In 2010, I built this bench and included my first ever leg vise using a 1-8 threaded rod for the screw. This bench leg contains two nuts to both suspend the screw and resist the axial clamping force. My next project is to retrofit this vise with a new screw and to eliminate the parallel guide.
I've decided to retrofit this vise with an X-cross linkage and a 1-5 Acme screw. The bench leg front contained a hex nut that is to be replaced by a radial ball bearing. First step was to make a centering pilot and a drill guide for the bearing recess. Here is the centering pilot in the existing hole:
and the drill guide clamped ready for the pilot to be removed:
Ready for drilling
The bearing installed with a retaining ring (note that I drilled the hole a bit too deep). A 1-7/8" internal retaining ring works without cutting a groove. The Acme screw slides on the inner race while the bearing stabilizes and supports the chop.
Next step is to mount an Acme nut on the back of the leg. My preference is a square brass Acme nut but I only had a steel hex nut. I opted for a nut block instead of trying to chisel a hex recess into the existing leg. This side goes against the back of the bench leg:
and here is the back side of the nut block where the screw exits:
Here is the nut block installed on the back of the front leg:
At this point, the chop is supported and the screw works. The chop is being reused. The wooden hand wheel is from another leg vise. A self-aligning bearing is pressed into the chop and that bearing serves as a garter also.
Next step is to make the X-cross linkage and then install it. Making the X-cross starts here: https://ncwoodworker.net/forums/index.php?threads/leg-vise-retrofit-2.70483/
I've decided to retrofit this vise with an X-cross linkage and a 1-5 Acme screw. The bench leg front contained a hex nut that is to be replaced by a radial ball bearing. First step was to make a centering pilot and a drill guide for the bearing recess. Here is the centering pilot in the existing hole:
and the drill guide clamped ready for the pilot to be removed:
Ready for drilling
The bearing installed with a retaining ring (note that I drilled the hole a bit too deep). A 1-7/8" internal retaining ring works without cutting a groove. The Acme screw slides on the inner race while the bearing stabilizes and supports the chop.
Next step is to mount an Acme nut on the back of the leg. My preference is a square brass Acme nut but I only had a steel hex nut. I opted for a nut block instead of trying to chisel a hex recess into the existing leg. This side goes against the back of the bench leg:
and here is the back side of the nut block where the screw exits:
Here is the nut block installed on the back of the front leg:
At this point, the chop is supported and the screw works. The chop is being reused. The wooden hand wheel is from another leg vise. A self-aligning bearing is pressed into the chop and that bearing serves as a garter also.
Next step is to make the X-cross linkage and then install it. Making the X-cross starts here: https://ncwoodworker.net/forums/index.php?threads/leg-vise-retrofit-2.70483/
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