The Bernina B740 is a sewing machine that goes "whirrr" and sometimes "thunk thunk thunk thunk thunk". It can sew different kinds of truck and animals, including a turtle:
You can not order replacement parts for the B740.
Description
Description
Related Objects
Related Objects
- Mentioned Here
- T13689: A Considered Review: 3D Printing
Event Timeline
Comment Actions
Turny Thing
See also T13689.
The B740 has a turny thing. It looks almost like this:
The outside is perfectly smooth to make it difficult to turn. If you turn it too hard, oof:
This wheel appears to be sturdier and is easier to turn:
Comment Actions
String Shelf
When sewing, you need a lot of different string. Bernina sells a Bernina String Shelf.
They do not list the price, but these shelves sell on eBay for about $100.
This is just a shelf for string and costs $100. It seems like it should be possible to build a shelf for string for more like $75 in materials and 40 hours of labor.
String Shelf Shelf
The sewing machine sits inside a Very Nice Table that I don't want to drive any screws into, so I started by making a String Shelf Shelf for the String Shelf to rest on. This is a sort of clamp that can squeeze a ~120mm strip of tabletop to the right of the machine:
The left part is printed twice. The actual shelf is a piece of plywood that goes between the left parts and the middle part, which I drove some M5 threaded inserts into. The final dimension of the plywood is 120mm x 130mm and I should probably just have printed this part instead of making four different sub-assemblies, but I haven't used heat-set inserts yet and I'm not sure if they're trustworthy or not.
Overcome with hubris, I hand-drilled the holes in the far end of the plywood to attach the clamping face and the bit wandered enough to throw the piece significantly out of square. I needed to reprint it anyway since the clamping action wasn't quite right, so I measured where the holes ended up and adjusted them in the model -- the one on the left went down 0.6mm, and the two on the right went up 0.5mm. Then I printed the asymmetrical "as-built" piece with the other adjustments. This felt horrible but worked well and fixed the squareness issue.
I put some of this CatTongue Grip Tape on the inner surfaces of the clamp and it seem to work pretty well: when you wiggle it, the table moves.
String Shelf Stick
I'm using 24" T-Track to create a vertical rail for string. It's bolted to the String Shelf Shelf on the bottom, and capped on the top since the aluminum corners can be a bit sharp/dangerous:
