Author Topic: Fireitup Fabs a Fab Table  (Read 314 times)

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fireitup

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Fireitup Fabs a Fab Table
« on: Nov 29, 2018, 04:23:35 AM »
So i got this little welder to start doing some rust repair and maybe build a bumper one day.

Untitled

I have near to zero storage space and a carport attached to my house for my truck to live in.  This is also where I do all my work.  I was dinking around in the driveway practicing some beads when i came up with this idea for a removable table top for my foldable saw horses.  Here are said saw horses.

Untitled

I figure I could design the table to sit on top of the 2x4s and bolt through them to secure it in place.  When I am done I can unbolt the table top and hang it.  Saw horses fold away as well.

I am not a mechanical engineer but I know my way around Pro/E and Autodesk Fusion pretty well.  Both are parametric modeling software.  Here is my first workable design that I am happy with.

3_ x 1_ x 11ga tube v11 img1

Design consists of 8, 3' segments of 3"x1" 11g steel tubing strapped together by 2 lengths of 1"x1" square tubing.
All segments spaced 1.5" apart.
2, 0.25" holes drilled at either end will be used to bolt the table to the sawhorses.

3_ x 1_ x 11ga tube v11

The second segment on one side will have tabs welded on so that it can be moved.  One configuration will keep the spacing the same as the other segments. Second configuration will allow it to butt up against the end segment, allowing for my bench vise to be bolted to 4, 0.5" drilled holes.

The table as designed is 36" wide x 34.5" long.

 :flamer:
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OVRAROK

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Re: Fireitup Fabs a Fab Table
« Reply #1 on: Nov 29, 2018, 10:44:53 AM »
 :popcorn:
even the most primitive society has an intimate respect for the insane

fireitup [OP]

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Re: Fireitup Fabs a Fab Table
« Reply #2 on: Nov 30, 2018, 03:42:25 AM »
Generated a drawing showing all dimensions.  A little busy but it is all there, i think.

welding_dwg

Google Drive link to download the PDF: http://bit.ly/2FMUvTG
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fireitup [OP]

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Re: Fireitup Fabs a Fab Table
« Reply #3 on: Dec 01, 2018, 12:51:25 PM »
Called around and none of the steel suppliers in town seem to stock 11ga tube in 3"x1".  Most stock 14ga.  Not what I was going for initially so I went ahead and modeled the welds and changed the tube to 14ga to run a static load study.

Absolutely no need to do this probably, but what the heck. Lets nerd out for a bit.

Assuming that the table is constrained at the end tubes (mostly true)

14ga-constraints

Assuming the table is designed to support ~562lb (2500N) spread across the remaining tube sections

14ga-loads

Solving predicts a maximum deflection of 0.68mm in the center (Image shows deflection scaled up 0.5x...)

14ga-displacement

Also, looking at the safety factor analysis shows that the welds on the constrained section could fail at 1.05x the designed load (527.5lb).

safety_factor

14ga-safety-2

This seems like a reasonable conclusion, since the constraints prevent the end tube sections from flexing at all.  The square tube support flexing with the other tube sections wants to tear away from the pieces that cant move.  Not too worried about this, since a) I am not building a pedestrian bridge or something and b) the welds I modeled are actually pretty dinky.  Ill do a double pass there just in case I ever need to set a Chevy Big Block V8 on it.  Probably never going to happen though...

I think i am safe to proceed with 14ga.  Lighter and cheaper!

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fireitup [OP]

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Re: Fireitup Fabs a Fab Table
« Reply #4 on: Dec 07, 2018, 09:13:36 AM »
Picked up the stock for this today. $100 cut from the supplier. 12 cuts.

Consisted of 1 24 1x3 tube and 1 24 1x1 tube. All 14ga.

Never purchased steel stock before so chime in if you think I was ripped off!



Will post mock up pics this weekend.


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fireitup [OP]

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Re: Fireitup Fabs a Fab Table
« Reply #5 on: Dec 07, 2018, 07:15:14 PM »
A little more organized. This is the material that will make up the table.




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fireitup [OP]

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Re: Fireitup Fabs a Fab Table
« Reply #6 on: Dec 09, 2018, 08:32:35 AM »
Mocked up. Everything looks pretty good. Most of the cuts from the steel supplier were 36 1/16- 36 1/8. That left one guy (marked with the angle magnet) around 35 5/8. Ill make that piece the removable one.



Overall pleased with the mock up. Need to invest in a bandsaw if I want tighter tolerances in the future.

Next up Ill want to check for level and squareness before doing any welding.


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OVRAROK

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Re: Fireitup Fabs a Fab Table
« Reply #7 on: Dec 09, 2018, 09:48:22 AM »
Looks great  :thumbs: 
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kneedownnate

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Re: Fireitup Fabs a Fab Table
« Reply #8 on: Dec 09, 2018, 07:27:20 PM »
Horizontal/vertical saw if youre gonna be cutting a lot of metal in the future
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