|Forum: Work in progress|
| Topic: Fitting one part inside another (tolerances)?|
|Re: Fitting one part inside another (tolerances)? [message #136698 is a reply to message #134358 ] Wed, 10 February 2016 04:37 UTC
Another experiment with a different fastener design and tighter clearances. The threads didn't stay snugly together very well probably in part because the 0.2mm clearance everywhere was to loose. |
Instead of threads this assembly uses a twist lock action. There are three 3mm dia cylindrical tabs that rotate into slots over 0.1mm bumps at the entrance. Going over the bumps is -0.1mm clearance. Then at rest, locked into the slot there is 0mm clearance. It snapped into place but if i pushed the two parts together i could rotate the tabs without feeling any bump.
So to lock the red core part into the grey tube in my OP there will be 4 larger 3x6mm tabs that will similarly twist lock into the grey tube. Kind of like what is drawn onto the parts in the 2nd pic.
Here are pics of the drawn assembly and the printed result. Can't use 0 thickness edges like were printed on the end of the outer cylinder ;-)
The twist lock action at the other end of the outer cylinder are drawn with a 0.2mm space between the tab and the cylinder and i can flex them with a pencil point, but they're likely to fragile.
| Topic: Custom Toyota Emblem for a gtfour|