- Joined
- Dec 23, 2019
- Messages
- 1,138
There's the heart of it:
I'm almost ready to start making some actual drawings having ironed out a few silly quirks.
One thing I really don't get it the use of ball bearings in the pin joints attaching the crank arm to the frame and ram. Bearings don't like running over a small rotation angle and back again, it tends to wear them strangely. Good old bronze bushes seem like a better choice here, much as it's something else to oil. The pockets with shoulders on the outside are also going to make it hell to machine accurately. Hopefully this shows it clearly:
Not dimensioned as I don't want to run into any copyright issues on an open forum, but you get the idea.
I've not even looked at the slideways, feeds, table and other bits and pieces in detail yet - that's a whole other project!
I'm almost ready to start making some actual drawings having ironed out a few silly quirks.
One thing I really don't get it the use of ball bearings in the pin joints attaching the crank arm to the frame and ram. Bearings don't like running over a small rotation angle and back again, it tends to wear them strangely. Good old bronze bushes seem like a better choice here, much as it's something else to oil. The pockets with shoulders on the outside are also going to make it hell to machine accurately. Hopefully this shows it clearly:
Not dimensioned as I don't want to run into any copyright issues on an open forum, but you get the idea.
I've not even looked at the slideways, feeds, table and other bits and pieces in detail yet - that's a whole other project!