Thank you Tony.
At that spring rate, about 20 lbs at max compression, the ram tracks the cam pretty well up to about 400 RPM, greater than that, there is some bounce, I have run it up to about 700 RPM and it was still working but a bit noisy. Per the specs, the actual operational speed is 360 RPM, but I did try to design for double that. In actual use, I suspect that it will be operated at < 200 RPM. There is a return spring in the front cover/bearing support that was not installed for the video. It's rate is about double the spring I was using in the test. I just grabbed something out of the spring box for testing. There is also a return spring in the tooling, but I suspect that it's rate will have to be increased. With a 4200 oz-in motor, I'm really just using the brute force method. There is one other small issue, I somehow made an error in the cam design. It was supposed to have a lift of 0.328 and I wound up with 0.480 lift after the third iteration. I didn't catch it before I built it, I don't know how I missed that one. The customer wanted 0.750 so I guess that's a compromise.
I also have some concerns about the lateral motion. Ideally the ram should ride in bearings, or actual ways. The design challenge was not having enough meat in that area to install bearings. When the customer specifies a HF arbor press, and won't budge off of that, well, he gets what he gets. I suspect that the service life of this one is not more than a couple of months. In terms of the number of strokes, this will see more use in an hour, than the average arbor press would see in a lifetime.
I have a new press frame designed that the power head will bolt right into when this frame goes south.
