Author Topic: Work table  (Read 7757 times)

Xylotica

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Work table
« on: November 10, 2015, 11:36:16 PM »
I just watched a video about strong hand tools : https://www.youtube.com/watch?v=wbHRrcNED58
This gave me the idea to make a 25mm thick steel laser-cut table with ø28 holes to place my fixtures.
It could have a pie-slice (76°) shape to follow the robot's work area.
With 3 such tables, it would cover the entire angular scope of axis 1.

Comments ?

Johannes @ Robots in Architecture

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Re: Work table
« Reply #1 on: November 11, 2015, 08:16:30 AM »
Hmmm... You lose quite a bit of material, but the looks are definitely nice! You can get very stable welding tables that work for milling (also with holes for workpiece holders etc.) for less than 1000EUR - but then of course only in standard, rectangular sizes.
In general with robots, adjusting the height of a table is useful to avoid singularities etc - but of course a height-adjustable table is less stable than a fixed table, so it's again a tradeoff.

Best,
Johannes

Xylotica

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Re: Work table
« Reply #2 on: November 11, 2015, 11:14:46 AM »
Hi Johannes,

I optimized my design for a 1500x3000mm sheet, and used 72° angles so that it could eventually go full circle on a future robot with bigger Axis 1 angular range.
Less than 1000 € ? Hey, that's a good deal ! Any links ?
I had a quote for a 1000x2000mm table with a ø16 holes grid and a few holders for 3000€ VAT included...

I plan to go for a ø28 hole grid so that I can use Bessey or similar holders.
My local laser cutter guy can't cut 25mm thick steel which is required for ø28 fastening holes.

I thought I'd just use two 6mm thick plates with an array of 13mm wide spacers ; something similar to this : https://www.youtube.com/watch?v=31L4VTfFH1A

Cheers,

Johannes @ Robots in Architecture

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Re: Work table
« Reply #3 on: November 11, 2015, 03:35:16 PM »
Hello,

I believe that's the manufacturer, we bought it through a local company: https://www.siegmund.com/en-us
To be honest, I still haven't managed to find the time to set it up, as the project we bought it for got delayed... ;)

Best,
Johannes

Xylotica

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Re: Work table
« Reply #4 on: November 29, 2015, 08:57:11 PM »
It turns out that laser cutting thick plates is not going to give me the right tolerance for the holes, and that welding thin plates will likely warp them.
Therefor, I am going for a non-welded assembly with a plywood spacer.

Let's see how that goes...