to cut down the weight of the gantry as I have been thinking of designing mine with two SBR12 rails and three lumps of 10mm aluminium bolted on to the four pillow blocks, then the laser head is bolted to that. The main concern is the weight of all this flying about when raster engraving, this is why I am asking, is having one linear guide rail of the HGR type be OK or do you need two, and if you only need one should it be a HGR15 or HGR20 or what size would you use, it would be 700mm length?
Once I start to draw it up in CAD I will start another build on the machine building thread. Mike.