SSQA fork build

   / SSQA fork build
  • Thread Starter
#22  
More progress. Welded the blocks to the forks and next up will be the vertical mill.
 

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   / SSQA fork build #23  
You could do a single cylinder and have a cam lever, no chains or rollers.
 
   / SSQA fork build #25  
Rack and pinion would work too. You'd need another bar to keep them from binding, but a little hydraulic motor would turn that pinion with ease and speed. Put the motor in the middle between the SSQA pads.
 
   / SSQA fork build
  • Thread Starter
#26  
Rack and pinion would work too. You'd need another bar to keep them from binding, but a little hydraulic motor would turn that pinion with ease and speed. Put the motor in the middle between the SSQA pads.

And I was just finishing up my redesign using chains and sprockets! Now you've got the gears and racks spinning in my head. How about a hydraulic motor running a RH/LH leadscrew? I think I saw this setup on a huge old forklift somewhere.
 
   / SSQA fork build #27  
I think the R&P would be easier to keep clean enough to not jam (looser tolerances wouldn't hinder function). Screws and dirt make me nervous.
 
   / SSQA fork build #28  
Good point. How do they do it on forklifts?

I don't think I've ever seen a forklift with hydraulically adjusted forks spacing but if they exist, I'm sure they have 2 cylinders. Forklifts aren't cheap so they're not likely to try to save the money on 1 cylinder and control if they have that feature.
 
   / SSQA fork build
  • Thread Starter
#29  
I don't think I've ever seen a forklift with hydraulically adjusted forks spacing but if they exist, I'm sure they have 2 cylinders. Forklifts aren't cheap so they're not likely to try to save the money on 1 cylinder and control if they have that feature.

This forklift has it and yes, it is run by two cylinders. The forks are supported on the top and bottom where they slide by fairly wide supports to prevent binding, which is my biggest concern with my design. I'm guessing this forklift uses a flow divider between the two cylinders, but I don't know for sure.
 

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   / SSQA fork build #30  
I've used several hydraulically adjusted fork carriages, I just never bothered to look at how they did it. Usually the whole frame was caked in grease.
 

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