dfkrug
Super Member
- Joined
- Feb 3, 2004
- Messages
- 7,224
- Location
- Santa Cruz Mtns, CA
- Tractor
- 05 Kioti CK30HST w/ Prairie Dog backhoe, XN08 mini-X
This is an interesting idea that I haven't seen before, and sounds like a neat
idea. What valve did you use and got a pic or drawing of the plumbing layout?
It is all explained in my hyd thumb thread:
http://www.tractorbynet.com/forums/build-yourself/125912-custom-hydraulic-backhoe-thumb.html
My 4-in-1 is also plumbed this way using the identical valve. That setup has also worked flawlessly
for years in the real world.
I did it this way not just to save money. (It is a lot less, however.) I wanted to minimize hoses that
are in harm's way, attached to the side of the boom and dipper. A small, 1-spool solenoid valve
can be remotely mounted, with 2-spoolers (full diverter) are much larger.
Would this eliminate the problem of one overpowering the other and work kind of like a dual lid setup on a grapple bucket
where one will contact the item, stop until the other makes contact then tighten together?
The problem is not eliminated; I view it as a design challenge to account for, just like using bigger
than 1" rods on the thumb cyl minimizes rod buckling. The only challenge that is eliminated is
that there are no reaction forces pushing on the bkt by the thumb. (Bkt cyls are not usually
protected by OEM RVs in the stack.) The 3000psi limit of my Hydraforce valve was my biggest
design constraint.