A jack screw

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Project by oldnovice posted 12-31-2015 08:29 PM 2309 views 0 times favorited 11 comments Add to Favorites Watch

This is a jack screw I made for another project that I cannot post as the owner is not ready for prime time.

The wooden pieces are 1/2” MDO with a 1/4”×20 screw, a custom screw traveler, spring (not visible), and an old instrument knob.

This assembly mounts on a T Slot extrusion with the two top 1/4”×20 bolts/nuts and the roller bearing fits into the bearing pocket.

The red line is an indicator for nominal location and the screw/know allows a total +/- .25” adjustment, at 0.05” per turn, from nominal.

I hope to be able to post the entire project soon!

Added two CAD views.

-- "I never met a board I didn't like!"

11 comments so far

View madts's profile


1903 posts in 2793 days

#1 posted 12-31-2015 08:45 PM

Is this for screwing a jack rabbit or for something else?


-- Thor and Odin are still the greatest of Gods.

View oldnovice's profile


7496 posts in 3821 days

#2 posted 12-31-2015 08:55 PM

@ madts, it adjust a roller position.
The roller bearing sits in the bearing pocket.

-- "I never met a board I didn't like!"

View Rob Drown's profile

Rob Drown

808 posts in 4286 days

#3 posted 12-31-2015 09:07 PM

Really nice workmanship. How much lash does it have?

-- The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools. Confucius, 经过艰苦的努力的梦想可以成真

View oldnovice's profile


7496 posts in 3821 days

#4 posted 12-31-2015 09:31 PM

@ Rob Drown, the spring, that is not visible and surrounds the adjustment screw, keeps the lash to a minimum … hopefully!

-- "I never met a board I didn't like!"

View eddie's profile


8565 posts in 3067 days

#5 posted 01-01-2016 02:53 PM

now you got me wondering about the project,thats a fine jack screw ,kinda like a micro adjuster

-- Jesus Is Alright with me

View Picklehead's profile


1053 posts in 2382 days

#6 posted 01-01-2016 03:37 PM

It looks a bit shocked in that front view!

-- Quote from ebay tool listing: " Has nicks and dings wear and tear dust and dirt rust and pitting but in good working condition"

View Jim Bertelson's profile

Jim Bertelson

4267 posts in 3617 days

#7 posted 01-01-2016 04:05 PM

OK, I will wait for the full project. There is no way I am going to make meaningful comments this early in the morning before my second cup of coffee is down. It has a faint resemblance to things I have made and seen, but…........I’ll wait for the full project.

First day in a row of my retirement… today. And I am already making excuses for not doing things…...(-:

-- Jim, Anchorage Alaska

View poopiekat's profile


4498 posts in 4187 days

#8 posted 01-01-2016 05:35 PM

Nice work, intriguing concept!

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

View oldnovice's profile


7496 posts in 3821 days

#9 posted 01-01-2016 06:52 PM

Happy New Year to all!

@ Picklehead yes, it must have been the camera flash that shocked it.

The entire project will/should be posted very soon but I have been asked to keep it “under wraps” until the software is complete!

All I can reveal at this time is that a former colleague of mine spends a great deal of time teaching kids in middle schools, and higher grades, about science, math, physics, engineering. I have done several other projects for him, one of which I posted in 2009 .

Somtime ago he asked me to build a □□□□□□□□ project that I have been working on/off for well over two years.

-- "I never met a board I didn't like!"

View johnhutchinson's profile


1243 posts in 2082 days

#10 posted 01-01-2016 09:24 PM

Looks cool !!!
I have no idea what it is, but I’m sure I need one. :-)

-- John - Central Ohio - "too much is never enough"

View WistysWoodWorkingWonders's profile


12785 posts in 3610 days

#11 posted 01-03-2016 06:45 AM

cool…....... so far, lol – can’t wait to see the rest of it once the full project is done.
great job building this (and some suspense)

-- New Project = New Tool... it's just the way it is, don't fight it... :)

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