Strostkovy
Titanium
- Joined
- Oct 29, 2017
I'm whipping up a general purpose shop press to do the operations our press brakes aren't currently well suited for. This is includes pressing in bearings, dishing plate, bending thick steel, stamping logos, and anything else exceeding 25 tons per foot.
I'm making it out of parts I have.
I have a pair of 5" hydraulic cylinders and a rotary flow divider that should allow the cylinders to pull 50 tons combined. These will pull on two 1-1/2"-4 acme threaded rods, with the ram attached to the nuts. The screws will be spun to rapid travel the ram up and down, and then the cylinders will pull the entire assembly down the rest of the way. The only thing holding ram alignment is these screws in the bushings they rotate and slide in.
The reason to build it like this is that it's easy to make and allows for good positioning accuracy with simple components, and will be less heavy than it would otherwise be.
Is 800 RPM too much for these screws? It will be periodically lubricated but will have two steel nuts per screw to handle the load.
I'm making it out of parts I have.
I have a pair of 5" hydraulic cylinders and a rotary flow divider that should allow the cylinders to pull 50 tons combined. These will pull on two 1-1/2"-4 acme threaded rods, with the ram attached to the nuts. The screws will be spun to rapid travel the ram up and down, and then the cylinders will pull the entire assembly down the rest of the way. The only thing holding ram alignment is these screws in the bushings they rotate and slide in.
The reason to build it like this is that it's easy to make and allows for good positioning accuracy with simple components, and will be less heavy than it would otherwise be.
Is 800 RPM too much for these screws? It will be periodically lubricated but will have two steel nuts per screw to handle the load.