Adjustable Hold Down Bed

discussion of design changes / improvements / suggestions
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FlyingSpaghetti
Posts: 6
Joined: Tue Apr 17, 2012 12:27 am

Adjustable Hold Down Bed

Post by FlyingSpaghetti » Fri Aug 10, 2012 12:05 am

Here are some pictures of the hold down bed I built for my ShapeOko. My goal was to make a flexible hold down bed that had a replaceable waste board. I did not want to have to cut any special grooves or slots into the waste board. Those just make it a hassle to create a new one. The design I came up with allows for a replaceable 18"x15" waste board that needs no special machining. The hold down rails are adjustable and can be used to clamp the work piece while holding it down to the waste board.

I used two of these T-Track rails and cut them to length.
http://www.woodcraft.com/product/200391 ... ength.aspx
Bed without waste board.jpg
Bed without waste board.jpg (197.2 KiB) Viewed 6367 times
Bed with waste board.jpg
Bed with waste board.jpg (188.23 KiB) Viewed 6367 times
Bed with ShapeOko 1.jpg
Bed with ShapeOko 1.jpg (192.54 KiB) Viewed 6367 times

FlyingSpaghetti
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Joined: Tue Apr 17, 2012 12:27 am

Re: Adjustable Hold Down Bed

Post by FlyingSpaghetti » Fri Aug 10, 2012 12:08 am

Here is the design file if anyone is interested
Clampbed.pdf
(6.69 KiB) Downloaded 270 times

Improbable Construct
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Re: Adjustable Hold Down Bed

Post by Improbable Construct » Fri Aug 10, 2012 1:52 am

Looks nice. Good for material positioning too. Set it up once and you can swap in new material without doing a whole new setup.
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marcohess
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Location: Adelaide - South Australia

Re: Adjustable Hold Down Bed

Post by marcohess » Fri Aug 10, 2012 3:09 am

I like it how it gives you the ability to slide in larger stock underneath the end plates.
ShapeOko #290

phlamingo
Posts: 66
Joined: Fri May 25, 2012 10:42 pm

Re: Adjustable Hold Down Bed

Post by phlamingo » Fri Aug 10, 2012 2:48 pm

Simple and elegant.

You might run into issues with thinner stock, which might bow upward or (in extreme cases) slide under the rails.

But for the majority of jobs, this is very nice.

- Phlamingo
---
ShapeOko Batch 2, Number 571, dual-Y motors, Y belts outside, odd anchors. Not operational at the moment: needs rewiring.

Tom Smith
Posts: 297
Joined: Mon Apr 09, 2012 9:55 pm
Location: North Vancouver, British Columbia

Re: Adjustable Hold Down Bed

Post by Tom Smith » Fri Aug 10, 2012 3:32 pm

Wow, that looks great - it can even provide some edge clamping, I assume, as well as the surface clamping. Very nice!

Tom
_______________
ShapeOko1 191

FlyingSpaghetti
Posts: 6
Joined: Tue Apr 17, 2012 12:27 am

Re: Adjustable Hold Down Bed

Post by FlyingSpaghetti » Fri Aug 10, 2012 7:34 pm

phlamingo wrote:Simple and elegant.

You might run into issues with thinner stock, which might bow upward or (in extreme cases) slide under the rails.

But for the majority of jobs, this is very nice.

- Phlamingo
The rails are clamped down to the waste board. You might have problems with extremely thin stock but other wise it should be able to provide some edge clamping as well as the hold down.

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