I sometimes have to press premade registers and pins into molds that are rather to large to hold flat easily on the arbor press or my shop press. Also the location can be awkward. I was thinking it might be useful to setup a small HEAVY table with some rails to move the bridge of a hydraulic press back and forth for this purpose. I have seen presses that will allow for side to side movement of the ram. They roll on bearings, but when activated a large flange is pressed against the bottom of the bridge.
Ok... tell me everything that is stupid about this idea.... Well besides the fact that I don't have to do it that often so its kind of like swatting flies with a 2 x 4.
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A gantry crane is a fine answer to lifting problems as it makes you Superman, able to lift great weights and fly them through the air. Their problems for me are that they are expensive, bulky and unable to operate off level pavement.
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For temporary hoisting and moving loads under 1/2 ton I rig two 8' sections of (salvaged) channel iron overhead and run HF beam trolleys #97392 on them with chain hoists. Individually the channels are about half the weight of one comparable Wide Flange beam, easy for two people to lift and manageable for one with stepladder aid. I set up and took down the 16', 200 Lb gantry track by myself by attaching boat trailer winches to the supporting tripod legs with muffler clamps.
The bolts that join the channel webs at the ends provide several possibilities for leveling hangers, such as turnbuckles or long forged eye bolts. Depending on length and load the channels may need intermediate bolts and spacers connecting the webs to prevent shear and lateral deflection. A single W section beam is better for a permanent installation, but more difficult to erect and suspend. The channel requires only a few bolt holes through the web. I used a battery drill and a Portalign.
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Two hoists could lift a pair of long angle irons under the sides of the mold, held in place with threaded rod. The rigid slings at the ends could be slotted angle which allow width changes and suspend the mold from above its center of gravity. Web slings might let the load twist and fall. As long as you can jack up one side of the mold to remove or place the angle irons this should allow you to shift the mold in and out of the press and set it on the bed. The same rig works even better if the mold has corner lift eyes.
The wheels on the 97392 need to be turned a little smaller to fit into 3" x
4.1 channel. They fit as-is in 4" (high) x 5.4 (Lbs per foot) channel. The trolley is easier to assemble onto the beam if you drill the lower corners for long bolts or threaded rod that holds the sides in place while fitting the hanger rod and spacers.
I use a trolley and hoist at each end to move logs into or out of the storage shed, thus I stay outside the stack, clear of danger if logs shift sideways. Once the log is more than half way out I chain the outer end to the overhead track and move the trolley and hoist to the center so the log can be swung a quarter turn onto the sawmill bed. The overhead track is permanent within the shed, temporary outside it.
I described this as if starting from scratch. My second 3" channel trolley is a shop made mount for the HF 1300 Lb electric hoist that lets me stay even further from the load than a manual chain fall allows. When working out back away from power it takes a centered eye bolt to hang a lever chain hoist. The electric hoist starts with a jolt that visibly deflects the track, so I've considerably derated its load capacity. A manual hoist can position much more precisely.
Good luck.