Introduction: Making a Set of Third Hands: Welding Fixtures!
Welding is fun! But sometimes you just need a few helping hands to
hold your work while you weld. This Instructable goes over how I made
my third hands: welding fixtures.
Thanks goes out to schip666's Instructable
for giving me some basic ideas on how to fabricate my fixture.
I tried to simplify my design as well as make it versatile and capable
of clamping objects at any angle.
Things I used:
weldable steel rod
nuts and bolts
and of course...
TechShop San Jose =)
Step 1: Prep the Materials
First I cut my steel tubing to roughly 1.5" segments with the Cold Saw. I made
two third hands and needed two joints for each one. Each joint needs two tube
segments, and each third hand needed two joints for a total of 8 tube segments.
I then used the drill press to cut a single hole into each tube, large enough
for the bolts to fit through.
The weldable rod I cut into two longer pieces for the main stem of each third
hand. I also used the bench grinder to put a bit of a beveled edge on the rods
so I had room to fill when welding. Then I cut four slightly shorter rods as
the adjustable arms.
Cut my steel plate to make two nice little bases.
Cut some smaller steel rod to about 2" semgents, to be used later for making
wings on the bolts.
Using the SandBlaster, I removed some of the coating on the C-clamps to make
sure I got a good connection when welding those later.
Step 2: Welding!!
Starting with the easy welds...
attached the large rods to the plates to make the main stem with base.
attached the C-clamps to some of the smaller rods
attached the small rods to the bolts, so the they can be easily hand tightened
then the more important welds...
the main part of this whole project are the adjustable joints that hold
These were welded together in two stages. First I welded the nuts to each
of the tubing segments. And Secondly welded those segments to one another.
Step 3: Clean Up
Based on the quality of your welds this step could either be non-existent/
very minimal to very difficult and time consuming. Luckily I only had a
few minor issues to clean up.
Using a round file I got rid of any buggers on this inside of the tubing
until the rods could easily slide through.
With a tap (matching the threads of the nuts and bolts) I cleaned up and
buggers that got into the nut.
Step 4: Assemble and Use
Slide all the rods through the tubing and use the winged bolts as set screws.
Now clamping work pieces at any angle is a breeze. =D