ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
I am starting a thread where you can post a photo of your beautiful scrap. This means, you spent some time making a nice part, but had to toss it in the trash because a critical dimension was wrong. So next time that this happens, take a photo and post it here. Maybe we can learn from your mistake.
This is my latest:
I needed some keys that were 14.000mm wide on one side and 12.000mm wide on the other, parallel and centered to within a few microns. So I rough milled a piece of tool steel 150mm (6" long) about 0.2mm oversize, used a slitting saw to make a clearance groove, then ground the four important surfaces. The plan was to then drill and countersink the mounting holes, slice into four keys, harden and temper, and then do the final grinding. Problem is, I ground off 0.2mm too much
. The part is exactly 13.832 / 11.832 wide. In the trash bin it goes.
Lesson learned: even though the part is oversize, watch the $%^& dimensions while grinding!
This is my latest:
I needed some keys that were 14.000mm wide on one side and 12.000mm wide on the other, parallel and centered to within a few microns. So I rough milled a piece of tool steel 150mm (6" long) about 0.2mm oversize, used a slitting saw to make a clearance groove, then ground the four important surfaces. The plan was to then drill and countersink the mounting holes, slice into four keys, harden and temper, and then do the final grinding. Problem is, I ground off 0.2mm too much
. The part is exactly 13.832 / 11.832 wide. In the trash bin it goes.Lesson learned: even though the part is oversize, watch the $%^& dimensions while grinding!
