I am really pleased with how the SINTRA machined, though it meant standing over the work table with a vacuum during the entire cut. A vacuum attachment would alleviate this...
Thursday, January 9, 2014
CNC parts (finally making useful stuff)
Here are some pictures of a case that I machined from SINTRA (PVC sheet). It is for my Raspberry Pi. I designed the part in Sketchup, then used an export plugin to send it as an STL file to CamBam, where I created the toolpaths.
CNC WINTER UPDATE
Time for an update on things in the workshop. It's been months since i checked in but lots of stuff is always happening.
I've made good progress on the CNC machine. Originally, it had 5/16 allthread rods for the linerar motion, but I recently swapped out the X and Y axes to 3/8"-12 ACME screw, from ENCO. Their black oil-finish acme screws are on perpetual sale, so I ordered some for $3.99 in 36" lengths. The X-axis is 36" long and the Y- is about 28" This left me some scrap, but I decided to leave the Z-axis as allthread. Instead I used the leftover to make a tap so that I could cut thread into UHMW plastic to make the leadscrew nuts. This worked out pretty well, I need to take some pictures of that process.
After watching things run, I decided that the Z-axis carriage was not stable enough, brass bushings that were just press-fit in place could fall out, etc. I have been working on a new design for the Z-axis carriage that I will attach soon.
And for more showoff, a part that I made. This is going to be a toolholder for a Rotozip to replace the Dremel:
I've made good progress on the CNC machine. Originally, it had 5/16 allthread rods for the linerar motion, but I recently swapped out the X and Y axes to 3/8"-12 ACME screw, from ENCO. Their black oil-finish acme screws are on perpetual sale, so I ordered some for $3.99 in 36" lengths. The X-axis is 36" long and the Y- is about 28" This left me some scrap, but I decided to leave the Z-axis as allthread. Instead I used the leftover to make a tap so that I could cut thread into UHMW plastic to make the leadscrew nuts. This worked out pretty well, I need to take some pictures of that process.
After watching things run, I decided that the Z-axis carriage was not stable enough, brass bushings that were just press-fit in place could fall out, etc. I have been working on a new design for the Z-axis carriage that I will attach soon.
And for more showoff, a part that I made. This is going to be a toolholder for a Rotozip to replace the Dremel:
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